[Debug][ErrorHandler] fix operator precedence

The ErrorHandler's job includes handling out of memory (OOM) exceptions,
therefore it is imoprtant that that feature works. In the current state,
when handling OOM exceptions, the error handler produces an OOM error
itself, because the old 10k reserve is apparently not enough anymore.
To mitigate that, the reserved memory gets bumped to 32k (which is enouogh).

.gitattributes

@@ -0,0 +1,4 @@
+/Tests export-ignore
+/phpunit.xml.dist export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore

BufferingLogger.php

@@ -13,24 +13,31 @@ namespace Symfony\Component\Debug;
 
 use Psr\Log\AbstractLogger;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', BufferingLogger::class, \Symfony\Component\ErrorHandler\BufferingLogger::class), \E_USER_DEPRECATED);
+
 /**
  * A buffering logger that stacks logs for later.
  *
  * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\BufferingLogger instead.
  */
 class BufferingLogger extends AbstractLogger
 {
-    private $logs = array();
+    private $logs = [];
 
-    public function log($level, $message, array $context = array())
+    /**
+     * @return void
+     */
+    public function log($level, $message, array $context = [])
     {
-        $this->logs[] = array($level, $message, $context);
+        $this->logs[] = [$level, $message, $context];
     }
 
     public function cleanLogs()
     {
         $logs = $this->logs;
-        $this->logs = array();
+        $this->logs = [];
 
         return $logs;
     }

CHANGELOG.md

@@ -1,46 +1,75 @@
 CHANGELOG
 =========
 
+4.4.0
+-----
+
+ * deprecated `FlattenException`, use the `FlattenException` of the `ErrorHandler` component
+ * deprecated the whole component in favor of the `ErrorHandler` component
+
+4.3.0
+-----
+
+ * made the `ErrorHandler` and `ExceptionHandler` classes final
+ * added `Exception\FlattenException::getAsString` and
+   `Exception\FlattenException::getTraceAsString` to increase compatibility to php
+   exception objects
+
+4.0.0
+-----
+
+ * removed the symfony_debug extension
+ * removed `ContextErrorException`
+
+3.4.0
+-----
+
+ * deprecated `ErrorHandler::stackErrors()` and `ErrorHandler::unstackErrors()`
+
+3.3.0
+-----
+
+ * deprecated the `ContextErrorException` class: use \ErrorException directly now
+
 3.2.0
 -----
 
-* `FlattenException::getTrace()` now returns additional type descriptions
-  `integer` and `float`.
-
+ * `FlattenException::getTrace()` now returns additional type descriptions
+   `integer` and `float`.
 
 3.0.0
 -----
 
-* removed classes, methods and interfaces deprecated in 2.x
+ * removed classes, methods and interfaces deprecated in 2.x
 
 2.8.0
 -----
 
-* added BufferingLogger for errors that happen before a proper logger is configured
-* allow throwing from `__toString()` with `return trigger_error($e, E_USER_ERROR);`
-* deprecate ExceptionHandler::createResponse
+ * added BufferingLogger for errors that happen before a proper logger is configured
+ * allow throwing from `__toString()` with `return trigger_error($e, E_USER_ERROR);`
+ * deprecate ExceptionHandler::createResponse
 
 2.7.0
 -----
 
-* added deprecations checking for parent interfaces/classes to DebugClassLoader
-* added ZTS support to symfony_debug extension
-* added symfony_debug_backtrace() to symfony_debug extension
-  to track the backtrace of fatal errors
+ * added deprecations checking for parent interfaces/classes to DebugClassLoader
+ * added ZTS support to symfony_debug extension
+ * added symfony_debug_backtrace() to symfony_debug extension
+   to track the backtrace of fatal errors
 
 2.6.0
 -----
 
-* generalized ErrorHandler and ExceptionHandler,
-  with some new methods and others deprecated
-* enhanced error messages for uncaught exceptions
+ * generalized ErrorHandler and ExceptionHandler,
+   with some new methods and others deprecated
+ * enhanced error messages for uncaught exceptions
 
 2.5.0
 -----
 
-* added ExceptionHandler::setHandler()
-* added UndefinedMethodFatalErrorHandler
-* deprecated DummyException
+ * added ExceptionHandler::setHandler()
+ * added UndefinedMethodFatalErrorHandler
+ * deprecated DummyException
 
 2.4.0
 -----

Debug.php

@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Debug;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', Debug::class, \Symfony\Component\ErrorHandler\Debug::class), \E_USER_DEPRECATED);
+
 /**
  * Registers all the debug tools.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Debug instead.
  */
 class Debug
 {
@@ -25,13 +29,10 @@ class Debug
      *
      * This method registers an error handler and an exception handler.
      *
-     * If the Symfony ClassLoader component is available, a special
-     * class loader is also registered.
-     *
      * @param int  $errorReportingLevel The level of error reporting you want
      * @param bool $displayErrors       Whether to display errors (for development) or just log them (for production)
      */
-    public static function enable($errorReportingLevel = E_ALL, $displayErrors = true)
+    public static function enable($errorReportingLevel = \E_ALL, $displayErrors = true)
     {
         if (static::$enabled) {
             return;
@@ -42,13 +43,13 @@ class Debug
         if (null !== $errorReportingLevel) {
             error_reporting($errorReportingLevel);
         } else {
-            error_reporting(E_ALL);
+            error_reporting(\E_ALL);
         }
 
-        if ('cli' !== PHP_SAPI) {
+        if (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
-        } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {
+        } elseif ($displayErrors && (!filter_var(\ini_get('log_errors'), \FILTER_VALIDATE_BOOLEAN) || \ini_get('error_log'))) {
             // CLI - display errors only if they're not already logged to STDERR
             ini_set('display_errors', 1);
         }

DebugClassLoader.php

@@ -11,6 +11,10 @@
 
 namespace Symfony\Component\Debug;
 
+use PHPUnit\Framework\MockObject\Matcher\StatelessInvocation;
+
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', DebugClassLoader::class, \Symfony\Component\ErrorHandler\DebugClassLoader::class), \E_USER_DEPRECATED);
+
 /**
  * Autoloader checking if the class is really defined in the file found.
  *
@@ -21,29 +25,34 @@ namespace Symfony\Component\Debug;
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Christophe Coevoet <stof@notk.org>
  * @author Nicolas Grekas <p@tchwork.com>
+ * @author Guilhem Niot <guilhem.niot@gmail.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\DebugClassLoader instead.
  */
 class DebugClassLoader
 {
     private $classLoader;
     private $isFinder;
+    private $loaded = [];
     private static $caseCheck;
-    private static $deprecated = array();
-    private static $php7Reserved = array('int', 'float', 'bool', 'string', 'true', 'false', 'null');
-    private static $darwinCache = array('/' => array('/', array()));
+    private static $checkedClasses = [];
+    private static $final = [];
+    private static $finalMethods = [];
+    private static $deprecated = [];
+    private static $internal = [];
+    private static $internalMethods = [];
+    private static $annotatedParameters = [];
+    private static $darwinCache = ['/' => ['/', []]];
+    private static $method = [];
 
-    /**
-     * Constructor.
-     *
-     * @param callable $classLoader A class loader
-     */
     public function __construct(callable $classLoader)
     {
         $this->classLoader = $classLoader;
-        $this->isFinder = is_array($classLoader) && method_exists($classLoader[0], 'findFile');
+        $this->isFinder = \is_array($classLoader) && method_exists($classLoader[0], 'findFile');
 
         if (!isset(self::$caseCheck)) {
-            $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), DIRECTORY_SEPARATOR);
-            $i = strrpos($file, DIRECTORY_SEPARATOR);
+            $file = file_exists(__FILE__) ? __FILE__ : rtrim(realpath('.'), \DIRECTORY_SEPARATOR);
+            $i = strrpos($file, \DIRECTORY_SEPARATOR);
             $dir = substr($file, 0, 1 + $i);
             $file = substr($file, 1 + $i);
             $test = strtoupper($file) === $file ? strtolower($file) : strtoupper($file);
@@ -52,10 +61,10 @@ class DebugClassLoader
             if (false === $test || false === $i) {
                 // filesystem is case sensitive
                 self::$caseCheck = 0;
-            } elseif (substr($test, -strlen($file)) === $file) {
+            } elseif (substr($test, -\strlen($file)) === $file) {
                 // filesystem is case insensitive and realpath() normalizes the case of characters
                 self::$caseCheck = 1;
-            } elseif (false !== stripos(PHP_OS, 'darwin')) {
+            } elseif (false !== stripos(\PHP_OS, 'darwin')) {
                 // on MacOSX, HFS+ is case insensitive but realpath() doesn't normalize the case of characters
                 self::$caseCheck = 2;
             } else {
@@ -81,10 +90,10 @@ class DebugClassLoader
     public static function enable()
     {
         // Ensures we don't hit https://bugs.php.net/42098
-        class_exists('Symfony\Component\Debug\ErrorHandler');
-        class_exists('Psr\Log\LogLevel');
+        class_exists(\Symfony\Component\Debug\ErrorHandler::class);
+        class_exists(\Psr\Log\LogLevel::class);
 
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -93,8 +102,8 @@ class DebugClassLoader
         }
 
         foreach ($functions as $function) {
-            if (!is_array($function) || !$function[0] instanceof self) {
-                $function = array(new static($function), 'loadClass');
+            if (!\is_array($function) || !$function[0] instanceof self) {
+                $function = [new static($function), 'loadClass'];
             }
 
             spl_autoload_register($function);
@@ -106,7 +115,7 @@ class DebugClassLoader
      */
     public static function disable()
     {
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -115,7 +124,7 @@ class DebugClassLoader
         }
 
         foreach ($functions as $function) {
-            if (is_array($function) && $function[0] instanceof self) {
+            if (\is_array($function) && $function[0] instanceof self) {
                 $function = $function[0]->getClassLoader();
             }
 
@@ -123,192 +132,407 @@ class DebugClassLoader
         }
     }
 
+    /**
+     * @return string|null
+     */
+    public function findFile($class)
+    {
+        return $this->isFinder ? $this->classLoader[0]->findFile($class) ?: null : null;
+    }
+
     /**
      * Loads the given class or interface.
      *
      * @param string $class The name of the class
      *
-     * @return bool|null True, if loaded
-     *
      * @throws \RuntimeException
      */
     public function loadClass($class)
     {
-        ErrorHandler::stackErrors();
+        $e = error_reporting(error_reporting() | \E_PARSE | \E_ERROR | \E_CORE_ERROR | \E_COMPILE_ERROR);
 
         try {
-            if ($this->isFinder) {
-                if ($file = $this->classLoader[0]->findFile($class)) {
-                    require_once $file;
+            if ($this->isFinder && !isset($this->loaded[$class])) {
+                $this->loaded[$class] = true;
+                if (!$file = $this->classLoader[0]->findFile($class) ?: false) {
+                    // no-op
+                } elseif (\function_exists('opcache_is_script_cached') && @opcache_is_script_cached($file)) {
+                    include $file;
+
+                    return;
+                } elseif (false === include $file) {
+                    return;
                 }
             } else {
-                call_user_func($this->classLoader, $class);
+                ($this->classLoader)($class);
                 $file = false;
             }
         } finally {
-            ErrorHandler::unstackErrors();
+            error_reporting($e);
         }
 
-        $exists = class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
+        $this->checkClass($class, $file);
+    }
 
-        if ($class && '\\' === $class[0]) {
+    private function checkClass(string $class, string $file = null)
+    {
+        $exists = null === $file || class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
+
+        if (null !== $file && $class && '\\' === $class[0]) {
             $class = substr($class, 1);
         }
 
         if ($exists) {
+            if (isset(self::$checkedClasses[$class])) {
+                return;
+            }
+            self::$checkedClasses[$class] = true;
+
             $refl = new \ReflectionClass($class);
+            if (null === $file && $refl->isInternal()) {
+                return;
+            }
             $name = $refl->getName();
 
             if ($name !== $class && 0 === strcasecmp($name, $class)) {
-                throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: %s vs %s', $class, $name));
+                throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: "%s" vs "%s".', $class, $name));
             }
 
-            if (in_array(strtolower($refl->getShortName()), self::$php7Reserved)) {
-                @trigger_error(sprintf('%s uses a reserved class name (%s) that will break on PHP 7 and higher', $name, $refl->getShortName()), E_USER_DEPRECATED);
-            } elseif (preg_match('#\n \* @deprecated (.*?)\r?\n \*(?: @|/$)#s', $refl->getDocComment(), $notice)) {
-                self::$deprecated[$name] = preg_replace('#\s*\r?\n \* +#', ' ', $notice[1]);
-            } else {
-                if (2 > $len = 1 + (strpos($name, '\\', 1 + strpos($name, '\\')) ?: strpos($name, '_'))) {
-                    $len = 0;
-                    $ns = '';
-                } else {
-                    switch ($ns = substr($name, 0, $len)) {
-                        case 'Symfony\Bridge\\':
-                        case 'Symfony\Bundle\\':
-                        case 'Symfony\Component\\':
-                            $ns = 'Symfony\\';
-                            $len = strlen($ns);
-                            break;
-                    }
-                }
-                $parent = get_parent_class($class);
+            $deprecations = $this->checkAnnotations($refl, $name);
 
-                if (!$parent || strncmp($ns, $parent, $len)) {
-                    if ($parent && isset(self::$deprecated[$parent]) && strncmp($ns, $parent, $len)) {
-                        @trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent, self::$deprecated[$parent]), E_USER_DEPRECATED);
-                    }
-
-                    $parentInterfaces = array();
-                    $deprecatedInterfaces = array();
-                    if ($parent) {
-                        foreach (class_implements($parent) as $interface) {
-                            $parentInterfaces[$interface] = 1;
-                        }
-                    }
-
-                    foreach ($refl->getInterfaceNames() as $interface) {
-                        if (isset(self::$deprecated[$interface]) && strncmp($ns, $interface, $len)) {
-                            $deprecatedInterfaces[] = $interface;
-                        }
-                        foreach (class_implements($interface) as $interface) {
-                            $parentInterfaces[$interface] = 1;
-                        }
-                    }
-
-                    foreach ($deprecatedInterfaces as $interface) {
-                        if (!isset($parentInterfaces[$interface])) {
-                            @trigger_error(sprintf('The %s %s %s that is deprecated %s', $name, $refl->isInterface() ? 'interface extends' : 'class implements', $interface, self::$deprecated[$interface]), E_USER_DEPRECATED);
-                        }
-                    }
-                }
+            foreach ($deprecations as $message) {
+                @trigger_error($message, \E_USER_DEPRECATED);
             }
         }
 
-        if ($file) {
-            if (!$exists) {
-                if (false !== strpos($class, '/')) {
-                    throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
-                }
+        if (!$file) {
+            return;
+        }
 
-                throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
-            }
-            if (self::$caseCheck) {
-                $real = explode('\\', $class.strrchr($file, '.'));
-                $tail = explode(DIRECTORY_SEPARATOR, str_replace('/', DIRECTORY_SEPARATOR, $file));
-
-                $i = count($tail) - 1;
-                $j = count($real) - 1;
-
-                while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
-                    --$i;
-                    --$j;
-                }
-
-                array_splice($tail, 0, $i + 1);
-            }
-            if (self::$caseCheck && $tail) {
-                $tail = DIRECTORY_SEPARATOR.implode(DIRECTORY_SEPARATOR, $tail);
-                $tailLen = strlen($tail);
-                $real = $refl->getFileName();
-
-                if (2 === self::$caseCheck) {
-                    // realpath() on MacOSX doesn't normalize the case of characters
-
-                    $i = 1 + strrpos($real, '/');
-                    $file = substr($real, $i);
-                    $real = substr($real, 0, $i);
-
-                    if (isset(self::$darwinCache[$real])) {
-                        $kDir = $real;
-                    } else {
-                        $kDir = strtolower($real);
-
-                        if (isset(self::$darwinCache[$kDir])) {
-                            $real = self::$darwinCache[$kDir][0];
-                        } else {
-                            $dir = getcwd();
-                            chdir($real);
-                            $real = getcwd().'/';
-                            chdir($dir);
-
-                            $dir = $real;
-                            $k = $kDir;
-                            $i = strlen($dir) - 1;
-                            while (!isset(self::$darwinCache[$k])) {
-                                self::$darwinCache[$k] = array($dir, array());
-                                self::$darwinCache[$dir] = &self::$darwinCache[$k];
-
-                                while ('/' !== $dir[--$i]) {
-                                }
-                                $k = substr($k, 0, ++$i);
-                                $dir = substr($dir, 0, $i--);
-                            }
-                        }
-                    }
-
-                    $dirFiles = self::$darwinCache[$kDir][1];
-
-                    if (isset($dirFiles[$file])) {
-                        $kFile = $file;
-                    } else {
-                        $kFile = strtolower($file);
-
-                        if (!isset($dirFiles[$kFile])) {
-                            foreach (scandir($real, 2) as $f) {
-                                if ('.' !== $f[0]) {
-                                    $dirFiles[$f] = $f;
-                                    if ($f === $file) {
-                                        $kFile = $k = $file;
-                                    } elseif ($f !== $k = strtolower($f)) {
-                                        $dirFiles[$k] = $f;
-                                    }
-                                }
-                            }
-                            self::$darwinCache[$kDir][1] = $dirFiles;
-                        }
-                    }
-
-                    $real .= $dirFiles[$kFile];
-                }
-
-                if (0 === substr_compare($real, $tail, -$tailLen, $tailLen, true)
-                  && 0 !== substr_compare($real, $tail, -$tailLen, $tailLen, false)
-                ) {
-                    throw new \RuntimeException(sprintf('Case mismatch between class and real file names: %s vs %s in %s', substr($tail, -$tailLen + 1), substr($real, -$tailLen + 1), substr($real, 0, -$tailLen + 1)));
-                }
+        if (!$exists) {
+            if (false !== strpos($class, '/')) {
+                throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
             }
 
-            return true;
+            throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
+        }
+
+        if (self::$caseCheck && $message = $this->checkCase($refl, $file, $class)) {
+            throw new \RuntimeException(sprintf('Case mismatch between class and real file names: "%s" vs "%s" in "%s".', $message[0], $message[1], $message[2]));
         }
     }
+
+    public function checkAnnotations(\ReflectionClass $refl, $class)
+    {
+        $deprecations = [];
+
+        // Don't trigger deprecations for classes in the same vendor
+        if (2 > $len = 1 + (strpos($class, '\\') ?: strpos($class, '_'))) {
+            $len = 0;
+            $ns = '';
+        } else {
+            $ns = str_replace('_', '\\', substr($class, 0, $len));
+        }
+
+        // Detect annotations on the class
+        if (false !== $doc = $refl->getDocComment()) {
+            foreach (['final', 'deprecated', 'internal'] as $annotation) {
+                if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
+                    self::${$annotation}[$class] = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
+                }
+            }
+
+            if ($refl->isInterface() && false !== strpos($doc, 'method') && preg_match_all('#\n \* @method\s+(static\s+)?+(?:[\w\|&\[\]\\\]+\s+)?(\w+(?:\s*\([^\)]*\))?)+(.+?([[:punct:]]\s*)?)?(?=\r?\n \*(?: @|/$|\r?\n))#', $doc, $notice, \PREG_SET_ORDER)) {
+                foreach ($notice as $method) {
+                    $static = '' !== $method[1];
+                    $name = $method[2];
+                    $description = $method[3] ?? null;
+                    if (false === strpos($name, '(')) {
+                        $name .= '()';
+                    }
+                    if (null !== $description) {
+                        $description = trim($description);
+                        if (!isset($method[4])) {
+                            $description .= '.';
+                        }
+                    }
+                    self::$method[$class][] = [$class, $name, $static, $description];
+                }
+            }
+        }
+
+        $parent = get_parent_class($class);
+        $parentAndOwnInterfaces = $this->getOwnInterfaces($class, $parent ?: null);
+        if ($parent) {
+            $parentAndOwnInterfaces[$parent] = $parent;
+
+            if (!isset(self::$checkedClasses[$parent])) {
+                $this->checkClass($parent);
+            }
+
+            if (isset(self::$final[$parent])) {
+                $deprecations[] = sprintf('The "%s" class is considered final%s. It may change without further notice as of its next major version. You should not extend it from "%s".', $parent, self::$final[$parent], $class);
+            }
+        }
+
+        // Detect if the parent is annotated
+        foreach ($parentAndOwnInterfaces + class_uses($class, false) as $use) {
+            if (!isset(self::$checkedClasses[$use])) {
+                $this->checkClass($use);
+            }
+            if (isset(self::$deprecated[$use]) && strncmp($ns, str_replace('_', '\\', $use), $len) && !isset(self::$deprecated[$class])) {
+                $type = class_exists($class, false) ? 'class' : (interface_exists($class, false) ? 'interface' : 'trait');
+                $verb = class_exists($use, false) || interface_exists($class, false) ? 'extends' : (interface_exists($use, false) ? 'implements' : 'uses');
+
+                $deprecations[] = sprintf('The "%s" %s %s "%s" that is deprecated%s.', $class, $type, $verb, $use, self::$deprecated[$use]);
+            }
+            if (isset(self::$internal[$use]) && strncmp($ns, str_replace('_', '\\', $use), $len)) {
+                $deprecations[] = sprintf('The "%s" %s is considered internal%s. It may change without further notice. You should not use it from "%s".', $use, class_exists($use, false) ? 'class' : (interface_exists($use, false) ? 'interface' : 'trait'), self::$internal[$use], $class);
+            }
+            if (isset(self::$method[$use])) {
+                if ($refl->isAbstract()) {
+                    if (isset(self::$method[$class])) {
+                        self::$method[$class] = array_merge(self::$method[$class], self::$method[$use]);
+                    } else {
+                        self::$method[$class] = self::$method[$use];
+                    }
+                } elseif (!$refl->isInterface()) {
+                    $hasCall = $refl->hasMethod('__call');
+                    $hasStaticCall = $refl->hasMethod('__callStatic');
+                    foreach (self::$method[$use] as $method) {
+                        [$interface, $name, $static, $description] = $method;
+                        if ($static ? $hasStaticCall : $hasCall) {
+                            continue;
+                        }
+                        $realName = substr($name, 0, strpos($name, '('));
+                        if (!$refl->hasMethod($realName) || !($methodRefl = $refl->getMethod($realName))->isPublic() || ($static && !$methodRefl->isStatic()) || (!$static && $methodRefl->isStatic())) {
+                            $deprecations[] = sprintf('Class "%s" should implement method "%s::%s"%s', $class, ($static ? 'static ' : '').$interface, $name, null == $description ? '.' : ': '.$description);
+                        }
+                    }
+                }
+            }
+        }
+
+        if (trait_exists($class)) {
+            return $deprecations;
+        }
+
+        // Inherit @final, @internal and @param annotations for methods
+        self::$finalMethods[$class] = [];
+        self::$internalMethods[$class] = [];
+        self::$annotatedParameters[$class] = [];
+        foreach ($parentAndOwnInterfaces as $use) {
+            foreach (['finalMethods', 'internalMethods', 'annotatedParameters'] as $property) {
+                if (isset(self::${$property}[$use])) {
+                    self::${$property}[$class] = self::${$property}[$class] ? self::${$property}[$use] + self::${$property}[$class] : self::${$property}[$use];
+                }
+            }
+        }
+
+        foreach ($refl->getMethods(\ReflectionMethod::IS_PUBLIC | \ReflectionMethod::IS_PROTECTED) as $method) {
+            if ($method->class !== $class) {
+                continue;
+            }
+
+            if ($parent && isset(self::$finalMethods[$parent][$method->name])) {
+                [$declaringClass, $message] = self::$finalMethods[$parent][$method->name];
+                $deprecations[] = sprintf('The "%s::%s()" method is considered final%s. It may change without further notice as of its next major version. You should not extend it from "%s".', $declaringClass, $method->name, $message, $class);
+            }
+
+            if (isset(self::$internalMethods[$class][$method->name])) {
+                [$declaringClass, $message] = self::$internalMethods[$class][$method->name];
+                if (strncmp($ns, $declaringClass, $len)) {
+                    $deprecations[] = sprintf('The "%s::%s()" method is considered internal%s. It may change without further notice. You should not extend it from "%s".', $declaringClass, $method->name, $message, $class);
+                }
+            }
+
+            // To read method annotations
+            $doc = $method->getDocComment();
+
+            if (isset(self::$annotatedParameters[$class][$method->name])) {
+                $definedParameters = [];
+                foreach ($method->getParameters() as $parameter) {
+                    $definedParameters[$parameter->name] = true;
+                }
+
+                foreach (self::$annotatedParameters[$class][$method->name] as $parameterName => $deprecation) {
+                    if (!isset($definedParameters[$parameterName]) && !($doc && preg_match("/\\n\\s+\\* @param +((?(?!callable *\().*?|callable *\(.*\).*?))(?<= )\\\${$parameterName}\\b/", $doc))) {
+                        $deprecations[] = sprintf($deprecation, $class);
+                    }
+                }
+            }
+
+            if (!$doc) {
+                continue;
+            }
+
+            $finalOrInternal = false;
+
+            foreach (['final', 'internal'] as $annotation) {
+                if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
+                    $message = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
+                    self::${$annotation.'Methods'}[$class][$method->name] = [$class, $message];
+                    $finalOrInternal = true;
+                }
+            }
+
+            if ($finalOrInternal || $method->isConstructor() || false === strpos($doc, '@param') || StatelessInvocation::class === $class) {
+                continue;
+            }
+            if (!preg_match_all('#\n\s+\* @param +((?(?!callable *\().*?|callable *\(.*\).*?))(?<= )\$([a-zA-Z0-9_\x7f-\xff]++)#', $doc, $matches, \PREG_SET_ORDER)) {
+                continue;
+            }
+            if (!isset(self::$annotatedParameters[$class][$method->name])) {
+                $definedParameters = [];
+                foreach ($method->getParameters() as $parameter) {
+                    $definedParameters[$parameter->name] = true;
+                }
+            }
+            foreach ($matches as [, $parameterType, $parameterName]) {
+                if (!isset($definedParameters[$parameterName])) {
+                    $parameterType = trim($parameterType);
+                    self::$annotatedParameters[$class][$method->name][$parameterName] = sprintf('The "%%s::%s()" method will require a new "%s$%s" argument in the next major version of its %s "%s", not defining it is deprecated.', $method->name, $parameterType ? $parameterType.' ' : '', $parameterName, interface_exists($class) ? 'interface' : 'parent class', $method->class);
+                }
+            }
+        }
+
+        return $deprecations;
+    }
+
+    /**
+     * @param string $file
+     * @param string $class
+     *
+     * @return array|null
+     */
+    public function checkCase(\ReflectionClass $refl, $file, $class)
+    {
+        $real = explode('\\', $class.strrchr($file, '.'));
+        $tail = explode(\DIRECTORY_SEPARATOR, str_replace('/', \DIRECTORY_SEPARATOR, $file));
+
+        $i = \count($tail) - 1;
+        $j = \count($real) - 1;
+
+        while (isset($tail[$i], $real[$j]) && $tail[$i] === $real[$j]) {
+            --$i;
+            --$j;
+        }
+
+        array_splice($tail, 0, $i + 1);
+
+        if (!$tail) {
+            return null;
+        }
+
+        $tail = \DIRECTORY_SEPARATOR.implode(\DIRECTORY_SEPARATOR, $tail);
+        $tailLen = \strlen($tail);
+        $real = $refl->getFileName();
+
+        if (2 === self::$caseCheck) {
+            $real = $this->darwinRealpath($real);
+        }
+
+        if (0 === substr_compare($real, $tail, -$tailLen, $tailLen, true)
+            && 0 !== substr_compare($real, $tail, -$tailLen, $tailLen, false)
+        ) {
+            return [substr($tail, -$tailLen + 1), substr($real, -$tailLen + 1), substr($real, 0, -$tailLen + 1)];
+        }
+
+        return null;
+    }
+
+    /**
+     * `realpath` on MacOSX doesn't normalize the case of characters.
+     */
+    private function darwinRealpath(string $real): string
+    {
+        $i = 1 + strrpos($real, '/');
+        $file = substr($real, $i);
+        $real = substr($real, 0, $i);
+
+        if (isset(self::$darwinCache[$real])) {
+            $kDir = $real;
+        } else {
+            $kDir = strtolower($real);
+
+            if (isset(self::$darwinCache[$kDir])) {
+                $real = self::$darwinCache[$kDir][0];
+            } else {
+                $dir = getcwd();
+
+                if (!@chdir($real)) {
+                    return $real.$file;
+                }
+
+                $real = getcwd().'/';
+                chdir($dir);
+
+                $dir = $real;
+                $k = $kDir;
+                $i = \strlen($dir) - 1;
+                while (!isset(self::$darwinCache[$k])) {
+                    self::$darwinCache[$k] = [$dir, []];
+                    self::$darwinCache[$dir] = &self::$darwinCache[$k];
+
+                    while ('/' !== $dir[--$i]) {
+                    }
+                    $k = substr($k, 0, ++$i);
+                    $dir = substr($dir, 0, $i--);
+                }
+            }
+        }
+
+        $dirFiles = self::$darwinCache[$kDir][1];
+
+        if (!isset($dirFiles[$file]) && ') : eval()\'d code' === substr($file, -17)) {
+            // Get the file name from "file_name.php(123) : eval()'d code"
+            $file = substr($file, 0, strrpos($file, '(', -17));
+        }
+
+        if (isset($dirFiles[$file])) {
+            return $real.$dirFiles[$file];
+        }
+
+        $kFile = strtolower($file);
+
+        if (!isset($dirFiles[$kFile])) {
+            foreach (scandir($real, 2) as $f) {
+                if ('.' !== $f[0]) {
+                    $dirFiles[$f] = $f;
+                    if ($f === $file) {
+                        $kFile = $k = $file;
+                    } elseif ($f !== $k = strtolower($f)) {
+                        $dirFiles[$k] = $f;
+                    }
+                }
+            }
+            self::$darwinCache[$kDir][1] = $dirFiles;
+        }
+
+        return $real.$dirFiles[$kFile];
+    }
+
+    /**
+     * `class_implements` includes interfaces from the parents so we have to manually exclude them.
+     *
+     * @return string[]
+     */
+    private function getOwnInterfaces(string $class, ?string $parent): array
+    {
+        $ownInterfaces = class_implements($class, false);
+
+        if ($parent) {
+            foreach (class_implements($parent, false) as $interface) {
+                unset($ownInterfaces[$interface]);
+            }
+        }
+
+        foreach ($ownInterfaces as $interface) {
+            foreach (class_implements($interface) as $interface) {
+                unset($ownInterfaces[$interface]);
+            }
+        }
+
+        return $ownInterfaces;
+    }
 }

ErrorHandler.php

@@ -11,17 +11,19 @@
 
 namespace Symfony\Component\Debug;
 
-use Psr\Log\LogLevel;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\Debug\Exception\ContextErrorException;
+use Psr\Log\LogLevel;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\Exception\FatalThrowableError;
+use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
-use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
-use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
 use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
 use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
+
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', ErrorHandler::class, \Symfony\Component\ErrorHandler\ErrorHandler::class), \E_USER_DEPRECATED);
 
 /**
  * A generic ErrorHandler for the PHP engine.
@@ -45,44 +47,48 @@ use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;
  *
  * @author Nicolas Grekas <p@tchwork.com>
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ *
+ * @final since Symfony 4.3
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\ErrorHandler instead.
  */
 class ErrorHandler
 {
-    private $levels = array(
-        E_DEPRECATED => 'Deprecated',
-        E_USER_DEPRECATED => 'User Deprecated',
-        E_NOTICE => 'Notice',
-        E_USER_NOTICE => 'User Notice',
-        E_STRICT => 'Runtime Notice',
-        E_WARNING => 'Warning',
-        E_USER_WARNING => 'User Warning',
-        E_COMPILE_WARNING => 'Compile Warning',
-        E_CORE_WARNING => 'Core Warning',
-        E_USER_ERROR => 'User Error',
-        E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
-        E_COMPILE_ERROR => 'Compile Error',
-        E_PARSE => 'Parse Error',
-        E_ERROR => 'Error',
-        E_CORE_ERROR => 'Core Error',
-    );
+    private $levels = [
+        \E_DEPRECATED => 'Deprecated',
+        \E_USER_DEPRECATED => 'User Deprecated',
+        \E_NOTICE => 'Notice',
+        \E_USER_NOTICE => 'User Notice',
+        \E_STRICT => 'Runtime Notice',
+        \E_WARNING => 'Warning',
+        \E_USER_WARNING => 'User Warning',
+        \E_COMPILE_WARNING => 'Compile Warning',
+        \E_CORE_WARNING => 'Core Warning',
+        \E_USER_ERROR => 'User Error',
+        \E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
+        \E_COMPILE_ERROR => 'Compile Error',
+        \E_PARSE => 'Parse Error',
+        \E_ERROR => 'Error',
+        \E_CORE_ERROR => 'Core Error',
+    ];
 
-    private $loggers = array(
-        E_DEPRECATED => array(null, LogLevel::INFO),
-        E_USER_DEPRECATED => array(null, LogLevel::INFO),
-        E_NOTICE => array(null, LogLevel::WARNING),
-        E_USER_NOTICE => array(null, LogLevel::WARNING),
-        E_STRICT => array(null, LogLevel::WARNING),
-        E_WARNING => array(null, LogLevel::WARNING),
-        E_USER_WARNING => array(null, LogLevel::WARNING),
-        E_COMPILE_WARNING => array(null, LogLevel::WARNING),
-        E_CORE_WARNING => array(null, LogLevel::WARNING),
-        E_USER_ERROR => array(null, LogLevel::CRITICAL),
-        E_RECOVERABLE_ERROR => array(null, LogLevel::CRITICAL),
-        E_COMPILE_ERROR => array(null, LogLevel::CRITICAL),
-        E_PARSE => array(null, LogLevel::CRITICAL),
-        E_ERROR => array(null, LogLevel::CRITICAL),
-        E_CORE_ERROR => array(null, LogLevel::CRITICAL),
-    );
+    private $loggers = [
+        \E_DEPRECATED => [null, LogLevel::INFO],
+        \E_USER_DEPRECATED => [null, LogLevel::INFO],
+        \E_NOTICE => [null, LogLevel::WARNING],
+        \E_USER_NOTICE => [null, LogLevel::WARNING],
+        \E_STRICT => [null, LogLevel::WARNING],
+        \E_WARNING => [null, LogLevel::WARNING],
+        \E_USER_WARNING => [null, LogLevel::WARNING],
+        \E_COMPILE_WARNING => [null, LogLevel::WARNING],
+        \E_CORE_WARNING => [null, LogLevel::WARNING],
+        \E_USER_ERROR => [null, LogLevel::CRITICAL],
+        \E_RECOVERABLE_ERROR => [null, LogLevel::CRITICAL],
+        \E_COMPILE_ERROR => [null, LogLevel::CRITICAL],
+        \E_PARSE => [null, LogLevel::CRITICAL],
+        \E_ERROR => [null, LogLevel::CRITICAL],
+        \E_CORE_ERROR => [null, LogLevel::CRITICAL],
+    ];
 
     private $thrownErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
     private $scopedErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
@@ -97,9 +103,9 @@ class ErrorHandler
     private $bootstrappingLogger;
 
     private static $reservedMemory;
-    private static $stackedErrors = array();
-    private static $stackedErrorLevels = array();
     private static $toStringException = null;
+    private static $silencedErrorCache = [];
+    private static $silencedErrorCount = 0;
     private static $exitCode = 0;
 
     /**
@@ -113,7 +119,7 @@ class ErrorHandler
     public static function register(self $handler = null, $replace = true)
     {
         if (null === self::$reservedMemory) {
-            self::$reservedMemory = str_repeat('x', 10240);
+            self::$reservedMemory = str_repeat('x', 32768);
             register_shutdown_function(__CLASS__.'::handleFatalError');
         }
 
@@ -121,24 +127,38 @@ class ErrorHandler
             $handler = new static();
         }
 
-        if (null === $prev = set_error_handler(array($handler, 'handleError'))) {
+        if (null === $prev = set_error_handler([$handler, 'handleError'])) {
             restore_error_handler();
             // Specifying the error types earlier would expose us to https://bugs.php.net/63206
-            set_error_handler(array($handler, 'handleError'), $handler->thrownErrors | $handler->loggedErrors);
+            set_error_handler([$handler, 'handleError'], $handler->thrownErrors | $handler->loggedErrors);
             $handler->isRoot = true;
         }
 
-        if ($handlerIsNew && is_array($prev) && $prev[0] instanceof self) {
+        if ($handlerIsNew && \is_array($prev) && $prev[0] instanceof self) {
             $handler = $prev[0];
             $replace = false;
         }
-        if ($replace || !$prev) {
-            $handler->setExceptionHandler(set_exception_handler(array($handler, 'handleException')));
-        } else {
+        if (!$replace && $prev) {
             restore_error_handler();
+            $handlerIsRegistered = \is_array($prev) && $handler === $prev[0];
+        } else {
+            $handlerIsRegistered = true;
+        }
+        if (\is_array($prev = set_exception_handler([$handler, 'handleException'])) && $prev[0] instanceof self) {
+            restore_exception_handler();
+            if (!$handlerIsRegistered) {
+                $handler = $prev[0];
+            } elseif ($handler !== $prev[0] && $replace) {
+                set_exception_handler([$handler, 'handleException']);
+                $p = $prev[0]->setExceptionHandler(null);
+                $handler->setExceptionHandler($p);
+                $prev[0]->setExceptionHandler($p);
+            }
+        } else {
+            $handler->setExceptionHandler($prev);
         }
 
-        $handler->throwAt(E_ALL & $handler->thrownErrors, true);
+        $handler->throwAt(\E_ALL & $handler->thrownErrors, true);
 
         return $handler;
     }
@@ -149,30 +169,29 @@ class ErrorHandler
             $this->bootstrappingLogger = $bootstrappingLogger;
             $this->setDefaultLogger($bootstrappingLogger);
         }
-        $this->traceReflector = new \ReflectionProperty('Exception', 'trace');
+        $this->traceReflector = new \ReflectionProperty(\Exception::class, 'trace');
         $this->traceReflector->setAccessible(true);
     }
 
     /**
      * Sets a logger to non assigned errors levels.
      *
-     * @param LoggerInterface $logger  A PSR-3 logger to put as default for the given levels
-     * @param array|int       $levels  An array map of E_* to LogLevel::* or an integer bit field of E_* constants
-     * @param bool            $replace Whether to replace or not any existing logger
+     * @param array|int $levels  An array map of E_* to LogLevel::* or an integer bit field of E_* constants
+     * @param bool      $replace Whether to replace or not any existing logger
      */
-    public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $replace = false)
+    public function setDefaultLogger(LoggerInterface $logger, $levels = \E_ALL, $replace = false)
     {
-        $loggers = array();
+        $loggers = [];
 
-        if (is_array($levels)) {
+        if (\is_array($levels)) {
             foreach ($levels as $type => $logLevel) {
                 if (empty($this->loggers[$type][0]) || $replace || $this->loggers[$type][0] === $this->bootstrappingLogger) {
-                    $loggers[$type] = array($logger, $logLevel);
+                    $loggers[$type] = [$logger, $logLevel];
                 }
             }
         } else {
             if (null === $levels) {
-                $levels = E_ALL;
+                $levels = \E_ALL;
             }
             foreach ($this->loggers as $type => $log) {
                 if (($type & $levels) && (empty($log[0]) || $replace || $log[0] === $this->bootstrappingLogger)) {
@@ -198,23 +217,23 @@ class ErrorHandler
     {
         $prevLogged = $this->loggedErrors;
         $prev = $this->loggers;
-        $flush = array();
+        $flush = [];
 
         foreach ($loggers as $type => $log) {
             if (!isset($prev[$type])) {
                 throw new \InvalidArgumentException('Unknown error type: '.$type);
             }
-            if (!is_array($log)) {
-                $log = array($log);
-            } elseif (!array_key_exists(0, $log)) {
-                throw new \InvalidArgumentException('No logger provided');
+            if (!\is_array($log)) {
+                $log = [$log];
+            } elseif (!\array_key_exists(0, $log)) {
+                throw new \InvalidArgumentException('No logger provided.');
             }
             if (null === $log[0]) {
                 $this->loggedErrors &= ~$type;
             } elseif ($log[0] instanceof LoggerInterface) {
                 $this->loggedErrors |= $type;
             } else {
-                throw new \InvalidArgumentException('Invalid logger provided');
+                throw new \InvalidArgumentException('Invalid logger provided.');
             }
             $this->loggers[$type] = $log + $prev[$type];
 
@@ -226,7 +245,7 @@ class ErrorHandler
 
         if ($flush) {
             foreach ($this->bootstrappingLogger->cleanLogs() as $log) {
-                $type = $log[2]['exception'] instanceof \ErrorException ? $log[2]['exception']->getSeverity() : E_ERROR;
+                $type = $log[2]['exception'] instanceof \ErrorException ? $log[2]['exception']->getSeverity() : \E_ERROR;
                 if (!isset($flush[$type])) {
                     $this->bootstrappingLogger->log($log[0], $log[1], $log[2]);
                 } elseif ($this->loggers[$type][0]) {
@@ -264,7 +283,7 @@ class ErrorHandler
     public function throwAt($levels, $replace = false)
     {
         $prev = $this->thrownErrors;
-        $this->thrownErrors = ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
+        $this->thrownErrors = ($levels | \E_RECOVERABLE_ERROR | \E_USER_ERROR) & ~\E_USER_DEPRECATED & ~\E_DEPRECATED;
         if (!$replace) {
             $this->thrownErrors |= $prev;
         }
@@ -333,18 +352,18 @@ class ErrorHandler
     /**
      * Re-registers as a PHP error handler if levels changed.
      */
-    private function reRegister($prev)
+    private function reRegister(int $prev)
     {
-        if ($prev !== $this->thrownErrors | $this->loggedErrors) {
-            $handler = set_error_handler('var_dump');
-            $handler = is_array($handler) ? $handler[0] : null;
+        if ($prev !== ($this->thrownErrors | $this->loggedErrors)) {
+            $handler = set_error_handler('is_int');
+            $handler = \is_array($handler) ? $handler[0] : null;
             restore_error_handler();
             if ($handler === $this) {
                 restore_error_handler();
                 if ($this->isRoot) {
-                    set_error_handler(array($this, 'handleError'), $this->thrownErrors | $this->loggedErrors);
+                    set_error_handler([$this, 'handleError'], $this->thrownErrors | $this->loggedErrors);
                 } else {
-                    set_error_handler(array($this, 'handleError'));
+                    set_error_handler([$this, 'handleError']);
                 }
             }
         }
@@ -366,79 +385,71 @@ class ErrorHandler
      */
     public function handleError($type, $message, $file, $line)
     {
+        if (\PHP_VERSION_ID >= 70300 && \E_WARNING === $type && '"' === $message[0] && false !== strpos($message, '" targeting switch is equivalent to "break')) {
+            $type = \E_DEPRECATED;
+        }
+
         // Level is the current error reporting level to manage silent error.
+        $level = error_reporting();
+        $silenced = 0 === ($level & $type);
         // Strong errors are not authorized to be silenced.
-        $level = error_reporting() | E_RECOVERABLE_ERROR | E_USER_ERROR | E_DEPRECATED | E_USER_DEPRECATED;
+        $level |= \E_RECOVERABLE_ERROR | \E_USER_ERROR | \E_DEPRECATED | \E_USER_DEPRECATED;
         $log = $this->loggedErrors & $type;
         $throw = $this->thrownErrors & $type & $level;
         $type &= $level | $this->screamedErrors;
 
         if (!$type || (!$log && !$throw)) {
-            return $type && $log;
+            return !$silenced && $type && $log;
         }
         $scope = $this->scopedErrors & $type;
 
-        if (4 < $numArgs = func_num_args()) {
-            $context = $scope ? (func_get_arg(4) ?: array()) : array();
-            $backtrace = 5 < $numArgs ? func_get_arg(5) : null; // defined on HHVM
+        if (false !== strpos($message, "@anonymous\0")) {
+            $logMessage = $this->levels[$type].': '.(new FlattenException())->setMessage($message)->getMessage();
         } else {
-            $context = array();
-            $backtrace = null;
+            $logMessage = $this->levels[$type].': '.$message;
         }
 
-        if (isset($context['GLOBALS']) && $scope) {
-            $e = $context;                  // Whatever the signature of the method,
-            unset($e['GLOBALS'], $context); // $context is always a reference in 5.3
-            $context = $e;
-        }
-
-        if (null !== $backtrace && $type & E_ERROR) {
-            // E_ERROR fatal errors are triggered on HHVM when
-            // hhvm.error_handling.call_user_handler_on_fatals=1
-            // which is the way to get their backtrace.
-            $this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace'));
-
-            return true;
-        }
-
-        $logMessage = $this->levels[$type].': '.$message;
-
         if (null !== self::$toStringException) {
             $errorAsException = self::$toStringException;
             self::$toStringException = null;
         } elseif (!$throw && !($type & $level)) {
-            $errorAsException = new SilencedErrorContext($type, $file, $line);
-        } else {
-            if ($scope) {
-                $errorAsException = new ContextErrorException($logMessage, 0, $type, $file, $line, $context);
+            if (!isset(self::$silencedErrorCache[$id = $file.':'.$line])) {
+                $lightTrace = $this->tracedErrors & $type ? $this->cleanTrace(debug_backtrace(\DEBUG_BACKTRACE_IGNORE_ARGS, 5), $type, $file, $line, false) : [];
+                $errorAsException = new SilencedErrorContext($type, $file, $line, isset($lightTrace[1]) ? [$lightTrace[0]] : $lightTrace);
+            } elseif (isset(self::$silencedErrorCache[$id][$message])) {
+                $lightTrace = null;
+                $errorAsException = self::$silencedErrorCache[$id][$message];
+                ++$errorAsException->count;
             } else {
-                $errorAsException = new \ErrorException($logMessage, 0, $type, $file, $line);
+                $lightTrace = [];
+                $errorAsException = null;
             }
 
-            // Clean the trace by removing function arguments and the first frames added by the error handler itself.
-            if ($throw || $this->tracedErrors & $type) {
-                $backtrace = $backtrace ?: $errorAsException->getTrace();
-                $lightTrace = $backtrace;
+            if (100 < ++self::$silencedErrorCount) {
+                self::$silencedErrorCache = $lightTrace = [];
+                self::$silencedErrorCount = 1;
+            }
+            if ($errorAsException) {
+                self::$silencedErrorCache[$id][$message] = $errorAsException;
+            }
+            if (null === $lightTrace) {
+                return true;
+            }
+        } else {
+            $errorAsException = new \ErrorException($logMessage, 0, $type, $file, $line);
 
-                for ($i = 0; isset($backtrace[$i]); ++$i) {
-                    if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) {
-                        $lightTrace = array_slice($lightTrace, 1 + $i);
-                        break;
-                    }
-                }
-                if (!($throw || $this->scopedErrors & $type)) {
-                    for ($i = 0; isset($lightTrace[$i]); ++$i) {
-                        unset($lightTrace[$i]['args']);
-                    }
-                }
+            if ($throw || $this->tracedErrors & $type) {
+                $backtrace = $errorAsException->getTrace();
+                $lightTrace = $this->cleanTrace($backtrace, $type, $file, $line, $throw);
                 $this->traceReflector->setValue($errorAsException, $lightTrace);
             } else {
-                $this->traceReflector->setValue($errorAsException, array());
+                $this->traceReflector->setValue($errorAsException, []);
+                $backtrace = [];
             }
         }
 
         if ($throw) {
-            if (E_USER_ERROR & $type) {
+            if (\PHP_VERSION_ID < 70400 && \E_USER_ERROR & $type) {
                 for ($i = 1; isset($backtrace[$i]); ++$i) {
                     if (isset($backtrace[$i]['function'], $backtrace[$i]['type'], $backtrace[$i - 1]['function'])
                         && '__toString' === $backtrace[$i]['function']
@@ -447,32 +458,27 @@ class ErrorHandler
                         && ('trigger_error' === $backtrace[$i - 1]['function'] || 'user_error' === $backtrace[$i - 1]['function'])
                     ) {
                         // Here, we know trigger_error() has been called from __toString().
-                        // HHVM is fine with throwing from __toString() but PHP triggers a fatal error instead.
+                        // PHP triggers a fatal error when throwing from __toString().
                         // A small convention allows working around the limitation:
                         // given a caught $e exception in __toString(), quitting the method with
                         // `return trigger_error($e, E_USER_ERROR);` allows this error handler
                         // to make $e get through the __toString() barrier.
 
+                        $context = 4 < \func_num_args() ? (func_get_arg(4) ?: []) : [];
+
                         foreach ($context as $e) {
-                            if (($e instanceof \Exception || $e instanceof \Throwable) && $e->__toString() === $message) {
-                                if (1 === $i) {
-                                    // On HHVM
-                                    $errorAsException = $e;
-                                    break;
-                                }
+                            if ($e instanceof \Throwable && $e->__toString() === $message) {
                                 self::$toStringException = $e;
 
                                 return true;
                             }
                         }
 
-                        if (1 < $i) {
-                            // On PHP (not on HHVM), display the original error message instead of the default one.
-                            $this->handleException($errorAsException);
+                        // Display the original error message instead of the default one.
+                        $this->handleException($errorAsException);
 
-                            // Stop the process by giving back the error to the native handler.
-                            return false;
-                        }
+                        // Stop the process by giving back the error to the native handler.
+                        return false;
                     }
                 }
             }
@@ -482,24 +488,26 @@ class ErrorHandler
 
         if ($this->isRecursive) {
             $log = 0;
-        } elseif (self::$stackedErrorLevels) {
-            self::$stackedErrors[] = array(
-                $this->loggers[$type][0],
-                ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG,
-                $logMessage,
-                array('exception' => $errorAsException),
-            );
         } else {
+            if (\PHP_VERSION_ID < (\PHP_VERSION_ID < 70400 ? 70316 : 70404)) {
+                $currentErrorHandler = set_error_handler('is_int');
+                restore_error_handler();
+            }
+
             try {
                 $this->isRecursive = true;
                 $level = ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG;
-                $this->loggers[$type][0]->log($level, $logMessage, array('exception' => $errorAsException));
+                $this->loggers[$type][0]->log($level, $logMessage, $errorAsException ? ['exception' => $errorAsException] : []);
             } finally {
                 $this->isRecursive = false;
+
+                if (\PHP_VERSION_ID < (\PHP_VERSION_ID < 70400 ? 70316 : 70404)) {
+                    set_error_handler($currentErrorHandler);
+                }
             }
         }
 
-        return $type && $log;
+        return !$silenced && $type && $log;
     }
 
     /**
@@ -518,33 +526,33 @@ class ErrorHandler
         if (!$exception instanceof \Exception) {
             $exception = new FatalThrowableError($exception);
         }
-        $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;
+        $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : \E_ERROR;
+        $handlerException = null;
 
         if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
+            if (false !== strpos($message = $exception->getMessage(), "@anonymous\0")) {
+                $message = (new FlattenException())->setMessage($message)->getMessage();
+            }
             if ($exception instanceof FatalErrorException) {
                 if ($exception instanceof FatalThrowableError) {
-                    $error = array(
+                    $error = [
                         'type' => $type,
-                        'message' => $message = $exception->getMessage(),
+                        'message' => $message,
                         'file' => $exception->getFile(),
                         'line' => $exception->getLine(),
-                    );
+                    ];
                 } else {
-                    $message = 'Fatal '.$exception->getMessage();
+                    $message = 'Fatal '.$message;
                 }
             } elseif ($exception instanceof \ErrorException) {
-                $message = 'Uncaught '.$exception->getMessage();
-                if ($exception instanceof ContextErrorException) {
-                    $e['context'] = $exception->getContext();
-                }
+                $message = 'Uncaught '.$message;
             } else {
-                $message = 'Uncaught Exception: '.$exception->getMessage();
+                $message = 'Uncaught Exception: '.$message;
             }
         }
         if ($this->loggedErrors & $type) {
             try {
-                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, array('exception' => $exception));
-            } catch (\Exception $handlerException) {
+                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, ['exception' => $exception]);
             } catch (\Throwable $handlerException) {
             }
         }
@@ -556,18 +564,22 @@ class ErrorHandler
                 }
             }
         }
-        if (empty($this->exceptionHandler)) {
-            throw $exception; // Give back $exception to the native handler
-        }
+        $exceptionHandler = $this->exceptionHandler;
+        $this->exceptionHandler = null;
         try {
-            call_user_func($this->exceptionHandler, $exception);
-        } catch (\Exception $handlerException) {
+            if (null !== $exceptionHandler) {
+                $exceptionHandler($exception);
+
+                return;
+            }
+            $handlerException = $handlerException ?: $exception;
         } catch (\Throwable $handlerException) {
         }
-        if (isset($handlerException)) {
-            $this->exceptionHandler = null;
-            $this->handleException($handlerException);
+        if ($exception === $handlerException) {
+            self::$reservedMemory = null; // Disable the fatal error handler
+            throw $exception; // Give back $exception to the native handler
         }
+        $this->handleException($handlerException);
     }
 
     /**
@@ -583,44 +595,60 @@ class ErrorHandler
             return;
         }
 
-        self::$reservedMemory = null;
+        $handler = self::$reservedMemory = null;
+        $handlers = [];
+        $previousHandler = null;
+        $sameHandlerLimit = 10;
 
-        $handler = set_error_handler('var_dump');
-        $handler = is_array($handler) ? $handler[0] : null;
-        restore_error_handler();
+        while (!\is_array($handler) || !$handler[0] instanceof self) {
+            $handler = set_exception_handler('is_int');
+            restore_exception_handler();
 
-        if (!$handler instanceof self) {
+            if (!$handler) {
+                break;
+            }
+            restore_exception_handler();
+
+            if ($handler !== $previousHandler) {
+                array_unshift($handlers, $handler);
+                $previousHandler = $handler;
+            } elseif (0 === --$sameHandlerLimit) {
+                $handler = null;
+                break;
+            }
+        }
+        foreach ($handlers as $h) {
+            set_exception_handler($h);
+        }
+        if (!$handler) {
             return;
         }
+        if ($handler !== $h) {
+            $handler[0]->setExceptionHandler($h);
+        }
+        $handler = $handler[0];
+        $handlers = [];
 
         if ($exit = null === $error) {
             $error = error_get_last();
         }
 
-        try {
-            while (self::$stackedErrorLevels) {
-                static::unstackErrors();
-            }
-        } catch (\Exception $exception) {
-            // Handled below
-        } catch (\Throwable $exception) {
-            // Handled below
-        }
-
-        if ($error && $error['type'] &= E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR) {
+        if ($error && $error['type'] &= \E_PARSE | \E_ERROR | \E_CORE_ERROR | \E_COMPILE_ERROR) {
             // Let's not throw anymore but keep logging
             $handler->throwAt(0, true);
-            $trace = isset($error['backtrace']) ? $error['backtrace'] : null;
+            $trace = $error['backtrace'] ?? null;
 
             if (0 === strpos($error['message'], 'Allowed memory') || 0 === strpos($error['message'], 'Out of memory')) {
                 $exception = new OutOfMemoryException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, false, $trace);
             } else {
                 $exception = new FatalErrorException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, true, $trace);
             }
+        } else {
+            $exception = null;
         }
 
         try {
-            if (isset($exception)) {
+            if (null !== $exception) {
                 self::$exitCode = 255;
                 $handler->handleException($exception, $error);
             }
@@ -634,47 +662,6 @@ class ErrorHandler
         }
     }
 
-    /**
-     * Configures the error handler for delayed handling.
-     * Ensures also that non-catchable fatal errors are never silenced.
-     *
-     * As shown by http://bugs.php.net/42098 and http://bugs.php.net/60724
-     * PHP has a compile stage where it behaves unusually. To workaround it,
-     * we plug an error handler that only stacks errors for later.
-     *
-     * The most important feature of this is to prevent
-     * autoloading until unstackErrors() is called.
-     */
-    public static function stackErrors()
-    {
-        self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
-    }
-
-    /**
-     * Unstacks stacked errors and forwards to the logger.
-     */
-    public static function unstackErrors()
-    {
-        $level = array_pop(self::$stackedErrorLevels);
-
-        if (null !== $level) {
-            $errorReportingLevel = error_reporting($level);
-            if ($errorReportingLevel !== ($level | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR)) {
-                // If the user changed the error level, do not overwrite it
-                error_reporting($errorReportingLevel);
-            }
-        }
-
-        if (empty(self::$stackedErrorLevels)) {
-            $errors = self::$stackedErrors;
-            self::$stackedErrors = array();
-
-            foreach ($errors as $error) {
-                $error[0]->log($error[1], $error[2], $error[3]);
-            }
-        }
-    }
-
     /**
      * Gets the fatal error handlers.
      *
@@ -684,10 +671,39 @@ class ErrorHandler
      */
     protected function getFatalErrorHandlers()
     {
-        return array(
+        return [
             new UndefinedFunctionFatalErrorHandler(),
             new UndefinedMethodFatalErrorHandler(),
             new ClassNotFoundFatalErrorHandler(),
-        );
+        ];
+    }
+
+    /**
+     * Cleans the trace by removing function arguments and the frames added by the error handler and DebugClassLoader.
+     */
+    private function cleanTrace(array $backtrace, int $type, string $file, int $line, bool $throw): array
+    {
+        $lightTrace = $backtrace;
+
+        for ($i = 0; isset($backtrace[$i]); ++$i) {
+            if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) {
+                $lightTrace = \array_slice($lightTrace, 1 + $i);
+                break;
+            }
+        }
+        if (class_exists(DebugClassLoader::class, false)) {
+            for ($i = \count($lightTrace) - 2; 0 < $i; --$i) {
+                if (DebugClassLoader::class === ($lightTrace[$i]['class'] ?? null)) {
+                    array_splice($lightTrace, --$i, 2);
+                }
+            }
+        }
+        if (!($throw || $this->scopedErrors & $type)) {
+            for ($i = 0; isset($lightTrace[$i]); ++$i) {
+                unset($lightTrace[$i]['args'], $lightTrace[$i]['object']);
+            }
+        }
+
+        return $lightTrace;
     }
 }

Exception/ClassNotFoundException.php

@@ -11,14 +11,18 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', ClassNotFoundException::class, \Symfony\Component\ErrorHandler\Error\ClassNotFoundError::class), \E_USER_DEPRECATED);
+
 /**
  * Class (or Trait or Interface) Not Found Exception.
  *
  * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Error\ClassNotFoundError instead.
  */
 class ClassNotFoundException extends FatalErrorException
 {
-    public function __construct($message, \ErrorException $previous)
+    public function __construct(string $message, \ErrorException $previous)
     {
         parent::__construct(
             $message,
@@ -26,6 +30,9 @@ class ClassNotFoundException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

Exception/ContextErrorException.php

@@ -1,36 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Debug\Exception;
-
-/**
- * Error Exception with Variable Context.
- *
- * @author Christian Sciberras <uuf6429@gmail.com>
- */
-class ContextErrorException extends \ErrorException
-{
-    private $context = array();
-
-    public function __construct($message, $code, $severity, $filename, $lineno, $context = array())
-    {
-        parent::__construct($message, $code, $severity, $filename, $lineno);
-        $this->context = $context;
-    }
-
-    /**
-     * @return array Array of variables that existed when the exception occurred
-     */
-    public function getContext()
-    {
-        return $this->context;
-    }
-}

Exception/FatalErrorException.php

@@ -11,16 +11,20 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', FatalErrorException::class, \Symfony\Component\ErrorHandler\Error\FatalError::class), \E_USER_DEPRECATED);
+
 /**
  * Fatal Error Exception.
  *
  * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Error\FatalError instead.
  */
 class FatalErrorException extends \ErrorException
 {
-    public function __construct($message, $code, $severity, $filename, $lineno, $traceOffset = null, $traceArgs = true, array $trace = null)
+    public function __construct(string $message, int $code, int $severity, string $filename, int $lineno, int $traceOffset = null, bool $traceArgs = true, array $trace = null, \Throwable $previous = null)
     {
-        parent::__construct($message, $code, $severity, $filename, $lineno);
+        parent::__construct($message, $code, $severity, $filename, $lineno, $previous);
 
         if (null !== $trace) {
             if (!$traceArgs) {
@@ -31,8 +35,7 @@ class FatalErrorException extends \ErrorException
 
             $this->setTrace($trace);
         } elseif (null !== $traceOffset) {
-            if (function_exists('xdebug_get_function_stack')) {
-                $trace = xdebug_get_function_stack();
+            if (\function_exists('xdebug_get_function_stack') && $trace = @xdebug_get_function_stack()) {
                 if (0 < $traceOffset) {
                     array_splice($trace, -$traceOffset);
                 }
@@ -60,13 +63,8 @@ class FatalErrorException extends \ErrorException
 
                 unset($frame);
                 $trace = array_reverse($trace);
-            } elseif (function_exists('symfony_debug_backtrace')) {
-                $trace = symfony_debug_backtrace();
-                if (0 < $traceOffset) {
-                    array_splice($trace, 0, $traceOffset);
-                }
             } else {
-                $trace = array();
+                $trace = [];
             }
 
             $this->setTrace($trace);
@@ -75,7 +73,7 @@ class FatalErrorException extends \ErrorException
 
     protected function setTrace($trace)
     {
-        $traceReflector = new \ReflectionProperty('Exception', 'trace');
+        $traceReflector = new \ReflectionProperty(\Exception::class, 'trace');
         $traceReflector->setAccessible(true);
         $traceReflector->setValue($this, $trace);
     }

Exception/FatalThrowableError.php

@@ -11,34 +11,45 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4.', FatalThrowableError::class), \E_USER_DEPRECATED);
+
 /**
  * Fatal Throwable Error.
  *
  * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @deprecated since Symfony 4.4
  */
 class FatalThrowableError extends FatalErrorException
 {
+    private $originalClassName;
+
     public function __construct(\Throwable $e)
     {
+        $this->originalClassName = \get_class($e);
+
         if ($e instanceof \ParseError) {
-            $message = 'Parse error: '.$e->getMessage();
-            $severity = E_PARSE;
+            $severity = \E_PARSE;
         } elseif ($e instanceof \TypeError) {
-            $message = 'Type error: '.$e->getMessage();
-            $severity = E_RECOVERABLE_ERROR;
+            $severity = \E_RECOVERABLE_ERROR;
         } else {
-            $message = $e->getMessage();
-            $severity = E_ERROR;
+            $severity = \E_ERROR;
         }
 
         \ErrorException::__construct(
-            $message,
+            $e->getMessage(),
             $e->getCode(),
             $severity,
             $e->getFile(),
-            $e->getLine()
+            $e->getLine(),
+            $e->getPrevious()
         );
 
         $this->setTrace($e->getTrace());
     }
+
+    public function getOriginalClassName(): string
+    {
+        return $this->originalClassName;
+    }
 }

Exception/FlattenException.php

@@ -11,14 +11,17 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
 use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
 
 /**
- * FlattenException wraps a PHP Exception to be able to serialize it.
+ * FlattenException wraps a PHP Error or Exception to be able to serialize it.
  *
  * Basically, this class removes all objects from the trace.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Exception\FlattenException instead.
  */
 class FlattenException
 {
@@ -26,13 +29,25 @@ class FlattenException
     private $code;
     private $previous;
     private $trace;
+    private $traceAsString;
     private $class;
     private $statusCode;
     private $headers;
     private $file;
     private $line;
 
-    public static function create(\Exception $exception, $statusCode = null, array $headers = array())
+    /**
+     * @return static
+     */
+    public static function create(\Exception $exception, $statusCode = null, array $headers = [])
+    {
+        return static::createFromThrowable($exception, $statusCode, $headers);
+    }
+
+    /**
+     * @return static
+     */
+    public static function createFromThrowable(\Throwable $exception, int $statusCode = null, array $headers = [])
     {
         $e = new static();
         $e->setMessage($exception->getMessage());
@@ -41,6 +56,8 @@ class FlattenException
         if ($exception instanceof HttpExceptionInterface) {
             $statusCode = $exception->getStatusCode();
             $headers = array_merge($headers, $exception->getHeaders());
+        } elseif ($exception instanceof RequestExceptionInterface) {
+            $statusCode = 400;
         }
 
         if (null === $statusCode) {
@@ -49,17 +66,15 @@ class FlattenException
 
         $e->setStatusCode($statusCode);
         $e->setHeaders($headers);
-        $e->setTraceFromException($exception);
-        $e->setClass(get_class($exception));
+        $e->setTraceFromThrowable($exception);
+        $e->setClass($exception instanceof FatalThrowableError ? $exception->getOriginalClassName() : \get_class($exception));
         $e->setFile($exception->getFile());
         $e->setLine($exception->getLine());
 
         $previous = $exception->getPrevious();
 
-        if ($previous instanceof \Exception) {
-            $e->setPrevious(static::create($previous));
-        } elseif ($previous instanceof \Throwable) {
-            $e->setPrevious(static::create(new FatalThrowableError($previous)));
+        if ($previous instanceof \Throwable) {
+            $e->setPrevious(static::createFromThrowable($previous));
         }
 
         return $e;
@@ -67,13 +82,13 @@ class FlattenException
 
     public function toArray()
     {
-        $exceptions = array();
-        foreach (array_merge(array($this), $this->getAllPrevious()) as $exception) {
-            $exceptions[] = array(
+        $exceptions = [];
+        foreach (array_merge([$this], $this->getAllPrevious()) as $exception) {
+            $exceptions[] = [
                 'message' => $exception->getMessage(),
                 'class' => $exception->getClass(),
                 'trace' => $exception->getTrace(),
-            );
+            ];
         }
 
         return $exceptions;
@@ -84,9 +99,14 @@ class FlattenException
         return $this->statusCode;
     }
 
+    /**
+     * @return $this
+     */
     public function setStatusCode($code)
     {
         $this->statusCode = $code;
+
+        return $this;
     }
 
     public function getHeaders()
@@ -94,9 +114,14 @@ class FlattenException
         return $this->headers;
     }
 
+    /**
+     * @return $this
+     */
     public function setHeaders(array $headers)
     {
         $this->headers = $headers;
+
+        return $this;
     }
 
     public function getClass()
@@ -104,9 +129,14 @@ class FlattenException
         return $this->class;
     }
 
+    /**
+     * @return $this
+     */
     public function setClass($class)
     {
-        $this->class = $class;
+        $this->class = false !== strpos($class, "@anonymous\0") ? (get_parent_class($class) ?: key(class_implements($class)) ?: 'class').'@anonymous' : $class;
+
+        return $this;
     }
 
     public function getFile()
@@ -114,9 +144,14 @@ class FlattenException
         return $this->file;
     }
 
+    /**
+     * @return $this
+     */
     public function setFile($file)
     {
         $this->file = $file;
+
+        return $this;
     }
 
     public function getLine()
@@ -124,9 +159,14 @@ class FlattenException
         return $this->line;
     }
 
+    /**
+     * @return $this
+     */
     public function setLine($line)
     {
         $this->line = $line;
+
+        return $this;
     }
 
     public function getMessage()
@@ -134,9 +174,20 @@ class FlattenException
         return $this->message;
     }
 
+    /**
+     * @return $this
+     */
     public function setMessage($message)
     {
+        if (false !== strpos($message, "@anonymous\0")) {
+            $message = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
+                return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
+            }, $message);
+        }
+
         $this->message = $message;
+
+        return $this;
     }
 
     public function getCode()
@@ -144,9 +195,14 @@ class FlattenException
         return $this->code;
     }
 
+    /**
+     * @return $this
+     */
     public function setCode($code)
     {
         $this->code = $code;
+
+        return $this;
     }
 
     public function getPrevious()
@@ -154,14 +210,19 @@ class FlattenException
         return $this->previous;
     }
 
-    public function setPrevious(FlattenException $previous)
+    /**
+     * @return $this
+     */
+    public function setPrevious(self $previous)
     {
         $this->previous = $previous;
+
+        return $this;
     }
 
     public function getAllPrevious()
     {
-        $exceptions = array();
+        $exceptions = [];
         $e = $this;
         while ($e = $e->getPrevious()) {
             $exceptions[] = $e;
@@ -175,15 +236,30 @@ class FlattenException
         return $this->trace;
     }
 
+    /**
+     * @deprecated since 4.1, use {@see setTraceFromThrowable()} instead.
+     */
     public function setTraceFromException(\Exception $exception)
     {
-        $this->setTrace($exception->getTrace(), $exception->getFile(), $exception->getLine());
+        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.1, use "setTraceFromThrowable()" instead.', __METHOD__), \E_USER_DEPRECATED);
+
+        $this->setTraceFromThrowable($exception);
     }
 
+    public function setTraceFromThrowable(\Throwable $throwable)
+    {
+        $this->traceAsString = $throwable->getTraceAsString();
+
+        return $this->setTrace($throwable->getTrace(), $throwable->getFile(), $throwable->getLine());
+    }
+
+    /**
+     * @return $this
+     */
     public function setTrace($trace, $file, $line)
     {
-        $this->trace = array();
-        $this->trace[] = array(
+        $this->trace = [];
+        $this->trace[] = [
             'namespace' => '',
             'short_class' => '',
             'class' => '',
@@ -191,8 +267,8 @@ class FlattenException
             'function' => '',
             'file' => $file,
             'line' => $line,
-            'args' => array(),
-        );
+            'args' => [],
+        ];
         foreach ($trace as $entry) {
             $class = '';
             $namespace = '';
@@ -202,59 +278,90 @@ class FlattenException
                 $namespace = implode('\\', $parts);
             }
 
-            $this->trace[] = array(
+            $this->trace[] = [
                 'namespace' => $namespace,
                 'short_class' => $class,
-                'class' => isset($entry['class']) ? $entry['class'] : '',
-                'type' => isset($entry['type']) ? $entry['type'] : '',
-                'function' => isset($entry['function']) ? $entry['function'] : null,
-                'file' => isset($entry['file']) ? $entry['file'] : null,
-                'line' => isset($entry['line']) ? $entry['line'] : null,
-                'args' => isset($entry['args']) ? $this->flattenArgs($entry['args']) : array(),
-            );
+                'class' => $entry['class'] ?? '',
+                'type' => $entry['type'] ?? '',
+                'function' => $entry['function'] ?? null,
+                'file' => $entry['file'] ?? null,
+                'line' => $entry['line'] ?? null,
+                'args' => isset($entry['args']) ? $this->flattenArgs($entry['args']) : [],
+            ];
         }
+
+        return $this;
     }
 
-    private function flattenArgs($args, $level = 0, &$count = 0)
+    private function flattenArgs(array $args, int $level = 0, int &$count = 0): array
     {
-        $result = array();
+        $result = [];
         foreach ($args as $key => $value) {
             if (++$count > 1e4) {
-                return array('array', '*SKIPPED over 10000 entries*');
+                return ['array', '*SKIPPED over 10000 entries*'];
             }
             if ($value instanceof \__PHP_Incomplete_Class) {
                 // is_object() returns false on PHP<=7.1
-                $result[$key] = array('incomplete-object', $this->getClassNameFromIncomplete($value));
-            } elseif (is_object($value)) {
-                $result[$key] = array('object', get_class($value));
-            } elseif (is_array($value)) {
+                $result[$key] = ['incomplete-object', $this->getClassNameFromIncomplete($value)];
+            } elseif (\is_object($value)) {
+                $result[$key] = ['object', \get_class($value)];
+            } elseif (\is_array($value)) {
                 if ($level > 10) {
-                    $result[$key] = array('array', '*DEEP NESTED ARRAY*');
+                    $result[$key] = ['array', '*DEEP NESTED ARRAY*'];
                 } else {
-                    $result[$key] = array('array', $this->flattenArgs($value, $level + 1, $count));
+                    $result[$key] = ['array', $this->flattenArgs($value, $level + 1, $count)];
                 }
             } elseif (null === $value) {
-                $result[$key] = array('null', null);
-            } elseif (is_bool($value)) {
-                $result[$key] = array('boolean', $value);
-            } elseif (is_int($value)) {
-                $result[$key] = array('integer', $value);
-            } elseif (is_float($value)) {
-                $result[$key] = array('float', $value);
-            } elseif (is_resource($value)) {
-                $result[$key] = array('resource', get_resource_type($value));
+                $result[$key] = ['null', null];
+            } elseif (\is_bool($value)) {
+                $result[$key] = ['boolean', $value];
+            } elseif (\is_int($value)) {
+                $result[$key] = ['integer', $value];
+            } elseif (\is_float($value)) {
+                $result[$key] = ['float', $value];
+            } elseif (\is_resource($value)) {
+                $result[$key] = ['resource', get_resource_type($value)];
             } else {
-                $result[$key] = array('string', (string) $value);
+                $result[$key] = ['string', (string) $value];
             }
         }
 
         return $result;
     }
 
-    private function getClassNameFromIncomplete(\__PHP_Incomplete_Class $value)
+    private function getClassNameFromIncomplete(\__PHP_Incomplete_Class $value): string
     {
         $array = new \ArrayObject($value);
 
         return $array['__PHP_Incomplete_Class_Name'];
     }
+
+    public function getTraceAsString()
+    {
+        return $this->traceAsString;
+    }
+
+    public function getAsString()
+    {
+        $message = '';
+        $next = false;
+
+        foreach (array_reverse(array_merge([$this], $this->getAllPrevious())) as $exception) {
+            if ($next) {
+                $message .= 'Next ';
+            } else {
+                $next = true;
+            }
+            $message .= $exception->getClass();
+
+            if ('' != $exception->getMessage()) {
+                $message .= ': '.$exception->getMessage();
+            }
+
+            $message .= ' in '.$exception->getFile().':'.$exception->getLine().
+                "\nStack trace:\n".$exception->getTraceAsString()."\n\n";
+        }
+
+        return rtrim($message);
+    }
 }

Exception/OutOfMemoryException.php

@@ -11,10 +11,14 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', OutOfMemoryException::class, \Symfony\Component\ErrorHandler\Error\OutOfMemoryError::class), \E_USER_DEPRECATED);
+
 /**
  * Out of memory exception.
  *
  * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Error\OutOfMemoryError instead.
  */
 class OutOfMemoryException extends FatalErrorException
 {

Exception/SilencedErrorContext.php

@@ -11,22 +11,31 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', SilencedErrorContext::class, \Symfony\Component\ErrorHandler\Exception\SilencedErrorContext::class), \E_USER_DEPRECATED);
+
 /**
  * Data Object that represents a Silenced Error.
  *
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Exception\SilencedErrorContext instead.
  */
 class SilencedErrorContext implements \JsonSerializable
 {
+    public $count = 1;
+
     private $severity;
     private $file;
     private $line;
+    private $trace;
 
-    public function __construct($severity, $file, $line)
+    public function __construct(int $severity, string $file, int $line, array $trace = [], int $count = 1)
     {
         $this->severity = $severity;
         $this->file = $file;
         $this->line = $line;
+        $this->trace = $trace;
+        $this->count = $count;
     }
 
     public function getSeverity()
@@ -44,12 +53,19 @@ class SilencedErrorContext implements \JsonSerializable
         return $this->line;
     }
 
-    public function JsonSerialize()
+    public function getTrace()
     {
-        return array(
+        return $this->trace;
+    }
+
+    public function jsonSerialize()
+    {
+        return [
             'severity' => $this->severity,
             'file' => $this->file,
             'line' => $this->line,
-        );
+            'trace' => $this->trace,
+            'count' => $this->count,
+        ];
     }
 }

Exception/UndefinedFunctionException.php

@@ -11,14 +11,18 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', UndefinedFunctionException::class, \Symfony\Component\ErrorHandler\Error\UndefinedFunctionError::class), \E_USER_DEPRECATED);
+
 /**
  * Undefined Function Exception.
  *
  * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Error\UndefinedFunctionError instead.
  */
 class UndefinedFunctionException extends FatalErrorException
 {
-    public function __construct($message, \ErrorException $previous)
+    public function __construct(string $message, \ErrorException $previous)
     {
         parent::__construct(
             $message,
@@ -26,6 +30,9 @@ class UndefinedFunctionException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

Exception/UndefinedMethodException.php

@@ -11,14 +11,18 @@
 
 namespace Symfony\Component\Debug\Exception;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', UndefinedMethodException::class, \Symfony\Component\ErrorHandler\Error\UndefinedMethodError::class), \E_USER_DEPRECATED);
+
 /**
  * Undefined Method Exception.
  *
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\Error\UndefinedMethodError instead.
  */
 class UndefinedMethodException extends FatalErrorException
 {
-    public function __construct($message, \ErrorException $previous)
+    public function __construct(string $message, \ErrorException $previous)
     {
         parent::__construct(
             $message,
@@ -26,6 +30,9 @@ class UndefinedMethodException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

FatalErrorHandler/ClassNotFoundFatalErrorHandler.php

@@ -11,16 +11,20 @@
 
 namespace Symfony\Component\Debug\FatalErrorHandler;
 
-use Symfony\Component\Debug\Exception\ClassNotFoundException;
-use Symfony\Component\Debug\Exception\FatalErrorException;
-use Symfony\Component\Debug\DebugClassLoader;
 use Composer\Autoload\ClassLoader as ComposerClassLoader;
 use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
+use Symfony\Component\Debug\DebugClassLoader;
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', ClassNotFoundFatalErrorHandler::class, \Symfony\Component\ErrorHandler\FatalErrorHandler\ClassNotFoundFatalErrorHandler::class), \E_USER_DEPRECATED);
 
 /**
  * ErrorHandler for classes that do not exist.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\FatalErrorHandler\ClassNotFoundFatalErrorHandler instead.
  */
 class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
 {
@@ -29,48 +33,34 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     public function handleError(array $error, FatalErrorException $exception)
     {
-        $messageLen = strlen($error['message']);
-        $notFoundSuffix = '\' not found';
-        $notFoundSuffixLen = strlen($notFoundSuffix);
-        if ($notFoundSuffixLen > $messageLen) {
-            return;
+        if (!preg_match('/^(Class|Interface|Trait) [\'"]([^\'"]+)[\'"] not found$/', $error['message'], $matches)) {
+            return null;
+        }
+        $typeName = strtolower($matches[1]);
+        $fullyQualifiedClassName = $matches[2];
+
+        if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedClassName, '\\')) {
+            $className = substr($fullyQualifiedClassName, $namespaceSeparatorIndex + 1);
+            $namespacePrefix = substr($fullyQualifiedClassName, 0, $namespaceSeparatorIndex);
+            $message = sprintf('Attempted to load %s "%s" from namespace "%s".', $typeName, $className, $namespacePrefix);
+            $tail = ' for another namespace?';
+        } else {
+            $className = $fullyQualifiedClassName;
+            $message = sprintf('Attempted to load %s "%s" from the global namespace.', $typeName, $className);
+            $tail = '?';
         }
 
-        if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
-            return;
-        }
-
-        foreach (array('class', 'interface', 'trait') as $typeName) {
-            $prefix = ucfirst($typeName).' \'';
-            $prefixLen = strlen($prefix);
-            if (0 !== strpos($error['message'], $prefix)) {
-                continue;
-            }
-
-            $fullyQualifiedClassName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
-            if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedClassName, '\\')) {
-                $className = substr($fullyQualifiedClassName, $namespaceSeparatorIndex + 1);
-                $namespacePrefix = substr($fullyQualifiedClassName, 0, $namespaceSeparatorIndex);
-                $message = sprintf('Attempted to load %s "%s" from namespace "%s".', $typeName, $className, $namespacePrefix);
-                $tail = ' for another namespace?';
+        if ($candidates = $this->getClassCandidates($className)) {
+            $tail = array_pop($candidates).'"?';
+            if ($candidates) {
+                $tail = ' for e.g. "'.implode('", "', $candidates).'" or "'.$tail;
             } else {
-                $className = $fullyQualifiedClassName;
-                $message = sprintf('Attempted to load %s "%s" from the global namespace.', $typeName, $className);
-                $tail = '?';
+                $tail = ' for "'.$tail;
             }
-
-            if ($candidates = $this->getClassCandidates($className)) {
-                $tail = array_pop($candidates).'"?';
-                if ($candidates) {
-                    $tail = ' for e.g. "'.implode('", "', $candidates).'" or "'.$tail;
-                } else {
-                    $tail = ' for "'.$tail;
-                }
-            }
-            $message .= "\nDid you forget a \"use\" statement".$tail;
-
-            return new ClassNotFoundException($message, $exception);
         }
+        $message .= "\nDid you forget a \"use\" statement".$tail;
+
+        return new ClassNotFoundException($message, $exception);
     }
 
     /**
@@ -83,24 +73,24 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      *
      * @return array An array of possible fully qualified class names
      */
-    private function getClassCandidates($class)
+    private function getClassCandidates(string $class): array
     {
-        if (!is_array($functions = spl_autoload_functions())) {
-            return array();
+        if (!\is_array($functions = spl_autoload_functions())) {
+            return [];
         }
 
         // find Symfony and Composer autoloaders
-        $classes = array();
+        $classes = [];
 
         foreach ($functions as $function) {
-            if (!is_array($function)) {
+            if (!\is_array($function)) {
                 continue;
             }
             // get class loaders wrapped by DebugClassLoader
             if ($function[0] instanceof DebugClassLoader) {
                 $function = $function[0]->getClassLoader();
 
-                if (!is_array($function)) {
+                if (!\is_array($function)) {
                     continue;
                 }
             }
@@ -124,20 +114,13 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
         return array_unique($classes);
     }
 
-    /**
-     * @param string $path
-     * @param string $class
-     * @param string $prefix
-     *
-     * @return array
-     */
-    private function findClassInPath($path, $class, $prefix)
+    private function findClassInPath(string $path, string $class, string $prefix): array
     {
-        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
-            return array();
+        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.\dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
+            return [];
         }
 
-        $classes = array();
+        $classes = [];
         $filename = $class.'.php';
         foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($path, \RecursiveDirectoryIterator::SKIP_DOTS), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
             if ($filename == $file->getFileName() && $class = $this->convertFileToClass($path, $file->getPathName(), $prefix)) {
@@ -148,18 +131,11 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
         return $classes;
     }
 
-    /**
-     * @param string $path
-     * @param string $file
-     * @param string $prefix
-     *
-     * @return string|null
-     */
-    private function convertFileToClass($path, $file, $prefix)
+    private function convertFileToClass(string $path, string $file, string $prefix): ?string
     {
-        $candidates = array(
+        $candidates = [
             // namespaced class
-            $namespacedClass = str_replace(array($path.DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            $namespacedClass = str_replace([$path.\DIRECTORY_SEPARATOR, '.php', '/'], ['', '', '\\'], $file),
             // namespaced class (with target dir)
             $prefix.$namespacedClass,
             // namespaced class (with target dir and separator)
@@ -170,7 +146,7 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
             str_replace('\\', '_', $prefix.$namespacedClass),
             // PEAR class (with target dir and separator)
             str_replace('\\', '_', $prefix.'\\'.$namespacedClass),
-        );
+        ];
 
         if ($prefix) {
             $candidates = array_filter($candidates, function ($candidate) use ($prefix) { return 0 === strpos($candidate, $prefix); });
@@ -185,21 +161,22 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
             }
         }
 
-        require_once $file;
+        try {
+            require_once $file;
+        } catch (\Throwable $e) {
+            return null;
+        }
 
         foreach ($candidates as $candidate) {
             if ($this->classExists($candidate)) {
                 return $candidate;
             }
         }
+
+        return null;
     }
 
-    /**
-     * @param string $class
-     *
-     * @return bool
-     */
-    private function classExists($class)
+    private function classExists(string $class): bool
     {
         return class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
     }

FatalErrorHandler/FatalErrorHandlerInterface.php

@@ -13,18 +13,21 @@ namespace Symfony\Component\Debug\FatalErrorHandler;
 
 use Symfony\Component\Debug\Exception\FatalErrorException;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', FatalErrorHandlerInterface::class, \Symfony\Component\ErrorHandler\FatalErrorHandler\FatalErrorHandlerInterface::class), \E_USER_DEPRECATED);
+
 /**
  * Attempts to convert fatal errors to exceptions.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\FatalErrorHandler\FatalErrorHandlerInterface instead.
  */
 interface FatalErrorHandlerInterface
 {
     /**
      * Attempts to convert an error into an exception.
      *
-     * @param array               $error     An array as returned by error_get_last()
-     * @param FatalErrorException $exception A FatalErrorException instance
+     * @param array $error An array as returned by error_get_last()
      *
      * @return FatalErrorException|null A FatalErrorException instance if the class is able to convert the error, null otherwise
      */

FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php

@@ -11,13 +11,17 @@
 
 namespace Symfony\Component\Debug\FatalErrorHandler;
 
-use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedFunctionException;
+
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', UndefinedFunctionFatalErrorHandler::class, \Symfony\Component\ErrorHandler\ErrorEnhancer\UndefinedFunctionErrorEnhancer::class), \E_USER_DEPRECATED);
 
 /**
  * ErrorHandler for undefined functions.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\ErrorEnhancer\UndefinedFunctionErrorEnhancer instead.
  */
 class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
 {
@@ -26,21 +30,21 @@ class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
      */
     public function handleError(array $error, FatalErrorException $exception)
     {
-        $messageLen = strlen($error['message']);
+        $messageLen = \strlen($error['message']);
         $notFoundSuffix = '()';
-        $notFoundSuffixLen = strlen($notFoundSuffix);
+        $notFoundSuffixLen = \strlen($notFoundSuffix);
         if ($notFoundSuffixLen > $messageLen) {
-            return;
+            return null;
         }
 
         if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
-            return;
+            return null;
         }
 
         $prefix = 'Call to undefined function ';
-        $prefixLen = strlen($prefix);
+        $prefixLen = \strlen($prefix);
         if (0 !== strpos($error['message'], $prefix)) {
-            return;
+            return null;
         }
 
         $fullyQualifiedFunctionName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
@@ -53,7 +57,7 @@ class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
             $message = sprintf('Attempted to call function "%s" from the global namespace.', $functionName);
         }
 
-        $candidates = array();
+        $candidates = [];
         foreach (get_defined_functions() as $type => $definedFunctionNames) {
             foreach ($definedFunctionNames as $definedFunctionName) {
                 if (false !== $namespaceSeparatorIndex = strrpos($definedFunctionName, '\\')) {

FatalErrorHandler/UndefinedMethodFatalErrorHandler.php

@@ -14,10 +14,14 @@ namespace Symfony\Component\Debug\FatalErrorHandler;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\Exception\UndefinedMethodException;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.4, use "%s" instead.', UndefinedMethodFatalErrorHandler::class, \Symfony\Component\ErrorHandler\ErrorEnhancer\UndefinedMethodErrorEnhancer::class), \E_USER_DEPRECATED);
+
 /**
  * ErrorHandler for undefined methods.
  *
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ *
+ * @deprecated since Symfony 4.4, use Symfony\Component\ErrorHandler\ErrorEnhancer\UndefinedMethodErrorEnhancer instead.
  */
 class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
 {
@@ -28,7 +32,7 @@ class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
     {
         preg_match('/^Call to undefined method (.*)::(.*)\(\)$/', $error['message'], $matches);
         if (!$matches) {
-            return;
+            return null;
         }
 
         $className = $matches[1];
@@ -36,15 +40,15 @@ class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
 
         $message = sprintf('Attempted to call an undefined method named "%s" of class "%s".', $methodName, $className);
 
-        if (!class_exists($className) || null === $methods = get_class_methods($className)) {
+        if ('' === $methodName || !class_exists($className) || null === $methods = get_class_methods($className)) {
             // failed to get the class or its methods on which an unknown method was called (for example on an anonymous class)
             return new UndefinedMethodException($message, $exception);
         }
 
-        $candidates = array();
+        $candidates = [];
         foreach ($methods as $definedMethodName) {
             $lev = levenshtein($methodName, $definedMethodName);
-            if ($lev <= strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
+            if ($lev <= \strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
                 $candidates[] = $definedMethodName;
             }
         }

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2017 Fabien Potencier
+Copyright (c) 2004-2022 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,13 +1,30 @@
 Debug Component
 ===============
 
+**CAUTION**: this component is deprecated since Symfony 4.4. Instead, use the
+[ErrorHandler component](https://github.com/symfony/symfony/tree/master/src/Symfony/Component/ErrorHandler).
+
+-----
+
 The Debug component provides tools to ease debugging PHP code.
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/debug
+```
+
+```php
+use Symfony\Component\Debug\Debug;
+
+Debug::enable();
+```
+
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/debug/index.html)
-  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
-  * [Report issues](https://github.com/symfony/symfony/issues) and
-    [send Pull Requests](https://github.com/symfony/symfony/pulls)
-    in the [main Symfony repository](https://github.com/symfony/symfony)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)

Resources/ext/README.md

@@ -1,134 +0,0 @@
-Symfony Debug Extension for PHP 5
-=================================
-
-This extension publishes several functions to help building powerful debugging tools.
-It is compatible with PHP 5.3, 5.4, 5.5 and 5.6; with ZTS and non-ZTS modes.
-It is not required thus not provided for PHP 7.
-
-symfony_zval_info()
--------------------
-
-- exposes zval_hash/refcounts, allowing e.g. efficient exploration of arbitrary structures in PHP,
-- does work with references, preventing memory copying.
-
-Its behavior is about the same as:
-
-```php
-<?php
-
-function symfony_zval_info($key, $array, $options = 0)
-{
-
-    // $options is currently not used, but could be in future version.
-
-    if (!array_key_exists($key, $array)) {
-        return null;
-    }
-
-    $info = array(
-        'type' => gettype($array[$key]),
-        'zval_hash' => /* hashed memory address of $array[$key] */,
-        'zval_refcount' => /* internal zval refcount of $array[$key] */,
-        'zval_isref' => /* is_ref status of $array[$key] */,
-    );
-
-    switch ($info['type']) {
-        case 'object':
-            $info += array(
-                'object_class' => get_class($array[$key]),
-                'object_refcount' => /* internal object refcount of $array[$key] */,
-                'object_hash' => spl_object_hash($array[$key]),
-                'object_handle' => /* internal object handle $array[$key] */,
-            );
-            break;
-
-        case 'resource':
-            $info += array(
-                'resource_handle' => (int) $array[$key],
-                'resource_type' => get_resource_type($array[$key]),
-                'resource_refcount' => /* internal resource refcount of $array[$key] */,
-            );
-            break;
-
-        case 'array':
-            $info += array(
-                'array_count' => count($array[$key]),
-            );
-            break;
-
-        case 'string':
-            $info += array(
-                'strlen' => strlen($array[$key]),
-            );
-            break;
-    }
-
-    return $info;
-}
-```
-
-symfony_debug_backtrace()
--------------------------
-
-This function works like debug_backtrace(), except that it can fetch the full backtrace in case of fatal errors:
-
-```php
-function foo() { fatal(); }
-function bar() { foo(); }
-
-function sd() { var_dump(symfony_debug_backtrace()); }
-
-register_shutdown_function('sd');
-
-bar();
-
-/* Will output
-Fatal error: Call to undefined function fatal() in foo.php on line 42
-array(3) {
-  [0]=>
-  array(2) {
-    ["function"]=>
-    string(2) "sd"
-    ["args"]=>
-    array(0) {
-    }
-  }
-  [1]=>
-  array(4) {
-    ["file"]=>
-    string(7) "foo.php"
-    ["line"]=>
-    int(1)
-    ["function"]=>
-    string(3) "foo"
-    ["args"]=>
-    array(0) {
-    }
-  }
-  [2]=>
-  array(4) {
-    ["file"]=>
-    string(102) "foo.php"
-    ["line"]=>
-    int(2)
-    ["function"]=>
-    string(3) "bar"
-    ["args"]=>
-    array(0) {
-    }
-  }
-}
-*/
-```
-
-Usage
------
-
-To enable the extension from source, run:
-
-```
-    phpize
-    ./configure
-    make
-    sudo make install
-```

Resources/ext/config.m4

@@ -1,63 +0,0 @@
-dnl $Id$
-dnl config.m4 for extension symfony_debug
-
-dnl Comments in this file start with the string 'dnl'.
-dnl Remove where necessary. This file will not work
-dnl without editing.
-
-dnl If your extension references something external, use with:
-
-dnl PHP_ARG_WITH(symfony_debug, for symfony_debug support,
-dnl Make sure that the comment is aligned:
-dnl [  --with-symfony_debug             Include symfony_debug support])
-
-dnl Otherwise use enable:
-
-PHP_ARG_ENABLE(symfony_debug, whether to enable symfony_debug support,
-dnl Make sure that the comment is aligned:
-[  --enable-symfony_debug           Enable symfony_debug support])
-
-if test "$PHP_SYMFONY_DEBUG" != "no"; then
-  dnl Write more examples of tests here...
-
-  dnl # --with-symfony_debug -> check with-path
-  dnl SEARCH_PATH="/usr/local /usr"     # you might want to change this
-  dnl SEARCH_FOR="/include/symfony_debug.h"  # you most likely want to change this
-  dnl if test -r $PHP_SYMFONY_DEBUG/$SEARCH_FOR; then # path given as parameter
-  dnl   SYMFONY_DEBUG_DIR=$PHP_SYMFONY_DEBUG
-  dnl else # search default path list
-  dnl   AC_MSG_CHECKING([for symfony_debug files in default path])
-  dnl   for i in $SEARCH_PATH ; do
-  dnl     if test -r $i/$SEARCH_FOR; then
-  dnl       SYMFONY_DEBUG_DIR=$i
-  dnl       AC_MSG_RESULT(found in $i)
-  dnl     fi
-  dnl   done
-  dnl fi
-  dnl
-  dnl if test -z "$SYMFONY_DEBUG_DIR"; then
-  dnl   AC_MSG_RESULT([not found])
-  dnl   AC_MSG_ERROR([Please reinstall the symfony_debug distribution])
-  dnl fi
-
-  dnl # --with-symfony_debug -> add include path
-  dnl PHP_ADD_INCLUDE($SYMFONY_DEBUG_DIR/include)
-
-  dnl # --with-symfony_debug -> check for lib and symbol presence
-  dnl LIBNAME=symfony_debug # you may want to change this
-  dnl LIBSYMBOL=symfony_debug # you most likely want to change this 
-
-  dnl PHP_CHECK_LIBRARY($LIBNAME,$LIBSYMBOL,
-  dnl [
-  dnl   PHP_ADD_LIBRARY_WITH_PATH($LIBNAME, $SYMFONY_DEBUG_DIR/lib, SYMFONY_DEBUG_SHARED_LIBADD)
-  dnl   AC_DEFINE(HAVE_SYMFONY_DEBUGLIB,1,[ ])
-  dnl ],[
-  dnl   AC_MSG_ERROR([wrong symfony_debug lib version or lib not found])
-  dnl ],[
-  dnl   -L$SYMFONY_DEBUG_DIR/lib -lm
-  dnl ])
-  dnl
-  dnl PHP_SUBST(SYMFONY_DEBUG_SHARED_LIBADD)
-
-  PHP_NEW_EXTENSION(symfony_debug, symfony_debug.c, $ext_shared)
-fi

Resources/ext/config.w32

@@ -1,13 +0,0 @@
-// $Id$
-// vim:ft=javascript
-
-// If your extension references something external, use ARG_WITH
-// ARG_WITH("symfony_debug", "for symfony_debug support", "no");
-
-// Otherwise, use ARG_ENABLE
-// ARG_ENABLE("symfony_debug", "enable symfony_debug support", "no");
-
-if (PHP_SYMFONY_DEBUG != "no") {
-	EXTENSION("symfony_debug", "symfony_debug.c");
-}
-

Resources/ext/php_symfony_debug.h

@@ -1,60 +0,0 @@
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifndef PHP_SYMFONY_DEBUG_H
-#define PHP_SYMFONY_DEBUG_H
-
-extern zend_module_entry symfony_debug_module_entry;
-#define phpext_symfony_debug_ptr &symfony_debug_module_entry
-
-#define PHP_SYMFONY_DEBUG_VERSION "2.7"
-
-#ifdef PHP_WIN32
-#	define PHP_SYMFONY_DEBUG_API __declspec(dllexport)
-#elif defined(__GNUC__) && __GNUC__ >= 4
-#	define PHP_SYMFONY_DEBUG_API __attribute__ ((visibility("default")))
-#else
-#	define PHP_SYMFONY_DEBUG_API
-#endif
-
-#ifdef ZTS
-#include "TSRM.h"
-#endif
-
-ZEND_BEGIN_MODULE_GLOBALS(symfony_debug)
-	intptr_t req_rand_init;
-	void (*old_error_cb)(int type, const char *error_filename, const uint error_lineno, const char *format, va_list args);
-	zval *debug_bt;
-ZEND_END_MODULE_GLOBALS(symfony_debug)
-
-PHP_MINIT_FUNCTION(symfony_debug);
-PHP_MSHUTDOWN_FUNCTION(symfony_debug);
-PHP_RINIT_FUNCTION(symfony_debug);
-PHP_RSHUTDOWN_FUNCTION(symfony_debug);
-PHP_MINFO_FUNCTION(symfony_debug);
-PHP_GINIT_FUNCTION(symfony_debug);
-PHP_GSHUTDOWN_FUNCTION(symfony_debug);
-
-PHP_FUNCTION(symfony_zval_info);
-PHP_FUNCTION(symfony_debug_backtrace);
-
-static char *_symfony_debug_memory_address_hash(void * TSRMLS_DC);
-static const char *_symfony_debug_zval_type(zval *);
-static const char* _symfony_debug_get_resource_type(long TSRMLS_DC);
-static int _symfony_debug_get_resource_refcount(long TSRMLS_DC);
-
-void symfony_debug_error_cb(int type, const char *error_filename, const uint error_lineno, const char *format, va_list args);
-
-#ifdef ZTS
-#define SYMFONY_DEBUG_G(v) TSRMG(symfony_debug_globals_id, zend_symfony_debug_globals *, v)
-#else
-#define SYMFONY_DEBUG_G(v) (symfony_debug_globals.v)
-#endif
-
-#endif	/* PHP_SYMFONY_DEBUG_H */

Resources/ext/symfony_debug.c

@@ -1,283 +0,0 @@
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "php.h"
-#ifdef ZTS
-#include "TSRM.h"
-#endif
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "php_symfony_debug.h"
-#include "ext/standard/php_rand.h"
-#include "ext/standard/php_lcg.h"
-#include "ext/spl/php_spl.h"
-#include "Zend/zend_gc.h"
-#include "Zend/zend_builtin_functions.h"
-#include "Zend/zend_extensions.h" /* for ZEND_EXTENSION_API_NO */
-#include "ext/standard/php_array.h"
-#include "Zend/zend_interfaces.h"
-#include "SAPI.h"
-
-#define IS_PHP_53 ZEND_EXTENSION_API_NO == 220090626
-
-ZEND_DECLARE_MODULE_GLOBALS(symfony_debug)
-
-ZEND_BEGIN_ARG_INFO_EX(symfony_zval_arginfo, 0, 0, 2)
-	ZEND_ARG_INFO(0, key)
-	ZEND_ARG_ARRAY_INFO(0, array, 0)
-	ZEND_ARG_INFO(0, options)
-ZEND_END_ARG_INFO()
-
-const zend_function_entry symfony_debug_functions[] = {
-	PHP_FE(symfony_zval_info,	symfony_zval_arginfo)
-	PHP_FE(symfony_debug_backtrace, NULL)
-	PHP_FE_END
-};
-
-PHP_FUNCTION(symfony_debug_backtrace)
-{
-	if (zend_parse_parameters_none() == FAILURE) {
-		return;
-	}
-#if IS_PHP_53
-	zend_fetch_debug_backtrace(return_value, 1, 0 TSRMLS_CC);
-#else
-	zend_fetch_debug_backtrace(return_value, 1, 0, 0 TSRMLS_CC);
-#endif
-
-	if (!SYMFONY_DEBUG_G(debug_bt)) {
-		return;
-	}
-
-	php_array_merge(Z_ARRVAL_P(return_value), Z_ARRVAL_P(SYMFONY_DEBUG_G(debug_bt)), 0 TSRMLS_CC);
-}
-
-PHP_FUNCTION(symfony_zval_info)
-{
-	zval *key = NULL, *arg = NULL;
-	zval **data = NULL;
-	HashTable *array = NULL;
-	long options = 0;
-
-	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "zh|l", &key, &array, &options) == FAILURE) {
-		return;
-	}
-
-	switch (Z_TYPE_P(key)) {
-		case IS_STRING:
-			if (zend_symtable_find(array, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&data) == FAILURE) {
-				return;
-			}
-		break;
-		case IS_LONG:
-			if (zend_hash_index_find(array, Z_LVAL_P(key), (void **)&data)) {
-				return;
-			}
-		break;
-	}
-
-	arg = *data;
-
-	array_init(return_value);
-
-	add_assoc_string(return_value, "type", (char *)_symfony_debug_zval_type(arg), 1);
-	add_assoc_stringl(return_value, "zval_hash", _symfony_debug_memory_address_hash((void *)arg TSRMLS_CC), 16, 0);
-	add_assoc_long(return_value, "zval_refcount", Z_REFCOUNT_P(arg));
-	add_assoc_bool(return_value, "zval_isref", (zend_bool)Z_ISREF_P(arg));
-
-	if (Z_TYPE_P(arg) == IS_OBJECT) {
-		char hash[33] = {0};
-
-		php_spl_object_hash(arg, (char *)hash TSRMLS_CC);
-		add_assoc_stringl(return_value, "object_class", (char *)Z_OBJCE_P(arg)->name, Z_OBJCE_P(arg)->name_length, 1);
-		add_assoc_long(return_value, "object_refcount", EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(arg)].bucket.obj.refcount);
-		add_assoc_string(return_value, "object_hash", hash, 1);
-		add_assoc_long(return_value, "object_handle", Z_OBJ_HANDLE_P(arg));
-	} else if (Z_TYPE_P(arg) == IS_ARRAY) {
-		add_assoc_long(return_value, "array_count", zend_hash_num_elements(Z_ARRVAL_P(arg)));
-	} else if(Z_TYPE_P(arg) == IS_RESOURCE) {
-		add_assoc_long(return_value, "resource_handle", Z_LVAL_P(arg));
-		add_assoc_string(return_value, "resource_type", (char *)_symfony_debug_get_resource_type(Z_LVAL_P(arg) TSRMLS_CC), 1);
-		add_assoc_long(return_value, "resource_refcount", _symfony_debug_get_resource_refcount(Z_LVAL_P(arg) TSRMLS_CC));
-	} else if (Z_TYPE_P(arg) == IS_STRING) {
-		add_assoc_long(return_value, "strlen", Z_STRLEN_P(arg));
-	}
-}
-
-void symfony_debug_error_cb(int type, const char *error_filename, const uint error_lineno, const char *format, va_list args)
-{
-	TSRMLS_FETCH();
-	zval *retval;
-
-	switch (type) {
-		case E_ERROR:
-		case E_PARSE:
-		case E_CORE_ERROR:
-		case E_CORE_WARNING:
-		case E_COMPILE_ERROR:
-		case E_COMPILE_WARNING:
-			ALLOC_INIT_ZVAL(retval);
-#if IS_PHP_53
-			zend_fetch_debug_backtrace(retval, 1, 0 TSRMLS_CC);
-#else
-			zend_fetch_debug_backtrace(retval, 1, 0, 0 TSRMLS_CC);
-#endif
-			SYMFONY_DEBUG_G(debug_bt) = retval;
-	}
-
-	SYMFONY_DEBUG_G(old_error_cb)(type, error_filename, error_lineno, format, args);
-}
-
-static const char* _symfony_debug_get_resource_type(long rsid TSRMLS_DC)
-{
-	const char *res_type;
-	res_type = zend_rsrc_list_get_rsrc_type(rsid TSRMLS_CC);
-
-	if (!res_type) {
-		return "Unknown";
-	}
-
-	return res_type;
-}
-
-static int _symfony_debug_get_resource_refcount(long rsid TSRMLS_DC)
-{
-	zend_rsrc_list_entry *le;
-
-	if (zend_hash_index_find(&EG(regular_list), rsid, (void **) &le)==SUCCESS) {
-		return le->refcount;
-	}
-
-	return 0;
-}
-
-static char *_symfony_debug_memory_address_hash(void *address TSRMLS_DC)
-{
-	char *result = NULL;
-	intptr_t address_rand;
-
-	if (!SYMFONY_DEBUG_G(req_rand_init)) {
-		if (!BG(mt_rand_is_seeded)) {
-			php_mt_srand(GENERATE_SEED() TSRMLS_CC);
-		}
-		SYMFONY_DEBUG_G(req_rand_init) = (intptr_t)php_mt_rand(TSRMLS_C);
-	}
-
-	address_rand = (intptr_t)address ^ SYMFONY_DEBUG_G(req_rand_init);
-
-	spprintf(&result, 17, "%016zx", address_rand);
-
-	return result;
-}
-
-static const char *_symfony_debug_zval_type(zval *zv)
-{
-	switch (Z_TYPE_P(zv)) {
-		case IS_NULL:
-			return "NULL";
-			break;
-
-		case IS_BOOL:
-			return "boolean";
-			break;
-
-		case IS_LONG:
-			return "integer";
-			break;
-
-		case IS_DOUBLE:
-			return "double";
-			break;
-
-		case IS_STRING:
-			return "string";
-			break;
-
-		case IS_ARRAY:
-			return "array";
-			break;
-
-		case IS_OBJECT:
-			return "object";
-
-		case IS_RESOURCE:
-			return "resource";
-
-		default:
-			return "unknown type";
-	}
-}
-
-zend_module_entry symfony_debug_module_entry = {
-	STANDARD_MODULE_HEADER,
-	"symfony_debug",
-	symfony_debug_functions,
-	PHP_MINIT(symfony_debug),
-	PHP_MSHUTDOWN(symfony_debug),
-	PHP_RINIT(symfony_debug),
-	PHP_RSHUTDOWN(symfony_debug),
-	PHP_MINFO(symfony_debug),
-	PHP_SYMFONY_DEBUG_VERSION,
-	PHP_MODULE_GLOBALS(symfony_debug),
-	PHP_GINIT(symfony_debug),
-	PHP_GSHUTDOWN(symfony_debug),
-	NULL,
-	STANDARD_MODULE_PROPERTIES_EX
-};
-
-#ifdef COMPILE_DL_SYMFONY_DEBUG
-ZEND_GET_MODULE(symfony_debug)
-#endif
-
-PHP_GINIT_FUNCTION(symfony_debug)
-{
-	memset(symfony_debug_globals, 0 , sizeof(*symfony_debug_globals));
-}
-
-PHP_GSHUTDOWN_FUNCTION(symfony_debug)
-{
-
-}
-
-PHP_MINIT_FUNCTION(symfony_debug)
-{
-	SYMFONY_DEBUG_G(old_error_cb) = zend_error_cb;
-	zend_error_cb                 = symfony_debug_error_cb;
-
-	return SUCCESS;
-}
-
-PHP_MSHUTDOWN_FUNCTION(symfony_debug)
-{
-	zend_error_cb = SYMFONY_DEBUG_G(old_error_cb);
-
-	return SUCCESS;
-}
-
-PHP_RINIT_FUNCTION(symfony_debug)
-{
-	return SUCCESS;
-}
-
-PHP_RSHUTDOWN_FUNCTION(symfony_debug)
-{
-	return SUCCESS;
-}
-
-PHP_MINFO_FUNCTION(symfony_debug)
-{
-	php_info_print_table_start();
-	php_info_print_table_header(2, "Symfony Debug support", "enabled");
-	php_info_print_table_header(2, "Symfony Debug version", PHP_SYMFONY_DEBUG_VERSION);
-	php_info_print_table_end();
-}

Resources/ext/tests/001.phpt

@@ -1,153 +0,0 @@
---TEST--
-Test symfony_zval_info API
---SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
---FILE--
-<?php
-
-$int = 42;
-$float = 42.42;
-$str = 'foobar';
-$object = new StdClass();
-$array = array('foo', 'bar');
-$resource = tmpfile();
-$null = null;
-$bool = true;
-
-$anotherint = 42;
-$refcount2 = &$anotherint;
-
-$var = array(
-    'int' => $int,
-    'float' => $float,
-    'str' => $str,
-    'object' => $object,
-    'array' => $array,
-    'resource' => $resource,
-    'null' => $null,
-    'bool' => $bool,
-    'refcount' => &$refcount2,
-);
-
-var_dump(symfony_zval_info('int', $var));
-var_dump(symfony_zval_info('float', $var));
-var_dump(symfony_zval_info('str', $var));
-var_dump(symfony_zval_info('object', $var));
-var_dump(symfony_zval_info('array', $var));
-var_dump(symfony_zval_info('resource', $var));
-var_dump(symfony_zval_info('null', $var));
-var_dump(symfony_zval_info('bool', $var));
-
-var_dump(symfony_zval_info('refcount', $var));
-var_dump(symfony_zval_info('not-exist', $var));
-?>
---EXPECTF--
-array(4) {
-  ["type"]=>
-  string(7) "integer"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-}
-array(4) {
-  ["type"]=>
-  string(6) "double"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-}
-array(5) {
-  ["type"]=>
-  string(6) "string"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-  ["strlen"]=>
-  int(6)
-}
-array(8) {
-  ["type"]=>
-  string(6) "object"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-  ["object_class"]=>
-  string(8) "stdClass"
-  ["object_refcount"]=>
-  int(1)
-  ["object_hash"]=>
-  string(32) "%s"
-  ["object_handle"]=>
-  int(%d)
-}
-array(5) {
-  ["type"]=>
-  string(5) "array"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-  ["array_count"]=>
-  int(2)
-}
-array(7) {
-  ["type"]=>
-  string(8) "resource"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-  ["resource_handle"]=>
-  int(%d)
-  ["resource_type"]=>
-  string(6) "stream"
-  ["resource_refcount"]=>
-  int(1)
-}
-array(4) {
-  ["type"]=>
-  string(4) "NULL"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-}
-array(4) {
-  ["type"]=>
-  string(7) "boolean"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(2)
-  ["zval_isref"]=>
-  bool(false)
-}
-array(4) {
-  ["type"]=>
-  string(7) "integer"
-  ["zval_hash"]=>
-  string(16) "%s"
-  ["zval_refcount"]=>
-  int(3)
-  ["zval_isref"]=>
-  bool(true)
-}
-NULL

Resources/ext/tests/002.phpt

@@ -1,63 +0,0 @@
---TEST--
-Test symfony_debug_backtrace in case of fatal error
---SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
---FILE--
-<?php
-
-function bar()
-{
-    foo();
-}
-
-function foo()
-{
-    notexist();
-}
-
-function bt()
-{
-    print_r(symfony_debug_backtrace());
-}
-
-register_shutdown_function('bt');
-
-bar();
-
-?>
---EXPECTF--
-Fatal error: Call to undefined function notexist() in %s on line %d
-Array
-(
-    [0] => Array
-        (
-            [function] => bt
-            [args] => Array
-                (
-                )
-
-        )
-
-    [1] => Array
-        (
-            [file] => %s
-            [line] => %d
-            [function] => foo
-            [args] => Array
-                (
-                )
-
-        )
-
-    [2] => Array
-        (
-            [file] => %s
-            [line] => %d
-            [function] => bar
-            [args] => Array
-                (
-                )
-
-        )
-
-)

Resources/ext/tests/002_1.phpt

@@ -1,46 +0,0 @@
---TEST--
-Test symfony_debug_backtrace in case of non fatal error
---SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
---FILE--
-<?php
-
-function bar()
-{
-    bt();
-}
-
-function bt()
-{
-    print_r(symfony_debug_backtrace());
-}
-
-bar();
-
-?>
---EXPECTF--
-Array
-(
-    [0] => Array
-        (
-            [file] => %s
-            [line] => %d
-            [function] => bt
-            [args] => Array
-                (
-                )
-
-        )
-
-    [1] => Array
-        (
-            [file] => %s
-            [line] => %d
-            [function] => bar
-            [args] => Array
-                (
-                )
-
-        )
-
-)

Resources/ext/tests/003.phpt

@@ -1,85 +0,0 @@
---TEST--
-Test ErrorHandler in case of fatal error
---SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
---FILE--
-<?php
-
-namespace Psr\Log;
-
-class LogLevel
-{
-    const EMERGENCY = 'emergency';
-    const ALERT = 'alert';
-    const CRITICAL = 'critical';
-    const ERROR = 'error';
-    const WARNING = 'warning';
-    const NOTICE = 'notice';
-    const INFO = 'info';
-    const DEBUG = 'debug';
-}
-
-namespace Symfony\Component\Debug;
-
-$dir = __DIR__.'/../../../';
-require $dir.'ErrorHandler.php';
-require $dir.'Exception/FatalErrorException.php';
-require $dir.'Exception/UndefinedFunctionException.php';
-require $dir.'FatalErrorHandler/FatalErrorHandlerInterface.php';
-require $dir.'FatalErrorHandler/ClassNotFoundFatalErrorHandler.php';
-require $dir.'FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php';
-require $dir.'FatalErrorHandler/UndefinedMethodFatalErrorHandler.php';
-
-function bar()
-{
-    foo();
-}
-
-function foo()
-{
-    notexist();
-}
-
-$handler = ErrorHandler::register();
-$handler->setExceptionHandler('print_r');
-
-if (function_exists('xdebug_disable')) {
-    xdebug_disable();
-}
-
-bar();
-?>
---EXPECTF--
-Fatal error: Call to undefined function Symfony\Component\Debug\notexist() in %s on line %d
-Symfony\Component\Debug\Exception\UndefinedFunctionException Object
-(
-    [message:protected] => Attempted to call function "notexist" from namespace "Symfony\Component\Debug".
-    [string:Exception:private] => 
-    [code:protected] => 0
-    [file:protected] => %s
-    [line:protected] => %d
-    [trace:Exception:private] => Array
-        (
-            [0] => Array
-                (
-%A                    [function] => Symfony\Component\Debug\foo
-%A                    [args] => Array
-                        (
-                        )
-
-                )
-
-            [1] => Array
-                (
-%A                    [function] => Symfony\Component\Debug\bar
-%A                    [args] => Array
-                        (
-                        )
-
-                )
-%A
-        )
-
-    [previous:Exception:private] => 
-    [severity:protected] => 1
-)

Tests/DebugClassLoaderTest.php

@@ -12,9 +12,12 @@
 namespace Symfony\Component\Debug\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\Debug\Tests\Fixtures\ExtendsDeprecatedParent;
 use Symfony\Component\Debug\DebugClassLoader;
-use Symfony\Component\Debug\ErrorHandler;
 
+/**
+ * @group legacy
+ */
 class DebugClassLoaderTest extends TestCase
 {
     /**
@@ -24,33 +27,35 @@ class DebugClassLoaderTest extends TestCase
 
     private $loader;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->errorReporting = error_reporting(E_ALL);
-        $this->loader = new ClassLoader();
-        spl_autoload_register(array($this->loader, 'loadClass'), true, true);
-        DebugClassLoader::enable();
+        $this->loader = [new DebugClassLoader([new ClassLoader(), 'loadClass']), 'loadClass'];
+        spl_autoload_register($this->loader, true, true);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
-        DebugClassLoader::disable();
-        spl_autoload_unregister(array($this->loader, 'loadClass'));
+        spl_autoload_unregister($this->loader);
         error_reporting($this->errorReporting);
     }
 
+    /**
+     * @runInSeparateProcess
+     */
     public function testIdempotence()
     {
         DebugClassLoader::enable();
+        DebugClassLoader::enable();
 
         $functions = spl_autoload_functions();
         foreach ($functions as $function) {
-            if (is_array($function) && $function[0] instanceof DebugClassLoader) {
+            if (\is_array($function) && $function[0] instanceof DebugClassLoader) {
                 $reflClass = new \ReflectionClass($function[0]);
                 $reflProp = $reflClass->getProperty('classLoader');
                 $reflProp->setAccessible(true);
 
-                $this->assertNotInstanceOf('Symfony\Component\Debug\DebugClassLoader', $reflProp->getValue($function[0]));
+                $this->assertNotInstanceOf(DebugClassLoader::class, $reflProp->getValue($function[0]));
 
                 return;
             }
@@ -59,95 +64,43 @@ class DebugClassLoaderTest extends TestCase
         $this->fail('DebugClassLoader did not register');
     }
 
-    public function testUnsilencing()
+    public function testThrowingClass()
     {
-        if (\PHP_VERSION_ID >= 70000) {
-            $this->markTestSkipped('PHP7 throws exceptions, unsilencing is not required anymore.');
-        }
-        if (defined('HHVM_VERSION')) {
-            $this->markTestSkipped('HHVM is not handled in this test case.');
-        }
-
-        ob_start();
-
-        $this->iniSet('log_errors', 0);
-        $this->iniSet('display_errors', 1);
-
-        // See below: this will fail with parse error
-        // but this should not be @-silenced.
-        @class_exists(__NAMESPACE__.'\TestingUnsilencing', true);
-
-        $output = ob_get_clean();
-
-        $this->assertStringMatchesFormat('%aParse error%a', $output);
-    }
-
-    public function testStacking()
-    {
-        // the ContextErrorException must not be loaded to test the workaround
-        // for https://bugs.php.net/65322.
-        if (class_exists('Symfony\Component\Debug\Exception\ContextErrorException', false)) {
-            $this->markTestSkipped('The ContextErrorException class is already loaded.');
-        }
-        if (defined('HHVM_VERSION')) {
-            $this->markTestSkipped('HHVM is not handled in this test case.');
-        }
-
-        ErrorHandler::register();
-
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('boo');
         try {
-            // Trigger autoloading + E_STRICT at compile time
-            // which in turn triggers $errorHandler->handle()
-            // that again triggers autoloading for ContextErrorException.
-            // Error stacking works around the bug above and everything is fine.
-
-            eval('
-                namespace '.__NAMESPACE__.';
-                class ChildTestingStacking extends TestingStacking { function foo($bar) {} }
-            ');
-            $this->fail('ContextErrorException expected');
-        } catch (\ErrorException $exception) {
-            // if an exception is thrown, the test passed
-            $this->assertStringStartsWith(__FILE__, $exception->getFile());
-            if (\PHP_VERSION_ID < 70000) {
-                $this->assertRegExp('/^Runtime Notice: Declaration/', $exception->getMessage());
-                $this->assertEquals(E_STRICT, $exception->getSeverity());
-            } else {
-                $this->assertRegExp('/^Warning: Declaration/', $exception->getMessage());
-                $this->assertEquals(E_WARNING, $exception->getSeverity());
-            }
-        } finally {
-            restore_error_handler();
-            restore_exception_handler();
+            class_exists(Fixtures\Throwing::class);
+            $this->fail('Exception expected');
+        } catch (\Exception $e) {
+            $this->assertSame('boo', $e->getMessage());
         }
+
+        // the second call also should throw
+        class_exists(Fixtures\Throwing::class);
     }
 
-    /**
-     * @expectedException \RuntimeException
-     */
     public function testNameCaseMismatch()
     {
-        class_exists(__NAMESPACE__.'\TestingCaseMismatch', true);
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Case mismatch between loaded and declared class names');
+        class_exists(TestingCaseMismatch::class, true);
     }
 
-    /**
-     * @expectedException \RuntimeException
-     * @expectedExceptionMessage Case mismatch between class and real file names
-     */
     public function testFileCaseMismatch()
     {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Case mismatch between class and real file names');
         if (!file_exists(__DIR__.'/Fixtures/CaseMismatch.php')) {
             $this->markTestSkipped('Can only be run on case insensitive filesystems');
         }
 
-        class_exists(__NAMESPACE__.'\Fixtures\CaseMismatch', true);
+        class_exists(Fixtures\CaseMismatch::class, true);
     }
 
-    /**
-     * @expectedException \RuntimeException
-     */
     public function testPsr4CaseMismatch()
     {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Case mismatch between loaded and declared class names');
         class_exists(__NAMESPACE__.'\Fixtures\Psr4CaseMismatch', true);
     }
 
@@ -163,7 +116,7 @@ class DebugClassLoaderTest extends TestCase
 
     public function testClassAlias()
     {
-        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\ClassAlias', true));
+        $this->assertTrue(class_exists(Fixtures\ClassAlias::class, true));
     }
 
     /**
@@ -183,20 +136,20 @@ class DebugClassLoaderTest extends TestCase
         $lastError = error_get_last();
         unset($lastError['file'], $lastError['line']);
 
-        $xError = array(
+        $xError = [
             'type' => E_USER_DEPRECATED,
-            'message' => 'The Test\Symfony\Component\Debug\Tests\\'.$class.' class '.$type.' Symfony\Component\Debug\Tests\Fixtures\\'.$super.' that is deprecated but this is a test deprecation notice.',
-        );
+            'message' => 'The "Test\Symfony\Component\Debug\Tests\\'.$class.'" class '.$type.' "Symfony\Component\Debug\Tests\Fixtures\\'.$super.'" that is deprecated but this is a test deprecation notice.',
+        ];
 
         $this->assertSame($xError, $lastError);
     }
 
     public function provideDeprecatedSuper()
     {
-        return array(
-            array('DeprecatedInterfaceClass', 'DeprecatedInterface', 'implements'),
-            array('DeprecatedParentClass', 'DeprecatedClass', 'extends'),
-        );
+        return [
+            ['DeprecatedInterfaceClass', 'DeprecatedInterface', 'implements'],
+            ['DeprecatedParentClass', 'DeprecatedClass', 'extends'],
+        ];
     }
 
     public function testInterfaceExtendsDeprecatedInterface()
@@ -205,7 +158,7 @@ class DebugClassLoaderTest extends TestCase
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
-        class_exists('Test\\'.__NAMESPACE__.'\\NonDeprecatedInterfaceClass', true);
+        class_exists('Test\\'.NonDeprecatedInterfaceClass::class, true);
 
         error_reporting($e);
         restore_error_handler();
@@ -213,10 +166,10 @@ class DebugClassLoaderTest extends TestCase
         $lastError = error_get_last();
         unset($lastError['file'], $lastError['line']);
 
-        $xError = array(
+        $xError = [
             'type' => E_USER_NOTICE,
             'message' => '',
-        );
+        ];
 
         $this->assertSame($xError, $lastError);
     }
@@ -227,7 +180,7 @@ class DebugClassLoaderTest extends TestCase
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
-        class_exists('Symfony\Bridge\Debug\Tests\Fixtures\ExtendsDeprecatedParent', true);
+        class_exists(ExtendsDeprecatedParent::class, true);
 
         error_reporting($e);
         restore_error_handler();
@@ -235,25 +188,69 @@ class DebugClassLoaderTest extends TestCase
         $lastError = error_get_last();
         unset($lastError['file'], $lastError['line']);
 
-        $xError = array(
+        $xError = [
             'type' => E_USER_NOTICE,
             'message' => '',
-        );
+        ];
 
         $this->assertSame($xError, $lastError);
     }
 
-    public function testReservedForPhp7()
+    public function testExtendedFinalClass()
     {
-        if (\PHP_VERSION_ID >= 70000) {
-            $this->markTestSkipped('PHP7 already prevents using reserved names.');
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        require __DIR__.'/Fixtures/FinalClasses.php';
+
+        $i = 1;
+        while (class_exists($finalClass = Fixtures\FinalClass::class.$i++, false)) {
+            spl_autoload_call($finalClass);
+            class_exists('Test\\'.__NAMESPACE__.'\\Extends'.substr($finalClass, strrpos($finalClass, '\\') + 1), true);
         }
 
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass1" class is considered final since version 3.3. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass1".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass2" class is considered final. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass2".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass3" class is considered final comment with @@@ and ***. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass3".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass4" class is considered final. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass4".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass5" class is considered final multiline comment. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass5".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass6" class is considered final. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass6".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass7" class is considered final another multiline comment... It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass7".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass8" class is considered final. It may change without further notice as of its next major version. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsFinalClass8".',
+        ], $deprecations);
+    }
+
+    public function testExtendedFinalMethod()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists(Fixtures\ExtendedFinalMethod::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $xError = [
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod2()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".',
+        ];
+
+        $this->assertSame($xError, $deprecations);
+    }
+
+    public function testExtendedDeprecatedMethodDoesntTriggerAnyNotice()
+    {
         set_error_handler(function () { return false; });
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
-        class_exists('Test\\'.__NAMESPACE__.'\\Float', true);
+        class_exists('Test\\'.ExtendsAnnotatedClass::class, true);
 
         error_reporting($e);
         restore_error_handler();
@@ -261,12 +258,108 @@ class DebugClassLoaderTest extends TestCase
         $lastError = error_get_last();
         unset($lastError['file'], $lastError['line']);
 
-        $xError = array(
-            'type' => E_USER_DEPRECATED,
-            'message' => 'Test\Symfony\Component\Debug\Tests\Float uses a reserved class name (Float) that will break on PHP 7 and higher',
-        );
+        $this->assertSame(['type' => E_USER_NOTICE, 'message' => ''], $lastError);
+    }
 
-        $this->assertSame($xError, $lastError);
+    public function testInternalsUse()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists('Test\\'.ExtendsInternals::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame($deprecations, [
+            'The "Symfony\Component\Debug\Tests\Fixtures\InternalInterface" interface is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternalsParent".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\InternalClass" class is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternalsParent".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\InternalTrait" trait is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternals".',
+            'The "Symfony\Component\Debug\Tests\Fixtures\InternalClass::internalMethod()" method is considered internal. It may change without further notice. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsInternals".',
+        ]);
+    }
+
+    public function testExtendedMethodDefinesNewParameters()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists(Fixtures\SubClassWithAnnotatedParameters::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::quzMethod()" method will require a new "Quz $quz" argument in the next major version of its parent class "Symfony\Component\Debug\Tests\Fixtures\ClassWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::whereAmI()" method will require a new "bool $matrix" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::iAmHere()" method will require a new "$noType" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::iAmHere()" method will require a new "callable(\Throwable|null $reason, mixed $value) $callback" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::iAmHere()" method will require a new "string $param" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::iAmHere()" method will require a new "callable  ($a,  $b) $anotherOne" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::iAmHere()" method will require a new "Type$WithDollarIsStillAType $ccc" argument in the next major version of its interface "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::isSymfony()" method will require a new "true $yes" argument in the next major version of its parent class "Symfony\Component\Debug\Tests\Fixtures\ClassWithAnnotatedParameters", not defining it is deprecated.',
+        ], $deprecations);
+    }
+
+    public function testUseTraitWithInternalMethod()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists('Test\\'.UseTraitWithInternalMethod::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([], $deprecations);
+    }
+
+    public function testVirtualUse()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists('Test\\'.ExtendsVirtual::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::sameLineInterfaceMethodNoBraces()".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::newLineInterfaceMethod()": Some description!',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::newLineInterfaceMethodNoBraces()": Description.',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::invalidInterfaceMethod()".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::invalidInterfaceMethodNoBraces()".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::complexInterfaceMethod($arg, ...$args)".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::complexInterfaceMethodTyped($arg, int ...$args)": Description ...',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "static Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::staticMethodNoBraces()".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "static Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::staticMethodTyped(int $arg)": Description.',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtualParent" should implement method "static Symfony\Component\Debug\Tests\Fixtures\VirtualInterface::staticMethodTypedNoBraces()".',
+            'Class "Test\Symfony\Component\Debug\Tests\ExtendsVirtual" should implement method "Symfony\Component\Debug\Tests\Fixtures\VirtualSubInterface::subInterfaceMethod()".',
+        ], $deprecations);
+    }
+
+    public function testVirtualUseWithMagicCall()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists('Test\\'.ExtendsVirtualMagicCall::class, true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([], $deprecations);
+    }
+
+    public function testEvaluatedCode()
+    {
+        $this->assertTrue(class_exists(Fixtures\DefinitionInEvaluatedCode::class, true));
     }
 }
 
@@ -278,39 +371,78 @@ class ClassLoader
 
     public function getClassMap()
     {
-        return array(__NAMESPACE__.'\Fixtures\NotPSR0bis' => __DIR__.'/Fixtures/notPsr0Bis.php');
+        return [__NAMESPACE__.'\Fixtures\NotPSR0bis' => __DIR__.'/Fixtures/notPsr0Bis.php'];
     }
 
     public function findFile($class)
     {
-        $fixtureDir = __DIR__.DIRECTORY_SEPARATOR.'Fixtures'.DIRECTORY_SEPARATOR;
+        $fixtureDir = __DIR__.\DIRECTORY_SEPARATOR.'Fixtures'.\DIRECTORY_SEPARATOR;
 
-        if (__NAMESPACE__.'\TestingUnsilencing' === $class) {
+        if (TestingUnsilencing::class === $class) {
             eval('-- parse error --');
-        } elseif (__NAMESPACE__.'\TestingStacking' === $class) {
+        } elseif (TestingStacking::class === $class) {
             eval('namespace '.__NAMESPACE__.'; class TestingStacking { function foo() {} }');
-        } elseif (__NAMESPACE__.'\TestingCaseMismatch' === $class) {
+        } elseif (TestingCaseMismatch::class === $class) {
             eval('namespace '.__NAMESPACE__.'; class TestingCaseMisMatch {}');
-        } elseif (__NAMESPACE__.'\Fixtures\CaseMismatch' === $class) {
-            return $fixtureDir.'CaseMismatch.php';
         } elseif (__NAMESPACE__.'\Fixtures\Psr4CaseMismatch' === $class) {
-            return $fixtureDir.'psr4'.DIRECTORY_SEPARATOR.'Psr4CaseMismatch.php';
+            return $fixtureDir.'psr4'.\DIRECTORY_SEPARATOR.'Psr4CaseMismatch.php';
         } elseif (__NAMESPACE__.'\Fixtures\NotPSR0' === $class) {
             return $fixtureDir.'reallyNotPsr0.php';
         } elseif (__NAMESPACE__.'\Fixtures\NotPSR0bis' === $class) {
             return $fixtureDir.'notPsr0Bis.php';
-        } elseif (__NAMESPACE__.'\Fixtures\DeprecatedInterface' === $class) {
-            return $fixtureDir.'DeprecatedInterface.php';
         } elseif ('Symfony\Bridge\Debug\Tests\Fixtures\ExtendsDeprecatedParent' === $class) {
             eval('namespace Symfony\Bridge\Debug\Tests\Fixtures; class ExtendsDeprecatedParent extends \\'.__NAMESPACE__.'\Fixtures\DeprecatedClass {}');
-        } elseif ('Test\\'.__NAMESPACE__.'\DeprecatedParentClass' === $class) {
+        } elseif ('Test\\'.DeprecatedParentClass::class === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class DeprecatedParentClass extends \\'.__NAMESPACE__.'\Fixtures\DeprecatedClass {}');
-        } elseif ('Test\\'.__NAMESPACE__.'\DeprecatedInterfaceClass' === $class) {
+        } elseif ('Test\\'.DeprecatedInterfaceClass::class === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class DeprecatedInterfaceClass implements \\'.__NAMESPACE__.'\Fixtures\DeprecatedInterface {}');
-        } elseif ('Test\\'.__NAMESPACE__.'\NonDeprecatedInterfaceClass' === $class) {
+        } elseif ('Test\\'.NonDeprecatedInterfaceClass::class === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class NonDeprecatedInterfaceClass implements \\'.__NAMESPACE__.'\Fixtures\NonDeprecatedInterface {}');
-        } elseif ('Test\\'.__NAMESPACE__.'\Float' === $class) {
+        } elseif ('Test\\'.Float::class === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class Float {}');
+        } elseif (0 === strpos($class, 'Test\\'.ExtendsFinalClass::class)) {
+            $classShortName = substr($class, strrpos($class, '\\') + 1);
+            eval('namespace Test\\'.__NAMESPACE__.'; class '.$classShortName.' extends \\'.__NAMESPACE__.'\Fixtures\\'.substr($classShortName, 7).' {}');
+        } elseif ('Test\\'.ExtendsAnnotatedClass::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsAnnotatedClass extends \\'.__NAMESPACE__.'\Fixtures\AnnotatedClass {
+                public function deprecatedMethod() { }
+            }');
+        } elseif ('Test\\'.ExtendsInternals::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsInternals extends ExtendsInternalsParent {
+                use \\'.__NAMESPACE__.'\Fixtures\InternalTrait;
+
+                public function internalMethod() { }
+            }');
+        } elseif ('Test\\'.ExtendsInternalsParent::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsInternalsParent extends \\'.__NAMESPACE__.'\Fixtures\InternalClass implements \\'.__NAMESPACE__.'\Fixtures\InternalInterface { }');
+        } elseif ('Test\\'.UseTraitWithInternalMethod::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class UseTraitWithInternalMethod { use \\'.__NAMESPACE__.'\Fixtures\TraitWithInternalMethod; }');
+        } elseif ('Test\\'.ExtendsVirtual::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsVirtual extends ExtendsVirtualParent implements \\'.__NAMESPACE__.'\Fixtures\VirtualSubInterface {
+                public function ownClassMethod() { }
+                public function classMethod() { }
+                public function sameLineInterfaceMethodNoBraces() { }
+            }');
+        } elseif ('Test\\'.ExtendsVirtualParent::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsVirtualParent extends ExtendsVirtualAbstract {
+                public function ownParentMethod() { }
+                public function traitMethod() { }
+                public function sameLineInterfaceMethod() { }
+                public function staticMethodNoBraces() { } // should be static
+            }');
+        } elseif ('Test\\'.ExtendsVirtualAbstract::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; abstract class ExtendsVirtualAbstract extends ExtendsVirtualAbstractBase {
+                public static function staticMethod() { }
+                public function ownAbstractMethod() { }
+                public function interfaceMethod() { }
+            }');
+        } elseif ('Test\\'.ExtendsVirtualAbstractBase::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; abstract class ExtendsVirtualAbstractBase extends \\'.__NAMESPACE__.'\Fixtures\VirtualClass implements \\'.__NAMESPACE__.'\Fixtures\VirtualInterface {
+                public function ownAbstractBaseMethod() { }
+            }');
+        } elseif ('Test\\'.ExtendsVirtualMagicCall::class === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsVirtualMagicCall extends \\'.__NAMESPACE__.'\Fixtures\VirtualClassMagicCall implements \\'.__NAMESPACE__.'\Fixtures\VirtualInterface {
+            }');
         }
     }
 }

Tests/ErrorHandlerTest.php

@@ -12,17 +12,23 @@
 namespace Symfony\Component\Debug\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
 use Psr\Log\LogLevel;
+use Psr\Log\NullLogger;
 use Symfony\Component\Debug\BufferingLogger;
 use Symfony\Component\Debug\ErrorHandler;
-use Symfony\Component\Debug\Exception\ContextErrorException;
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
+use Symfony\Component\Debug\Tests\Fixtures\ErrorHandlerThatUsesThePreviousOne;
+use Symfony\Component\Debug\Tests\Fixtures\LoggerThatSetAnErrorHandler;
 
 /**
  * ErrorHandlerTest.
  *
  * @author Robert Schönthal <seroscho@googlemail.com>
  * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @group legacy
  */
 class ErrorHandlerTest extends TestCase
 {
@@ -31,21 +37,21 @@ class ErrorHandlerTest extends TestCase
         $handler = ErrorHandler::register();
 
         try {
-            $this->assertInstanceOf('Symfony\Component\Debug\ErrorHandler', $handler);
+            $this->assertInstanceOf(ErrorHandler::class, $handler);
             $this->assertSame($handler, ErrorHandler::register());
 
             $newHandler = new ErrorHandler();
 
-            $this->assertSame($newHandler, ErrorHandler::register($newHandler, false));
+            $this->assertSame($handler, ErrorHandler::register($newHandler, false));
             $h = set_error_handler('var_dump');
             restore_error_handler();
-            $this->assertSame(array($handler, 'handleError'), $h);
+            $this->assertSame([$handler, 'handleError'], $h);
 
             try {
                 $this->assertSame($newHandler, ErrorHandler::register($newHandler, true));
                 $h = set_error_handler('var_dump');
                 restore_error_handler();
-                $this->assertSame(array($newHandler, 'handleError'), $h);
+                $this->assertSame([$newHandler, 'handleError'], $h);
             } catch (\Exception $e) {
             }
 
@@ -66,19 +72,47 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
+    public function testErrorGetLast()
+    {
+        $logger = $this->createMock(LoggerInterface::class);
+        $handler = ErrorHandler::register();
+        $handler->setDefaultLogger($logger);
+        $handler->screamAt(\E_ALL);
+
+        try {
+            @trigger_error('Hello', \E_USER_WARNING);
+            $expected = [
+                'type' => \E_USER_WARNING,
+                'message' => 'Hello',
+                'file' => __FILE__,
+                'line' => __LINE__ - 5,
+            ];
+            $this->assertSame($expected, error_get_last());
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
+    }
+
     public function testNotice()
     {
         ErrorHandler::register();
 
         try {
             self::triggerNotice($this);
-            $this->fail('ContextErrorException expected');
-        } catch (ContextErrorException $exception) {
+            $this->fail('ErrorException expected');
+        } catch (\ErrorException $exception) {
             // if an exception is thrown, the test passed
-            $this->assertEquals(E_NOTICE, $exception->getSeverity());
+            if (\PHP_VERSION_ID < 80000) {
+                $this->assertEquals(\E_NOTICE, $exception->getSeverity());
+                $this->assertMatchesRegularExpression('/^Notice: Undefined variable: (foo|bar)/', $exception->getMessage());
+            } else {
+                $this->assertEquals(\E_WARNING, $exception->getSeverity());
+                $this->assertMatchesRegularExpression('/^Warning: Undefined variable \$(foo|bar)/', $exception->getMessage());
+            }
             $this->assertEquals(__FILE__, $exception->getFile());
-            $this->assertRegExp('/^Notice: Undefined variable: (foo|bar)/', $exception->getMessage());
-            $this->assertArrayHasKey('foobar', $exception->getContext());
 
             $trace = $exception->getTrace();
 
@@ -100,8 +134,6 @@ class ErrorHandlerTest extends TestCase
     // dummy function to test trace in error handler.
     private static function triggerNotice($that)
     {
-        // dummy variable to check for in error handler.
-        $foobar = 123;
         $that->assertSame('', $foo.$foo.$bar);
     }
 
@@ -110,7 +142,7 @@ class ErrorHandlerTest extends TestCase
         try {
             $handler = ErrorHandler::register();
             $handler->throwAt(3, true);
-            $this->assertEquals(3 | E_RECOVERABLE_ERROR | E_USER_ERROR, $handler->throwAt(0));
+            $this->assertEquals(3 | \E_RECOVERABLE_ERROR | \E_USER_ERROR, $handler->throwAt(0));
         } finally {
             restore_error_handler();
             restore_exception_handler();
@@ -120,31 +152,30 @@ class ErrorHandlerTest extends TestCase
     public function testDefaultLogger()
     {
         try {
+            $logger = $this->createMock(LoggerInterface::class);
             $handler = ErrorHandler::register();
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+            $handler->setDefaultLogger($logger, \E_NOTICE);
+            $handler->setDefaultLogger($logger, [\E_USER_NOTICE => LogLevel::CRITICAL]);
 
-            $handler->setDefaultLogger($logger, E_NOTICE);
-            $handler->setDefaultLogger($logger, array(E_USER_NOTICE => LogLevel::CRITICAL));
-
-            $loggers = array(
-                E_DEPRECATED => array(null, LogLevel::INFO),
-                E_USER_DEPRECATED => array(null, LogLevel::INFO),
-                E_NOTICE => array($logger, LogLevel::WARNING),
-                E_USER_NOTICE => array($logger, LogLevel::CRITICAL),
-                E_STRICT => array(null, LogLevel::WARNING),
-                E_WARNING => array(null, LogLevel::WARNING),
-                E_USER_WARNING => array(null, LogLevel::WARNING),
-                E_COMPILE_WARNING => array(null, LogLevel::WARNING),
-                E_CORE_WARNING => array(null, LogLevel::WARNING),
-                E_USER_ERROR => array(null, LogLevel::CRITICAL),
-                E_RECOVERABLE_ERROR => array(null, LogLevel::CRITICAL),
-                E_COMPILE_ERROR => array(null, LogLevel::CRITICAL),
-                E_PARSE => array(null, LogLevel::CRITICAL),
-                E_ERROR => array(null, LogLevel::CRITICAL),
-                E_CORE_ERROR => array(null, LogLevel::CRITICAL),
-            );
-            $this->assertSame($loggers, $handler->setLoggers(array()));
+            $loggers = [
+                \E_DEPRECATED => [null, LogLevel::INFO],
+                \E_USER_DEPRECATED => [null, LogLevel::INFO],
+                \E_NOTICE => [$logger, LogLevel::WARNING],
+                \E_USER_NOTICE => [$logger, LogLevel::CRITICAL],
+                \E_STRICT => [null, LogLevel::WARNING],
+                \E_WARNING => [null, LogLevel::WARNING],
+                \E_USER_WARNING => [null, LogLevel::WARNING],
+                \E_COMPILE_WARNING => [null, LogLevel::WARNING],
+                \E_CORE_WARNING => [null, LogLevel::WARNING],
+                \E_USER_ERROR => [null, LogLevel::CRITICAL],
+                \E_RECOVERABLE_ERROR => [null, LogLevel::CRITICAL],
+                \E_COMPILE_ERROR => [null, LogLevel::CRITICAL],
+                \E_PARSE => [null, LogLevel::CRITICAL],
+                \E_ERROR => [null, LogLevel::CRITICAL],
+                \E_CORE_ERROR => [null, LogLevel::CRITICAL],
+            ];
+            $this->assertSame($loggers, $handler->setLoggers([]));
         } finally {
             restore_error_handler();
             restore_exception_handler();
@@ -156,14 +187,14 @@ class ErrorHandlerTest extends TestCase
         try {
             $handler = ErrorHandler::register();
             $handler->throwAt(0, true);
-            $this->assertFalse($handler->handleError(0, 'foo', 'foo.php', 12, array()));
+            $this->assertFalse($handler->handleError(0, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
 
             $handler = ErrorHandler::register();
             $handler->throwAt(3, true);
-            $this->assertFalse($handler->handleError(4, 'foo', 'foo.php', 12, array()));
+            $this->assertFalse($handler->handleError(4, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
@@ -171,7 +202,7 @@ class ErrorHandlerTest extends TestCase
             $handler = ErrorHandler::register();
             $handler->throwAt(3, true);
             try {
-                $handler->handleError(4, 'foo', 'foo.php', 12, array());
+                $handler->handleError(4, 'foo', 'foo.php', 12, []);
             } catch (\ErrorException $e) {
                 $this->assertSame('Parse Error: foo', $e->getMessage());
                 $this->assertSame(4, $e->getSeverity());
@@ -183,20 +214,20 @@ class ErrorHandlerTest extends TestCase
             restore_exception_handler();
 
             $handler = ErrorHandler::register();
-            $handler->throwAt(E_USER_DEPRECATED, true);
-            $this->assertFalse($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));
+            $handler->throwAt(\E_USER_DEPRECATED, true);
+            $this->assertFalse($handler->handleError(\E_USER_DEPRECATED, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
 
             $handler = ErrorHandler::register();
-            $handler->throwAt(E_DEPRECATED, true);
-            $this->assertFalse($handler->handleError(E_DEPRECATED, 'foo', 'foo.php', 12, array()));
+            $handler->throwAt(\E_DEPRECATED, true);
+            $this->assertFalse($handler->handleError(\E_DEPRECATED, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+            $logger = $this->createMock(LoggerInterface::class);
 
             $warnArgCheck = function ($logLevel, $message, $context) {
                 $this->assertEquals('info', $logLevel);
@@ -205,42 +236,59 @@ class ErrorHandlerTest extends TestCase
                 $exception = $context['exception'];
                 $this->assertInstanceOf(\ErrorException::class, $exception);
                 $this->assertSame('User Deprecated: foo', $exception->getMessage());
-                $this->assertSame(E_USER_DEPRECATED, $exception->getSeverity());
+                $this->assertSame(\E_USER_DEPRECATED, $exception->getSeverity());
             };
 
             $logger
                 ->expects($this->once())
                 ->method('log')
-                ->will($this->returnCallback($warnArgCheck))
+                ->willReturnCallback($warnArgCheck)
             ;
 
             $handler = ErrorHandler::register();
-            $handler->setDefaultLogger($logger, E_USER_DEPRECATED);
-            $this->assertTrue($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));
+            $handler->setDefaultLogger($logger, \E_USER_DEPRECATED);
+            $this->assertTrue($handler->handleError(\E_USER_DEPRECATED, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+            $logger = $this->createMock(LoggerInterface::class);
 
-            $logArgCheck = function ($level, $message, $context) {
-                $this->assertEquals('Notice: Undefined variable: undefVar', $message);
+            $line = null;
+            $logArgCheck = function ($level, $message, $context) use (&$line) {
                 $this->assertArrayHasKey('exception', $context);
                 $exception = $context['exception'];
+
+                if (\PHP_VERSION_ID < 80000) {
+                    $this->assertEquals('Notice: Undefined variable: undefVar', $message);
+                    $this->assertSame(\E_NOTICE, $exception->getSeverity());
+                } else {
+                    $this->assertEquals('Warning: Undefined variable $undefVar', $message);
+                    $this->assertSame(\E_WARNING, $exception->getSeverity());
+                }
                 $this->assertInstanceOf(SilencedErrorContext::class, $exception);
-                $this->assertSame(E_NOTICE, $exception->getSeverity());
+                $this->assertSame(__FILE__, $exception->getFile());
+                $this->assertSame($line, $exception->getLine());
+                $this->assertNotEmpty($exception->getTrace());
+                $this->assertSame(1, $exception->count);
             };
 
             $logger
                 ->expects($this->once())
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
             $handler = ErrorHandler::register();
-            $handler->setDefaultLogger($logger, E_NOTICE);
-            $handler->screamAt(E_NOTICE);
+            if (\PHP_VERSION_ID < 80000) {
+                $handler->setDefaultLogger($logger, \E_NOTICE);
+                $handler->screamAt(\E_NOTICE);
+            } else {
+                $handler->setDefaultLogger($logger, \E_WARNING);
+                $handler->screamAt(\E_WARNING);
+            }
             unset($undefVar);
+            $line = __LINE__ + 1;
             @$undefVar++;
 
             restore_error_handler();
@@ -255,6 +303,10 @@ class ErrorHandlerTest extends TestCase
 
     public function testHandleUserError()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            $this->markTestSkipped('PHP 7.4 allows __toString to throw exceptions');
+        }
+
         try {
             $handler = ErrorHandler::register();
             $handler->throwAt(0, true);
@@ -275,6 +327,26 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
+    public function testHandleErrorWithAnonymousClass()
+    {
+        $handler = ErrorHandler::register();
+        $handler->throwAt(\E_USER_WARNING, true);
+        try {
+            $handler->handleError(\E_USER_WARNING, 'foo '.\get_class(new class() extends \stdClass {
+            }).' bar', 'foo.php', 12);
+            $this->fail('Exception expected.');
+        } catch (\ErrorException $e) {
+        } finally {
+            restore_error_handler();
+            restore_exception_handler();
+        }
+
+        $this->assertSame('User Warning: foo stdClass@anonymous bar', $e->getMessage());
+        $this->assertSame(\E_USER_WARNING, $e->getSeverity());
+        $this->assertSame('foo.php', $e->getFile());
+        $this->assertSame(12, $e->getLine());
+    }
+
     public function testHandleDeprecation()
     {
         $logArgCheck = function ($level, $message, $context) {
@@ -285,27 +357,26 @@ class ErrorHandlerTest extends TestCase
             $this->assertSame('User Deprecated: Foo deprecation', $exception->getMessage());
         };
 
-        $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+        $logger = $this->createMock(LoggerInterface::class);
         $logger
             ->expects($this->once())
             ->method('log')
-            ->will($this->returnCallback($logArgCheck))
+            ->willReturnCallback($logArgCheck)
         ;
 
         $handler = new ErrorHandler();
         $handler->setDefaultLogger($logger);
-        @$handler->handleError(E_USER_DEPRECATED, 'Foo deprecation', __FILE__, __LINE__, array());
+        @$handler->handleError(\E_USER_DEPRECATED, 'Foo deprecation', __FILE__, __LINE__, []);
     }
 
     public function testHandleException()
     {
         try {
+            $logger = $this->createMock(LoggerInterface::class);
             $handler = ErrorHandler::register();
 
             $exception = new \Exception('foo');
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-
             $logArgCheck = function ($level, $message, $context) {
                 $this->assertSame('Uncaught Exception: foo', $message);
                 $this->assertArrayHasKey('exception', $context);
@@ -315,10 +386,10 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($this->exactly(2))
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
-            $handler->setDefaultLogger($logger, E_ERROR);
+            $handler->setDefaultLogger($logger, \E_ERROR);
 
             try {
                 $handler->handleException($exception);
@@ -338,61 +409,32 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
-    public function testErrorStacking()
-    {
-        try {
-            $handler = ErrorHandler::register();
-            $handler->screamAt(E_USER_WARNING);
-
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-
-            $logger
-                ->expects($this->exactly(2))
-                ->method('log')
-                ->withConsecutive(
-                    array($this->equalTo(LogLevel::WARNING), $this->equalTo('Dummy log')),
-                    array($this->equalTo(LogLevel::DEBUG), $this->equalTo('User Warning: Silenced warning'))
-                )
-            ;
-
-            $handler->setDefaultLogger($logger, array(E_USER_WARNING => LogLevel::WARNING));
-
-            ErrorHandler::stackErrors();
-            @trigger_error('Silenced warning', E_USER_WARNING);
-            $logger->log(LogLevel::WARNING, 'Dummy log');
-            ErrorHandler::unstackErrors();
-        } finally {
-            restore_error_handler();
-            restore_exception_handler();
-        }
-    }
-
     public function testBootstrappingLogger()
     {
         $bootLogger = new BufferingLogger();
         $handler = new ErrorHandler($bootLogger);
 
-        $loggers = array(
-            E_DEPRECATED => array($bootLogger, LogLevel::INFO),
-            E_USER_DEPRECATED => array($bootLogger, LogLevel::INFO),
-            E_NOTICE => array($bootLogger, LogLevel::WARNING),
-            E_USER_NOTICE => array($bootLogger, LogLevel::WARNING),
-            E_STRICT => array($bootLogger, LogLevel::WARNING),
-            E_WARNING => array($bootLogger, LogLevel::WARNING),
-            E_USER_WARNING => array($bootLogger, LogLevel::WARNING),
-            E_COMPILE_WARNING => array($bootLogger, LogLevel::WARNING),
-            E_CORE_WARNING => array($bootLogger, LogLevel::WARNING),
-            E_USER_ERROR => array($bootLogger, LogLevel::CRITICAL),
-            E_RECOVERABLE_ERROR => array($bootLogger, LogLevel::CRITICAL),
-            E_COMPILE_ERROR => array($bootLogger, LogLevel::CRITICAL),
-            E_PARSE => array($bootLogger, LogLevel::CRITICAL),
-            E_ERROR => array($bootLogger, LogLevel::CRITICAL),
-            E_CORE_ERROR => array($bootLogger, LogLevel::CRITICAL),
-        );
+        $loggers = [
+            \E_DEPRECATED => [$bootLogger, LogLevel::INFO],
+            \E_USER_DEPRECATED => [$bootLogger, LogLevel::INFO],
+            \E_NOTICE => [$bootLogger, LogLevel::WARNING],
+            \E_USER_NOTICE => [$bootLogger, LogLevel::WARNING],
+            \E_STRICT => [$bootLogger, LogLevel::WARNING],
+            \E_WARNING => [$bootLogger, LogLevel::WARNING],
+            \E_USER_WARNING => [$bootLogger, LogLevel::WARNING],
+            \E_COMPILE_WARNING => [$bootLogger, LogLevel::WARNING],
+            \E_CORE_WARNING => [$bootLogger, LogLevel::WARNING],
+            \E_USER_ERROR => [$bootLogger, LogLevel::CRITICAL],
+            \E_RECOVERABLE_ERROR => [$bootLogger, LogLevel::CRITICAL],
+            \E_COMPILE_ERROR => [$bootLogger, LogLevel::CRITICAL],
+            \E_PARSE => [$bootLogger, LogLevel::CRITICAL],
+            \E_ERROR => [$bootLogger, LogLevel::CRITICAL],
+            \E_CORE_ERROR => [$bootLogger, LogLevel::CRITICAL],
+        ];
 
-        $this->assertSame($loggers, $handler->setLoggers(array()));
+        $this->assertSame($loggers, $handler->setLoggers([]));
 
-        $handler->handleError(E_DEPRECATED, 'Foo message', __FILE__, 123, array());
+        $handler->handleError(\E_DEPRECATED, 'Foo message', __FILE__, 123, []);
 
         $logs = $bootLogger->cleanLogs();
 
@@ -406,16 +448,16 @@ class ErrorHandlerTest extends TestCase
         $this->assertSame('Deprecated: Foo message', $exception->getMessage());
         $this->assertSame(__FILE__, $exception->getFile());
         $this->assertSame(123, $exception->getLine());
-        $this->assertSame(E_DEPRECATED, $exception->getSeverity());
+        $this->assertSame(\E_DEPRECATED, $exception->getSeverity());
 
-        $bootLogger->log(LogLevel::WARNING, 'Foo message', array('exception' => $exception));
+        $bootLogger->log(LogLevel::WARNING, 'Foo message', ['exception' => $exception]);
 
-        $mockLogger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+        $mockLogger = $this->createMock(LoggerInterface::class);
         $mockLogger->expects($this->once())
             ->method('log')
-            ->with(LogLevel::WARNING, 'Foo message', array('exception' => $exception));
+            ->with(LogLevel::WARNING, 'Foo message', ['exception' => $exception]);
 
-        $handler->setLoggers(array(E_DEPRECATED => array($mockLogger, LogLevel::WARNING)));
+        $handler->setLoggers([\E_DEPRECATED => [$mockLogger, LogLevel::WARNING]]);
     }
 
     public function testSettingLoggerWhenExceptionIsBuffered()
@@ -425,10 +467,10 @@ class ErrorHandlerTest extends TestCase
 
         $exception = new \Exception('Foo message');
 
-        $mockLogger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+        $mockLogger = $this->createMock(LoggerInterface::class);
         $mockLogger->expects($this->once())
             ->method('log')
-            ->with(LogLevel::CRITICAL, 'Uncaught Exception: Foo message', array('exception' => $exception));
+            ->with(LogLevel::CRITICAL, 'Uncaught Exception: Foo message', ['exception' => $exception]);
 
         $handler->setExceptionHandler(function () use ($handler, $mockLogger) {
             $handler->setDefaultLogger($mockLogger);
@@ -440,16 +482,15 @@ class ErrorHandlerTest extends TestCase
     public function testHandleFatalError()
     {
         try {
+            $logger = $this->createMock(LoggerInterface::class);
             $handler = ErrorHandler::register();
 
-            $error = array(
-                'type' => E_PARSE,
+            $error = [
+                'type' => \E_PARSE,
                 'message' => 'foo',
                 'file' => 'bar',
                 'line' => 123,
-            );
-
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+            ];
 
             $logArgCheck = function ($level, $message, $context) {
                 $this->assertEquals('Fatal Parse Error: foo', $message);
@@ -460,10 +501,10 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($this->once())
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
-            $handler->setDefaultLogger($logger, E_PARSE);
+            $handler->setDefaultLogger($logger, \E_PARSE);
 
             $handler->handleFatalError($error);
 
@@ -477,55 +518,83 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
-    /**
-     * @requires PHP 7
-     */
     public function testHandleErrorException()
     {
-        $exception = new \Error("Class 'Foo' not found");
+        $exception = new \Error("Class 'IReallyReallyDoNotExistAnywhereInTheRepositoryISwear' not found");
 
         $handler = new ErrorHandler();
         $handler->setExceptionHandler(function () use (&$args) {
-            $args = func_get_args();
+            $args = \func_get_args();
         });
 
         $handler->handleException($exception);
 
-        $this->assertInstanceOf('Symfony\Component\Debug\Exception\ClassNotFoundException', $args[0]);
-        $this->assertStringStartsWith("Attempted to load class \"Foo\" from the global namespace.\nDid you forget a \"use\" statement", $args[0]->getMessage());
+        $this->assertInstanceOf(ClassNotFoundException::class, $args[0]);
+        $this->assertStringStartsWith("Attempted to load class \"IReallyReallyDoNotExistAnywhereInTheRepositoryISwear\" from the global namespace.\nDid you forget a \"use\" statement", $args[0]->getMessage());
     }
 
-    public function testHandleFatalErrorOnHHVM()
+    public function testCustomExceptionHandler()
+    {
+        $this->expectException(\Exception::class);
+        $handler = new ErrorHandler();
+        $handler->setExceptionHandler(function ($e) use ($handler) {
+            $handler->handleException($e);
+        });
+
+        $handler->handleException(new \Exception());
+    }
+
+    /**
+     * @dataProvider errorHandlerWhenLoggingProvider
+     */
+    public function testErrorHandlerWhenLogging($previousHandlerWasDefined, $loggerSetsAnotherHandler, $nextHandlerIsDefined)
     {
         try {
+            if ($previousHandlerWasDefined) {
+                set_error_handler('count');
+            }
+
+            $logger = $loggerSetsAnotherHandler ? new LoggerThatSetAnErrorHandler() : new NullLogger();
+
             $handler = ErrorHandler::register();
+            $handler->setDefaultLogger($logger);
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-            $logger
-                ->expects($this->once())
-                ->method('log')
-                ->with(
-                    $this->equalTo(LogLevel::CRITICAL),
-                    $this->equalTo('Fatal Error: foo')
-                )
-            ;
+            if ($nextHandlerIsDefined) {
+                $handler = ErrorHandlerThatUsesThePreviousOne::register();
+            }
 
-            $handler->setDefaultLogger($logger, E_ERROR);
+            @trigger_error('foo', \E_USER_DEPRECATED);
+            @trigger_error('bar', \E_USER_DEPRECATED);
 
-            $error = array(
-                'type' => E_ERROR + 0x1000000, // This error level is used by HHVM for fatal errors
-                'message' => 'foo',
-                'file' => 'bar',
-                'line' => 123,
-                'context' => array(123),
-                'backtrace' => array(456),
-            );
+            $this->assertSame([$handler, 'handleError'], set_error_handler('var_dump'));
 
-            call_user_func_array(array($handler, 'handleError'), $error);
-            $handler->handleFatalError($error);
+            if ($logger instanceof LoggerThatSetAnErrorHandler) {
+                $this->assertCount(2, $logger->cleanLogs());
+            }
+
+            restore_error_handler();
+
+            if ($previousHandlerWasDefined) {
+                restore_error_handler();
+            }
+
+            if ($nextHandlerIsDefined) {
+                restore_error_handler();
+            }
         } finally {
             restore_error_handler();
             restore_exception_handler();
         }
     }
+
+    public function errorHandlerWhenLoggingProvider()
+    {
+        foreach ([false, true] as $previousHandlerWasDefined) {
+            foreach ([false, true] as $loggerSetsAnotherHandler) {
+                foreach ([false, true] as $nextHandlerIsDefined) {
+                    yield [$previousHandlerWasDefined, $loggerSetsAnotherHandler, $nextHandlerIsDefined];
+                }
+            }
+        }
+    }
 }

Tests/Exception/FlattenExceptionTest.php

@@ -12,22 +12,27 @@
 namespace Symfony\Component\Debug\Tests\Exception;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\Debug\Exception\FlattenException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
-use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
-use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
-use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
-use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
-use Symfony\Component\HttpKernel\Exception\ConflictHttpException;
+use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+use Symfony\Component\HttpKernel\Exception\ConflictHttpException;
 use Symfony\Component\HttpKernel\Exception\GoneHttpException;
 use Symfony\Component\HttpKernel\Exception\LengthRequiredHttpException;
+use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\Exception\PreconditionFailedHttpException;
 use Symfony\Component\HttpKernel\Exception\PreconditionRequiredHttpException;
 use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
 use Symfony\Component\HttpKernel\Exception\TooManyRequestsHttpException;
+use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
 use Symfony\Component\HttpKernel\Exception\UnsupportedMediaTypeHttpException;
 
+/**
+ * @group legacy
+ */
 class FlattenExceptionTest extends TestCase
 {
     public function testStatusCode()
@@ -38,6 +43,12 @@ class FlattenExceptionTest extends TestCase
         $flattened = FlattenException::create(new \RuntimeException());
         $this->assertEquals('500', $flattened->getStatusCode());
 
+        $flattened = FlattenException::createFromThrowable(new \DivisionByZeroError(), 403);
+        $this->assertEquals('403', $flattened->getStatusCode());
+
+        $flattened = FlattenException::createFromThrowable(new \DivisionByZeroError());
+        $this->assertEquals('500', $flattened->getStatusCode());
+
         $flattened = FlattenException::create(new NotFoundHttpException());
         $this->assertEquals('404', $flattened->getStatusCode());
 
@@ -53,7 +64,7 @@ class FlattenExceptionTest extends TestCase
         $flattened = FlattenException::create(new ConflictHttpException());
         $this->assertEquals('409', $flattened->getStatusCode());
 
-        $flattened = FlattenException::create(new MethodNotAllowedHttpException(array('POST')));
+        $flattened = FlattenException::create(new MethodNotAllowedHttpException(['POST']));
         $this->assertEquals('405', $flattened->getStatusCode());
 
         $flattened = FlattenException::create(new AccessDeniedHttpException());
@@ -79,36 +90,41 @@ class FlattenExceptionTest extends TestCase
 
         $flattened = FlattenException::create(new UnsupportedMediaTypeHttpException());
         $this->assertEquals('415', $flattened->getStatusCode());
+
+        if (class_exists(SuspiciousOperationException::class)) {
+            $flattened = FlattenException::create(new SuspiciousOperationException());
+            $this->assertEquals('400', $flattened->getStatusCode());
+        }
     }
 
     public function testHeadersForHttpException()
     {
-        $flattened = FlattenException::create(new MethodNotAllowedHttpException(array('POST')));
-        $this->assertEquals(array('Allow' => 'POST'), $flattened->getHeaders());
+        $flattened = FlattenException::create(new MethodNotAllowedHttpException(['POST']));
+        $this->assertEquals(['Allow' => 'POST'], $flattened->getHeaders());
 
         $flattened = FlattenException::create(new UnauthorizedHttpException('Basic realm="My Realm"'));
-        $this->assertEquals(array('WWW-Authenticate' => 'Basic realm="My Realm"'), $flattened->getHeaders());
+        $this->assertEquals(['WWW-Authenticate' => 'Basic realm="My Realm"'], $flattened->getHeaders());
 
         $flattened = FlattenException::create(new ServiceUnavailableHttpException('Fri, 31 Dec 1999 23:59:59 GMT'));
-        $this->assertEquals(array('Retry-After' => 'Fri, 31 Dec 1999 23:59:59 GMT'), $flattened->getHeaders());
+        $this->assertEquals(['Retry-After' => 'Fri, 31 Dec 1999 23:59:59 GMT'], $flattened->getHeaders());
 
         $flattened = FlattenException::create(new ServiceUnavailableHttpException(120));
-        $this->assertEquals(array('Retry-After' => 120), $flattened->getHeaders());
+        $this->assertEquals(['Retry-After' => 120], $flattened->getHeaders());
 
         $flattened = FlattenException::create(new TooManyRequestsHttpException('Fri, 31 Dec 1999 23:59:59 GMT'));
-        $this->assertEquals(array('Retry-After' => 'Fri, 31 Dec 1999 23:59:59 GMT'), $flattened->getHeaders());
+        $this->assertEquals(['Retry-After' => 'Fri, 31 Dec 1999 23:59:59 GMT'], $flattened->getHeaders());
 
         $flattened = FlattenException::create(new TooManyRequestsHttpException(120));
-        $this->assertEquals(array('Retry-After' => 120), $flattened->getHeaders());
+        $this->assertEquals(['Retry-After' => 120], $flattened->getHeaders());
     }
 
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testFlattenHttpException(\Exception $exception, $statusCode)
+    public function testFlattenHttpException(\Throwable $exception)
     {
-        $flattened = FlattenException::create($exception);
-        $flattened2 = FlattenException::create($exception);
+        $flattened = FlattenException::createFromThrowable($exception);
+        $flattened2 = FlattenException::createFromThrowable($exception);
 
         $flattened->setPrevious($flattened2);
 
@@ -117,96 +133,131 @@ class FlattenExceptionTest extends TestCase
         $this->assertInstanceOf($flattened->getClass(), $exception, 'The class is set to the class of the original exception');
     }
 
+    public function testWrappedThrowable()
+    {
+        $exception = new FatalThrowableError(new \DivisionByZeroError('Ouch', 42));
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame('Ouch', $flattened->getMessage(), 'The message is copied from the original error.');
+        $this->assertSame(42, $flattened->getCode(), 'The code is copied from the original error.');
+        $this->assertSame('DivisionByZeroError', $flattened->getClass(), 'The class is set to the class of the original error');
+    }
+
+    public function testThrowable()
+    {
+        $error = new \DivisionByZeroError('Ouch', 42);
+        $flattened = FlattenException::createFromThrowable($error);
+
+        $this->assertSame('Ouch', $flattened->getMessage(), 'The message is copied from the original error.');
+        $this->assertSame(42, $flattened->getCode(), 'The code is copied from the original error.');
+        $this->assertSame('DivisionByZeroError', $flattened->getClass(), 'The class is set to the class of the original error');
+    }
+
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testPrevious(\Exception $exception, $statusCode)
+    public function testPrevious(\Throwable $exception)
     {
-        $flattened = FlattenException::create($exception);
-        $flattened2 = FlattenException::create($exception);
+        $flattened = FlattenException::createFromThrowable($exception);
+        $flattened2 = FlattenException::createFromThrowable($exception);
 
         $flattened->setPrevious($flattened2);
 
         $this->assertSame($flattened2, $flattened->getPrevious());
 
-        $this->assertSame(array($flattened2), $flattened->getAllPrevious());
+        $this->assertSame([$flattened2], $flattened->getAllPrevious());
     }
 
-    /**
-     * @requires PHP 7.0
-     */
     public function testPreviousError()
     {
         $exception = new \Exception('test', 123, new \ParseError('Oh noes!', 42));
 
         $flattened = FlattenException::create($exception)->getPrevious();
 
-        $this->assertEquals($flattened->getMessage(), 'Parse error: Oh noes!', 'The message is copied from the original exception.');
-        $this->assertEquals($flattened->getCode(), 42, 'The code is copied from the original exception.');
-        $this->assertEquals($flattened->getClass(), 'Symfony\Component\Debug\Exception\FatalThrowableError', 'The class is set to the class of the original exception');
+        $this->assertEquals('Oh noes!', $flattened->getMessage(), 'The message is copied from the original exception.');
+        $this->assertEquals(42, $flattened->getCode(), 'The code is copied from the original exception.');
+        $this->assertEquals('ParseError', $flattened->getClass(), 'The class is set to the class of the original exception');
     }
 
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testLine(\Exception $exception)
+    public function testLine(\Throwable $exception)
     {
-        $flattened = FlattenException::create($exception);
+        $flattened = FlattenException::createFromThrowable($exception);
         $this->assertSame($exception->getLine(), $flattened->getLine());
     }
 
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testFile(\Exception $exception)
+    public function testFile(\Throwable $exception)
     {
-        $flattened = FlattenException::create($exception);
+        $flattened = FlattenException::createFromThrowable($exception);
         $this->assertSame($exception->getFile(), $flattened->getFile());
     }
 
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testToArray(\Exception $exception, $statusCode)
+    public function testToArray(\Throwable $exception, string $expectedClass)
     {
-        $flattened = FlattenException::create($exception);
-        $flattened->setTrace(array(), 'foo.php', 123);
+        $flattened = FlattenException::createFromThrowable($exception);
+        $flattened->setTrace([], 'foo.php', 123);
 
-        $this->assertEquals(array(
-            array(
+        $this->assertEquals([
+            [
                 'message' => 'test',
-                'class' => 'Exception',
-                'trace' => array(array(
+                'class' => $expectedClass,
+                'trace' => [[
                     'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => '', 'file' => 'foo.php', 'line' => 123,
-                    'args' => array(),
-                )),
-            ),
-        ), $flattened->toArray());
+                    'args' => [],
+                ]],
+            ],
+        ], $flattened->toArray());
+    }
+
+    public function testCreate()
+    {
+        $exception = new NotFoundHttpException(
+            'test',
+            new \RuntimeException('previous', 123)
+        );
+
+        $this->assertSame(
+            FlattenException::createFromThrowable($exception)->toArray(),
+            FlattenException::create($exception)->toArray()
+        );
     }
 
     public function flattenDataProvider()
     {
-        return array(
-            array(new \Exception('test', 123), 500),
-        );
+        return [
+            [new \Exception('test', 123), 'Exception'],
+            [new \Error('test', 123), 'Error'],
+        ];
     }
 
     public function testArguments()
     {
+        if (\PHP_VERSION_ID >= 70400) {
+            $this->markTestSkipped('PHP 7.4 removes arguments from exception traces.');
+        }
+
         $dh = opendir(__DIR__);
         $fh = tmpfile();
 
         $incomplete = unserialize('O:14:"BogusTestClass":0:{}');
 
-        $exception = $this->createException(array(
-            (object) array('foo' => 1),
+        $exception = $this->createException([
+            (object) ['foo' => 1],
             new NotFoundHttpException(),
             $incomplete,
             $dh,
             $fh,
             function () {},
-            array(1, 2),
-            array('foo' => 123),
+            [1, 2],
+            ['foo' => 123],
             null,
             true,
             false,
@@ -214,9 +265,9 @@ class FlattenExceptionTest extends TestCase
             0.0,
             '0',
             '',
-            INF,
-            NAN,
-        ));
+            \INF,
+            \NAN,
+        ]);
 
         $flattened = FlattenException::create($exception);
         $trace = $flattened->getTrace();
@@ -227,45 +278,54 @@ class FlattenExceptionTest extends TestCase
         fclose($fh);
 
         $i = 0;
-        $this->assertSame(array('object', 'stdClass'), $array[$i++]);
-        $this->assertSame(array('object', 'Symfony\Component\HttpKernel\Exception\NotFoundHttpException'), $array[$i++]);
-        $this->assertSame(array('incomplete-object', 'BogusTestClass'), $array[$i++]);
-        $this->assertSame(array('resource', defined('HHVM_VERSION') ? 'Directory' : 'stream'), $array[$i++]);
-        $this->assertSame(array('resource', 'stream'), $array[$i++]);
+        $this->assertSame(['object', 'stdClass'], $array[$i++]);
+        $this->assertSame(['object', 'Symfony\Component\HttpKernel\Exception\NotFoundHttpException'], $array[$i++]);
+        $this->assertSame(['incomplete-object', 'BogusTestClass'], $array[$i++]);
+        $this->assertSame(['resource', 'stream'], $array[$i++]);
+        $this->assertSame(['resource', 'stream'], $array[$i++]);
 
         $args = $array[$i++];
         $this->assertSame($args[0], 'object');
-        $this->assertTrue('Closure' === $args[1] || is_subclass_of($args[1], '\Closure'), 'Expect object class name to be Closure or a subclass of Closure.');
+        $this->assertTrue('Closure' === $args[1] || is_subclass_of($args[1], \Closure::class), 'Expect object class name to be Closure or a subclass of Closure.');
 
-        $this->assertSame(array('array', array(array('integer', 1), array('integer', 2))), $array[$i++]);
-        $this->assertSame(array('array', array('foo' => array('integer', 123))), $array[$i++]);
-        $this->assertSame(array('null', null), $array[$i++]);
-        $this->assertSame(array('boolean', true), $array[$i++]);
-        $this->assertSame(array('boolean', false), $array[$i++]);
-        $this->assertSame(array('integer', 0), $array[$i++]);
-        $this->assertSame(array('float', 0.0), $array[$i++]);
-        $this->assertSame(array('string', '0'), $array[$i++]);
-        $this->assertSame(array('string', ''), $array[$i++]);
-        $this->assertSame(array('float', INF), $array[$i++]);
+        $this->assertSame(['array', [['integer', 1], ['integer', 2]]], $array[$i++]);
+        $this->assertSame(['array', ['foo' => ['integer', 123]]], $array[$i++]);
+        $this->assertSame(['null', null], $array[$i++]);
+        $this->assertSame(['boolean', true], $array[$i++]);
+        $this->assertSame(['boolean', false], $array[$i++]);
+        $this->assertSame(['integer', 0], $array[$i++]);
+        $this->assertSame(['float', 0.0], $array[$i++]);
+        $this->assertSame(['string', '0'], $array[$i++]);
+        $this->assertSame(['string', ''], $array[$i++]);
+        $this->assertSame(['float', \INF], $array[$i++]);
 
         // assertEquals() does not like NAN values.
-        $this->assertEquals($array[$i][0], 'float');
-        $this->assertTrue(is_nan($array[$i++][1]));
+        $this->assertEquals('float', $array[$i][0]);
+        $this->assertNan($array[$i][1]);
     }
 
     public function testRecursionInArguments()
     {
-        $a = array('foo', array(2, &$a));
+        if (\PHP_VERSION_ID >= 70400) {
+            $this->markTestSkipped('PHP 7.4 removes arguments from exception traces.');
+        }
+
+        $a = null;
+        $a = ['foo', [2, &$a]];
         $exception = $this->createException($a);
 
         $flattened = FlattenException::create($exception);
         $trace = $flattened->getTrace();
-        $this->assertContains('*DEEP NESTED ARRAY*', serialize($trace));
+        $this->assertStringContainsString('*DEEP NESTED ARRAY*', serialize($trace));
     }
 
     public function testTooBigArray()
     {
-        $a = array();
+        if (\PHP_VERSION_ID >= 70400) {
+            $this->markTestSkipped('PHP 7.4 removes arguments from exception traces.');
+        }
+
+        $a = [];
         for ($i = 0; $i < 20; ++$i) {
             for ($j = 0; $j < 50; ++$j) {
                 for ($k = 0; $k < 10; ++$k) {
@@ -280,12 +340,65 @@ class FlattenExceptionTest extends TestCase
         $flattened = FlattenException::create($exception);
         $trace = $flattened->getTrace();
 
-        $this->assertSame($trace[1]['args'][0], array('array', array('array', '*SKIPPED over 10000 entries*')));
+        $this->assertSame($trace[1]['args'][0], ['array', ['array', '*SKIPPED over 10000 entries*']]);
 
         $serializeTrace = serialize($trace);
 
-        $this->assertContains('*SKIPPED over 10000 entries*', $serializeTrace);
-        $this->assertNotContains('*value1*', $serializeTrace);
+        $this->assertStringContainsString('*SKIPPED over 10000 entries*', $serializeTrace);
+        $this->assertStringNotContainsString('*value1*', $serializeTrace);
+    }
+
+    public function testAnonymousClass()
+    {
+        $flattened = FlattenException::create(new class() extends \RuntimeException {
+        });
+
+        $this->assertSame('RuntimeException@anonymous', $flattened->getClass());
+
+        $flattened->setClass(\get_class(new class('Oops') extends NotFoundHttpException {
+        }));
+
+        $this->assertSame('Symfony\Component\HttpKernel\Exception\NotFoundHttpException@anonymous', $flattened->getClass());
+
+        $flattened = FlattenException::create(new \Exception(sprintf('Class "%s" blah.', \get_class(new class() extends \RuntimeException {
+        }))));
+
+        $this->assertSame('Class "RuntimeException@anonymous" blah.', $flattened->getMessage());
+    }
+
+    public function testToStringEmptyMessage()
+    {
+        $exception = new \RuntimeException();
+
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame($exception->getTraceAsString(), $flattened->getTraceAsString());
+        $this->assertSame($exception->__toString(), $flattened->getAsString());
+    }
+
+    public function testToString()
+    {
+        $test = function ($a, $b, $c, $d) {
+            return new \RuntimeException('This is a test message');
+        };
+
+        $exception = $test('foo123', 1, null, 1.5);
+
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame($exception->getTraceAsString(), $flattened->getTraceAsString());
+        $this->assertSame($exception->__toString(), $flattened->getAsString());
+    }
+
+    public function testToStringParent()
+    {
+        $exception = new \LogicException('This is message 1');
+        $exception = new \RuntimeException('This is messsage 2', 500, $exception);
+
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame($exception->getTraceAsString(), $flattened->getTraceAsString());
+        $this->assertSame($exception->__toString(), $flattened->getAsString());
     }
 
     private function createException($foo)

Tests/ExceptionHandlerTest.php

@@ -12,25 +12,31 @@
 namespace Symfony\Component\Debug\Tests;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\Debug\ExceptionHandler;
 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
 require_once __DIR__.'/HeaderMock.php';
 
+/**
+ * @group legacy
+ */
 class ExceptionHandlerTest extends TestCase
 {
-    protected function setUp()
+    protected function setUp(): void
     {
         testHeader();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         testHeader();
     }
 
+    /**
+     * @group legacy
+     */
     public function testDebug()
     {
         $handler = new ExceptionHandler(false);
@@ -39,8 +45,8 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new \RuntimeException('Foo'));
         $response = ob_get_clean();
 
-        $this->assertContains('<h1>Whoops, looks like something went wrong.</h1>', $response);
-        $this->assertNotContains('<h2 class="block_exception clear_fix">', $response);
+        $this->assertStringContainsString('Whoops, looks like something went wrong.', $response);
+        $this->assertStringNotContainsString('<div class="trace trace-as-html">', $response);
 
         $handler = new ExceptionHandler(true);
 
@@ -48,8 +54,17 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new \RuntimeException('Foo'));
         $response = ob_get_clean();
 
-        $this->assertContains('<h1>Whoops, looks like something went wrong.</h1>', $response);
-        $this->assertContains('<h2 class="block_exception clear_fix">', $response);
+        $this->assertStringContainsString('<h1 class="break-long-words exception-message">Foo</h1>', $response);
+        $this->assertStringContainsString('<div class="trace trace-as-html">', $response);
+
+        // taken from https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)
+        $htmlWithXss = '<body onload=alert(\'test1\')> <b onmouseover=alert(\'Wufff!\')>click me!</b> <img src="j&#X41vascript:alert(\'test2\')"> <meta http-equiv="refresh"
+content="0;url=data:text/html;base64,PHNjcmlwdD5hbGVydCgndGVzdDMnKTwvc2NyaXB0Pg">';
+        ob_start();
+        $handler->sendPhpResponse(new \RuntimeException($htmlWithXss));
+        $response = ob_get_clean();
+
+        $this->assertStringContainsString(sprintf('<h1 class="break-long-words exception-message">%s</h1>', htmlspecialchars($htmlWithXss, \ENT_COMPAT | \ENT_SUBSTITUTE, 'UTF-8')), $response);
     }
 
     public function testStatusCode()
@@ -60,12 +75,12 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new NotFoundHttpException('Foo'));
         $response = ob_get_clean();
 
-        $this->assertContains('Sorry, the page you are looking for could not be found.', $response);
+        $this->assertStringContainsString('Sorry, the page you are looking for could not be found.', $response);
 
-        $expectedHeaders = array(
-            array('HTTP/1.0 404', true, null),
-            array('Content-Type: text/html; charset=iso8859-1', true, null),
-        );
+        $expectedHeaders = [
+            ['HTTP/1.0 404', true, null],
+            ['Content-Type: text/html; charset=iso8859-1', true, null],
+        ];
 
         $this->assertSame($expectedHeaders, testHeader());
     }
@@ -75,14 +90,14 @@ class ExceptionHandlerTest extends TestCase
         $handler = new ExceptionHandler(false, 'iso8859-1');
 
         ob_start();
-        $handler->sendPhpResponse(new MethodNotAllowedHttpException(array('POST')));
-        $response = ob_get_clean();
+        $handler->sendPhpResponse(new MethodNotAllowedHttpException(['POST']));
+        ob_get_clean();
 
-        $expectedHeaders = array(
-            array('HTTP/1.0 405', true, null),
-            array('Allow: POST', false, null),
-            array('Content-Type: text/html; charset=iso8859-1', true, null),
-        );
+        $expectedHeaders = [
+            ['HTTP/1.0 405', true, null],
+            ['Allow: POST', false, null],
+            ['Content-Type: text/html; charset=iso8859-1', true, null],
+        ];
 
         $this->assertSame($expectedHeaders, testHeader());
     }
@@ -94,40 +109,70 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new \RuntimeException('Foo', 0, new \RuntimeException('Bar')));
         $response = ob_get_clean();
 
-        $this->assertStringMatchesFormat('%A<span class="exception_message">Foo</span>%A<span class="exception_message">Bar</span>%A', $response);
+        $this->assertStringMatchesFormat('%A<p class="break-long-words trace-message">Foo</p>%A<p class="break-long-words trace-message">Bar</p>%A', $response);
     }
 
     public function testHandle()
     {
-        $exception = new \Exception('foo');
+        $handler = new ExceptionHandler(true);
+        ob_start();
 
-        $handler = $this->getMockBuilder('Symfony\Component\Debug\ExceptionHandler')->setMethods(array('sendPhpResponse'))->getMock();
-        $handler
-            ->expects($this->exactly(2))
-            ->method('sendPhpResponse');
+        $handler->handle(new \Exception('foo'));
 
-        $handler->handle($exception);
+        $this->assertThatTheExceptionWasOutput(ob_get_clean(), \Exception::class, 'Exception', 'foo');
+    }
 
-        $handler->setHandler(function ($e) use ($exception) {
-            $this->assertSame($exception, $e);
+    public function testHandleWithACustomHandlerThatOutputsSomething()
+    {
+        $handler = new ExceptionHandler(true);
+        ob_start();
+        $handler->setHandler(function () {
+            echo 'ccc';
         });
 
-        $handler->handle($exception);
+        $handler->handle(new \Exception());
+        ob_end_flush(); // Necessary because of this PHP bug : https://bugs.php.net/76563
+        $this->assertSame('ccc', ob_get_clean());
+    }
+
+    public function testHandleWithACustomHandlerThatOutputsNothing()
+    {
+        $handler = new ExceptionHandler(true);
+        $handler->setHandler(function () {});
+
+        $handler->handle(new \Exception('ccc'));
+
+        $this->assertThatTheExceptionWasOutput(ob_get_clean(), \Exception::class, 'Exception', 'ccc');
+    }
+
+    public function testHandleWithACustomHandlerThatFails()
+    {
+        $handler = new ExceptionHandler(true);
+        $handler->setHandler(function () {
+            throw new \RuntimeException();
+        });
+
+        $handler->handle(new \Exception('ccc'));
+
+        $this->assertThatTheExceptionWasOutput(ob_get_clean(), \Exception::class, 'Exception', 'ccc');
     }
 
     public function testHandleOutOfMemoryException()
     {
-        $exception = new OutOfMemoryException('foo', 0, E_ERROR, __FILE__, __LINE__);
-
-        $handler = $this->getMockBuilder('Symfony\Component\Debug\ExceptionHandler')->setMethods(array('sendPhpResponse'))->getMock();
-        $handler
-            ->expects($this->once())
-            ->method('sendPhpResponse');
-
-        $handler->setHandler(function ($e) {
+        $handler = new ExceptionHandler(true);
+        ob_start();
+        $handler->setHandler(function () {
             $this->fail('OutOfMemoryException should bypass the handler');
         });
 
-        $handler->handle($exception);
+        $handler->handle(new OutOfMemoryException('foo', 0, \E_ERROR, __FILE__, __LINE__));
+
+        $this->assertThatTheExceptionWasOutput(ob_get_clean(), OutOfMemoryException::class, 'OutOfMemoryException', 'foo');
+    }
+
+    private function assertThatTheExceptionWasOutput($content, $expectedClass, $expectedTitle, $expectedMessage)
+    {
+        $this->assertStringContainsString(sprintf('<span class="exception_title"><abbr title="%s">%s</abbr></span>', $expectedClass, $expectedTitle), $content);
+        $this->assertStringContainsString(sprintf('<p class="break-long-words trace-message">%s</p>', $expectedMessage), $content);
     }
 }

Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php

@@ -11,29 +11,36 @@
 
 namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
 
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Debug\Exception\FatalErrorException;
-use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
-use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
-use Symfony\Component\Debug\DebugClassLoader;
 use Composer\Autoload\ClassLoader as ComposerClassLoader;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\DebugClassLoader;
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
 
+/**
+ * @group legacy
+ */
 class ClassNotFoundFatalErrorHandlerTest extends TestCase
 {
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         foreach (spl_autoload_functions() as $function) {
-            if (!is_array($function)) {
+            if (!\is_array($function)) {
                 continue;
             }
 
             // get class loaders wrapped by DebugClassLoader
             if ($function[0] instanceof DebugClassLoader) {
                 $function = $function[0]->getClassLoader();
+
+                if (!\is_array($function)) {
+                    continue;
+                }
             }
 
             if ($function[0] instanceof ComposerClassLoader) {
-                $function[0]->add('Symfony_Component_Debug_Tests_Fixtures', dirname(dirname(dirname(dirname(dirname(__DIR__))))));
+                $function[0]->add('Symfony_Component_Debug_Tests_Fixtures', \dirname(__DIR__, 5));
                 break;
             }
         }
@@ -61,8 +68,8 @@ class ClassNotFoundFatalErrorHandlerTest extends TestCase
             array_map('spl_autoload_register', $autoloaders);
         }
 
-        $this->assertInstanceOf('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
-        $this->assertSame($translatedMessage, $exception->getMessage());
+        $this->assertInstanceOf(ClassNotFoundException::class, $exception);
+        $this->assertMatchesRegularExpression($translatedMessage, $exception->getMessage());
         $this->assertSame($error['type'], $exception->getSeverity());
         $this->assertSame($error['file'], $exception->getFile());
         $this->assertSame($error['line'], $exception->getLine());
@@ -70,90 +77,128 @@ class ClassNotFoundFatalErrorHandlerTest extends TestCase
 
     public function provideClassNotFoundData()
     {
-        $prefixes = array('Symfony\Component\Debug\Exception\\' => realpath(__DIR__.'/../../Exception'));
+        $autoloader = new ComposerClassLoader();
+        $autoloader->add('Symfony\Component\Debug\Exception\\', realpath(__DIR__.'/../../Exception'));
+        $autoloader->add('Symfony_Component_Debug_Tests_Fixtures', realpath(__DIR__.'/../../Tests/Fixtures'));
 
-        $symfonyAutoloader = new SymfonyClassLoader();
-        $symfonyAutoloader->addPrefixes($prefixes);
+        $debugClassLoader = new DebugClassLoader([$autoloader, 'loadClass']);
 
-        $debugClassLoader = new DebugClassLoader(array($symfonyAutoloader, 'loadClass'));
-
-        return array(
-            array(
-                array(
+        return [
+            [
+                [
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Class "WhizBangFactory" not found',
+                ],
+                "/^Attempted to load class \"WhizBangFactory\" from the global namespace.\nDid you forget a \"use\" statement\?$/",
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'WhizBangFactory\' not found',
-                ),
-                "Attempted to load class \"WhizBangFactory\" from the global namespace.\nDid you forget a \"use\" statement?",
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"WhizBangFactory\" from the global namespace.\nDid you forget a \"use\" statement\?$/",
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\WhizBangFactory\' not found',
-                ),
-                "Attempted to load class \"WhizBangFactory\" from namespace \"Foo\\Bar\".\nDid you forget a \"use\" statement for another namespace?",
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"WhizBangFactory\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for another namespace\?$/",
+            ],
+            [
+                [
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Class "Foo\\Bar\\WhizBangFactory" not found',
+                ],
+                "/^Attempted to load class \"WhizBangFactory\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for another namespace\?$/",
+            ],
+            [
+                [
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Interface "Foo\\Bar\\WhizBangInterface" not found',
+                ],
+                "/^Attempted to load interface \"WhizBangInterface\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for another namespace\?$/",
+            ],
+            [
+                [
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Trait "Foo\\Bar\\WhizBangTrait" not found',
+                ],
+                "/^Attempted to load trait \"WhizBangTrait\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for another namespace\?$/",
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from the global namespace.\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from the global namespace.\nDid you forget a \"use\" statement for .*\"Symfony\\\\Component\\\\Debug\\\\Exception\\\\UndefinedFunctionException\"\?$/",
+                [$debugClassLoader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'PEARClass\' not found',
-                ),
-                "Attempted to load class \"PEARClass\" from the global namespace.\nDid you forget a \"use\" statement for \"Symfony_Component_Debug_Tests_Fixtures_PEARClass\"?",
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"PEARClass\" from the global namespace.\nDid you forget a \"use\" statement for \"Symfony_Component_Debug_Tests_Fixtures_PEARClass\"\?$/",
+                [$debugClassLoader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for .*\"Symfony\\\\Component\\\\Debug\\\\Exception\\\\UndefinedFunctionException\"\?$/",
+                [$debugClassLoader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
-                array($symfonyAutoloader, 'loadClass'),
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for \"Symfony\\\\Component\\\\Debug\\\\Exception\\\\UndefinedFunctionException\"\?$/",
+                [$autoloader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
-                array($debugClassLoader, 'loadClass'),
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for \"Symfony\\\\Component\\\\Debug\\\\Exception\\\\UndefinedFunctionException\"\?/",
+                [$debugClassLoader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\Bar\".\nDid you forget a \"use\" statement for another namespace?",
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for another namespace\?$/",
                 function ($className) { /* do nothing here */ },
-            ),
-        );
+            ],
+        ];
     }
 
     public function testCannotRedeclareClass()
@@ -164,16 +209,16 @@ class ClassNotFoundFatalErrorHandlerTest extends TestCase
 
         require_once __DIR__.'/../FIXTURES2/REQUIREDTWICE.PHP';
 
-        $error = array(
+        $error = [
             'type' => 1,
             'line' => 12,
             'file' => 'foo.php',
             'message' => 'Class \'Foo\\Bar\\RequiredTwice\' not found',
-        );
+        ];
 
         $handler = new ClassNotFoundFatalErrorHandler();
         $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
 
-        $this->assertInstanceOf('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
+        $this->assertInstanceOf(ClassNotFoundException::class, $exception);
     }
 }

Tests/FatalErrorHandler/UndefinedFunctionFatalErrorHandlerTest.php

@@ -13,8 +13,12 @@ namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
 
+/**
+ * @group legacy
+ */
 class UndefinedFunctionFatalErrorHandlerTest extends TestCase
 {
     /**
@@ -25,8 +29,8 @@ class UndefinedFunctionFatalErrorHandlerTest extends TestCase
         $handler = new UndefinedFunctionFatalErrorHandler();
         $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
 
-        $this->assertInstanceOf('Symfony\Component\Debug\Exception\UndefinedFunctionException', $exception);
-        // class names are case insensitive and PHP/HHVM do not return the same
+        $this->assertInstanceOf(UndefinedFunctionException::class, $exception);
+        // class names are case insensitive and PHP do not return the same
         $this->assertSame(strtolower($translatedMessage), strtolower($exception->getMessage()));
         $this->assertSame($error['type'], $exception->getSeverity());
         $this->assertSame($error['file'], $exception->getFile());
@@ -35,44 +39,44 @@ class UndefinedFunctionFatalErrorHandlerTest extends TestCase
 
     public function provideUndefinedFunctionData()
     {
-        return array(
-            array(
-                array(
+        return [
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined function test_namespaced_function()',
-                ),
+                ],
                 "Attempted to call function \"test_namespaced_function\" from the global namespace.\nDid you mean to call \"\\symfony\\component\\debug\\tests\\fatalerrorhandler\\test_namespaced_function\"?",
-            ),
-            array(
-                array(
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined function Foo\\Bar\\Baz\\test_namespaced_function()',
-                ),
+                ],
                 "Attempted to call function \"test_namespaced_function\" from namespace \"Foo\\Bar\\Baz\".\nDid you mean to call \"\\symfony\\component\\debug\\tests\\fatalerrorhandler\\test_namespaced_function\"?",
-            ),
-            array(
-                array(
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined function foo()',
-                ),
+                ],
                 'Attempted to call function "foo" from the global namespace.',
-            ),
-            array(
-                array(
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined function Foo\\Bar\\Baz\\foo()',
-                ),
+                ],
                 'Attempted to call function "foo" from namespace "Foo\Bar\Baz".',
-            ),
-        );
+            ],
+        ];
     }
 }
 

Tests/FatalErrorHandler/UndefinedMethodFatalErrorHandlerTest.php

@@ -13,8 +13,12 @@ namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedMethodException;
 use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
 
+/**
+ * @group legacy
+ */
 class UndefinedMethodFatalErrorHandlerTest extends TestCase
 {
     /**
@@ -25,7 +29,7 @@ class UndefinedMethodFatalErrorHandlerTest extends TestCase
         $handler = new UndefinedMethodFatalErrorHandler();
         $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
 
-        $this->assertInstanceOf('Symfony\Component\Debug\Exception\UndefinedMethodException', $exception);
+        $this->assertInstanceOf(UndefinedMethodException::class, $exception);
         $this->assertSame($translatedMessage, $exception->getMessage());
         $this->assertSame($error['type'], $exception->getSeverity());
         $this->assertSame($error['file'], $exception->getFile());
@@ -34,43 +38,52 @@ class UndefinedMethodFatalErrorHandlerTest extends TestCase
 
     public function provideUndefinedMethodData()
     {
-        return array(
-            array(
-                array(
+        return [
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined method SplObjectStorage::what()',
-                ),
+                ],
                 'Attempted to call an undefined method named "what" of class "SplObjectStorage".',
-            ),
-            array(
-                array(
+            ],
+            [
+                [
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Call to undefined method SplObjectStorage::()',
+                ],
+                'Attempted to call an undefined method named "" of class "SplObjectStorage".',
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined method SplObjectStorage::walid()',
-                ),
+                ],
                 "Attempted to call an undefined method named \"walid\" of class \"SplObjectStorage\".\nDid you mean to call \"valid\"?",
-            ),
-            array(
-                array(
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Call to undefined method SplObjectStorage::offsetFet()',
-                ),
+                ],
                 "Attempted to call an undefined method named \"offsetFet\" of class \"SplObjectStorage\".\nDid you mean to call e.g. \"offsetGet\", \"offsetSet\" or \"offsetUnset\"?",
-            ),
-            array(
-                array(
-                  'type' => 1,
-                  'message' => 'Call to undefined method class@anonymous::test()',
-                  'file' => '/home/possum/work/symfony/test.php',
-                  'line' => 11,
-                ),
+            ],
+            [
+                [
+                    'type' => 1,
+                    'message' => 'Call to undefined method class@anonymous::test()',
+                    'file' => '/home/possum/work/symfony/test.php',
+                    'line' => 11,
+                ],
                 'Attempted to call an undefined method named "test" of class "class@anonymous".',
-            ),
-        );
+            ],
+        ];
     }
 }

Tests/Fixtures/AnnotatedClass.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class AnnotatedClass
+{
+    /**
+     * @deprecated
+     */
+    public function deprecatedMethod()
+    {
+    }
+}

Tests/Fixtures/ClassWithAnnotatedParameters.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class ClassWithAnnotatedParameters
+{
+    /**
+     * @param string $foo this is a foo parameter
+     */
+    public function fooMethod(string $foo)
+    {
+    }
+
+    /**
+     * @param string $bar parameter not implemented yet
+     */
+    public function barMethod(/* string $bar = null */)
+    {
+    }
+
+    /**
+     * @param Quz $quz parameter not implemented yet
+     */
+    public function quzMethod(/* Quz $quz = null */)
+    {
+    }
+
+    /**
+     * @param true $yes
+     */
+    public function isSymfony()
+    {
+    }
+}

Tests/Fixtures/DefinitionInEvaluatedCode.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+eval('
+    namespace Symfony\Component\Debug\Tests\Fixtures;
+
+    class DefinitionInEvaluatedCode
+    {
+    }
+');

Tests/Fixtures/DeprecatedClass.php

@@ -4,7 +4,7 @@ namespace Symfony\Component\Debug\Tests\Fixtures;
 
 /**
  * @deprecated but this is a test
- *             deprecation notice.
+ *             deprecation notice
  * @foobar
  */
 class DeprecatedClass

Tests/Fixtures/DeprecatedInterface.php

@@ -4,7 +4,7 @@ namespace Symfony\Component\Debug\Tests\Fixtures;
 
 /**
  * @deprecated but this is a test
- *             deprecation notice.
+ *             deprecation notice
  * @foobar
  */
 interface DeprecatedInterface

Tests/Fixtures/ErrorHandlerThatUsesThePreviousOne.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class ErrorHandlerThatUsesThePreviousOne
+{
+    private static $previous;
+
+    public static function register()
+    {
+        $handler = new static();
+
+        self::$previous = set_error_handler([$handler, 'handleError']);
+
+        return $handler;
+    }
+
+    public function handleError()
+    {
+        return \call_user_func_array(self::$previous, \func_get_args());
+    }
+}

Tests/Fixtures/ExtendedFinalMethod.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class ExtendedFinalMethod extends FinalMethod
+{
+    use FinalMethod2Trait;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function finalMethod()
+    {
+    }
+
+    public function anotherMethod()
+    {
+    }
+}

Tests/Fixtures/FinalClasses.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @final since version 3.3.
+ */
+class FinalClass1
+{
+    // simple comment
+}
+
+/**
+ * @final
+ */
+class FinalClass2
+{
+    // no comment
+}
+
+/**
+ * @final comment with @@@ and ***
+ *
+ * @author John Doe
+ */
+class FinalClass3
+{
+    // with comment and a tag after
+}
+
+/**
+ * @final
+ *
+ * @author John Doe
+ */
+class FinalClass4
+{
+    // without comment and a tag after
+}
+
+/**
+ * @author John Doe
+ *
+ * @final multiline
+ * comment
+ */
+class FinalClass5
+{
+    // with comment and a tag before
+}
+
+/**
+ * @author John Doe
+ *
+ * @final
+ */
+class FinalClass6
+{
+    // without comment and a tag before
+}
+
+/**
+ * @author John Doe
+ *
+ * @final another
+ *        multiline comment...
+ *
+ * @return string
+ */
+class FinalClass7
+{
+    // with comment and a tag before and after
+}
+
+/**
+ * @author John Doe
+ * @final
+ *
+ * @return string
+ */
+class FinalClass8
+{
+    // without comment and a tag before and after
+}

Tests/Fixtures/FinalMethod.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class FinalMethod
+{
+    /**
+     * @final
+     */
+    public function finalMethod()
+    {
+    }
+
+    /**
+     * @final
+     *
+     * @return int
+     */
+    public function finalMethod2()
+    {
+    }
+
+    public function anotherMethod()
+    {
+    }
+}

Tests/Fixtures/FinalMethod2Trait.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+trait FinalMethod2Trait
+{
+    public function finalMethod2()
+    {
+    }
+}

Tests/Fixtures/InterfaceWithAnnotatedParameters.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * Ensures a deprecation is triggered when a new parameter is not declared in child classes.
+ */
+interface InterfaceWithAnnotatedParameters
+{
+    /**
+     * @param bool $matrix
+     */
+    public function whereAmI();
+
+    /**
+     * @param       $noType
+     * @param callable(\Throwable|null $reason, mixed $value) $callback and a comment
+     * about this great param
+     * @param string                                          $param (comment with $dollar)
+     * @param $defined
+     * @param  callable  ($a,  $b)  $anotherOne
+     * @param callable (mixed $a, $b) $definedCallable
+     * @param Type$WithDollarIsStillAType $ccc
+     * @param \JustAType
+     */
+    public function iAmHere();
+}

Tests/Fixtures/InternalClass.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @internal
+ */
+class InternalClass
+{
+    use InternalTrait2;
+
+    public function usedInInternalClass()
+    {
+    }
+}

Tests/Fixtures/InternalInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @internal
+ */
+interface InternalInterface
+{
+}

Tests/Fixtures/InternalTrait.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @internal
+ */
+trait InternalTrait
+{
+}

Tests/Fixtures/InternalTrait2.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @internal
+ */
+trait InternalTrait2
+{
+    /**
+     * @internal
+     */
+    public function internalMethod()
+    {
+    }
+
+    /**
+     * @internal but should not trigger a deprecation
+     */
+    public function usedInInternalClass()
+    {
+    }
+}

Tests/Fixtures/LoggerThatSetAnErrorHandler.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+use Symfony\Component\Debug\BufferingLogger;
+
+class LoggerThatSetAnErrorHandler extends BufferingLogger
+{
+    public function log($level, $message, array $context = []): void
+    {
+        set_error_handler('is_string');
+        parent::log($level, $message, $context);
+        restore_error_handler();
+    }
+}

Tests/Fixtures/SubClassWithAnnotatedParameters.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class SubClassWithAnnotatedParameters extends ClassWithAnnotatedParameters implements InterfaceWithAnnotatedParameters
+{
+    use TraitWithAnnotatedParameters;
+
+    public function fooMethod(string $foo)
+    {
+    }
+
+    public function barMethod($bar = null)
+    {
+    }
+
+    public function quzMethod()
+    {
+    }
+
+    public function whereAmI()
+    {
+    }
+
+    /**
+     * @param                      $defined
+     * @param Type\Does\Not\Matter $definedCallable
+     */
+    public function iAmHere()
+    {
+    }
+}

Tests/Fixtures/Throwing.php

@@ -0,0 +1,3 @@
+<?php
+
+throw new \Exception('boo');

Tests/Fixtures/ToStringThrower.php

@@ -18,7 +18,7 @@ class ToStringThrower
         } catch (\Exception $e) {
             // Using user_error() here is on purpose so we do not forget
             // that this alias also should work alongside with trigger_error().
-            return user_error($e, E_USER_ERROR);
+            return trigger_error($e, E_USER_ERROR);
         }
     }
 }

Tests/Fixtures/TraitWithAnnotatedParameters.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+trait TraitWithAnnotatedParameters
+{
+    /**
+     * `@param` annotations in traits are not parsed.
+     */
+    public function isSymfony()
+    {
+    }
+}

Tests/Fixtures/TraitWithInternalMethod.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+trait TraitWithInternalMethod
+{
+    /**
+     * @internal
+     */
+    public function foo()
+    {
+    }
+}

Tests/Fixtures/VirtualClass.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @method string classMethod()
+ */
+class VirtualClass
+{
+    use VirtualTrait;
+}

Tests/Fixtures/VirtualClassMagicCall.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @method string magicMethod()
+ * @method static string staticMagicMethod()
+ */
+class VirtualClassMagicCall
+{
+    public static function __callStatic($name, $arguments)
+    {
+    }
+
+    public function __call($name, $arguments)
+    {
+    }
+}

Tests/Fixtures/VirtualInterface.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @method string interfaceMethod()
+ * @method        sameLineInterfaceMethod($arg)
+ * @method sameLineInterfaceMethodNoBraces
+ *
+ * Ignored
+ * @method
+ * @method
+ *
+ * Not ignored
+ * @method newLineInterfaceMethod() Some description!
+ * @method \stdClass newLineInterfaceMethodNoBraces Description
+ *
+ * Invalid
+ * @method unknownType invalidInterfaceMethod()
+ * @method unknownType|string invalidInterfaceMethodNoBraces
+ *
+ * Complex
+ * @method              complexInterfaceMethod($arg, ...$args)
+ * @method string[]|int complexInterfaceMethodTyped($arg, int ...$args) Description ...
+ *
+ * Static
+ * @method static Foo&Bar staticMethod()
+ * @method static staticMethodNoBraces
+ * @method static \stdClass staticMethodTyped(int $arg) Description
+ * @method static \stdClass[] staticMethodTypedNoBraces
+ */
+interface VirtualInterface
+{
+}

Tests/Fixtures/VirtualSubInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @method string subInterfaceMethod()
+ */
+interface VirtualSubInterface extends VirtualInterface
+{
+}

Tests/Fixtures/VirtualTrait.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @method string traitMethod()
+ */
+trait VirtualTrait
+{
+}

Tests/Fixtures2/RequiredTwice.php

@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Symfony\Component\Debug\Tests\Fixtures2;
 
 class RequiredTwice

Tests/HeaderMock.php

@@ -25,14 +25,14 @@ namespace Symfony\Component\Debug\Tests;
 
 function testHeader()
 {
-    static $headers = array();
+    static $headers = [];
 
-    if (!$h = func_get_args()) {
+    if (!$h = \func_get_args()) {
         $h = $headers;
-        $headers = array();
+        $headers = [];
 
         return $h;
     }
 
-    $headers[] = func_get_args();
+    $headers[] = \func_get_args();
 }

Tests/MockExceptionHandler.php

@@ -1,24 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Debug\Tests;
-
-use Symfony\Component\Debug\ExceptionHandler;
-
-class MockExceptionHandler extends ExceptionHandler
-{
-    public $e;
-
-    public function handle(\Exception $e)
-    {
-        $this->e = $e;
-    }
-}

Tests/phpt/debug_class_loader.phpt

@@ -0,0 +1,28 @@
+--TEST--
+Test DebugClassLoader with previously loaded parents
+--FILE--
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+use Symfony\Component\Debug\DebugClassLoader;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+class_exists(FinalMethod::class);
+
+set_error_handler(function ($type, $msg) { echo $msg, "\n"; });
+
+DebugClassLoader::enable();
+
+class_exists(ExtendedFinalMethod::class);
+
+?>
+--EXPECTF--
+%A
+The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".
+The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod2()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".

Tests/phpt/decorate_exception_hander.phpt

@@ -0,0 +1,48 @@
+--TEST--
+Test catching fatal errors when handlers are nested
+--INI--
+display_errors=0
+--FILE--
+<?php
+
+namespace Symfony\Component\Debug;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+set_error_handler('var_dump');
+set_exception_handler('var_dump');
+
+ErrorHandler::register(null, false);
+
+if (true) {
+    class foo extends missing
+    {
+    }
+}
+
+?>
+--EXPECTF--
+%A
+object(Symfony\Component\Debug\Exception\ClassNotFoundException)#%d (8) {
+  ["message":protected]=>
+  string(131) "Attempted to load class "missing" from namespace "Symfony\Component\Debug".
+Did you forget a "use" statement for another namespace?"
+  ["string":"Exception":private]=>
+  string(0) ""
+  ["code":protected]=>
+  int(0)
+  ["file":protected]=>
+  string(%d) "%s"
+  ["line":protected]=>
+  int(%d)
+  ["trace":"Exception":private]=>
+  array(%d) {%A}
+  ["previous":"Exception":private]=>
+  NULL
+  ["severity":protected]=>
+  int(1)
+}

Tests/phpt/exception_rethrown.phpt

@@ -0,0 +1,35 @@
+--TEST--
+Test rethrowing in custom exception handler
+--FILE--
+<?php
+
+namespace Symfony\Component\Debug;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+if (true) {
+    class TestLogger extends \Psr\Log\AbstractLogger
+    {
+        public function log($level, $message, array $context = []): void
+        {
+            echo $message, "\n";
+        }
+    }
+}
+
+set_exception_handler(function ($e) { echo 123; throw $e; });
+ErrorHandler::register()->setDefaultLogger(new TestLogger());
+ini_set('display_errors', 1);
+
+throw new \Exception('foo');
+?>
+--EXPECTF--
+Uncaught Exception: foo
+123
+Fatal error: Uncaught %s:25
+Stack trace:
+%a

Tests/phpt/fatal_with_nested_handlers.phpt

@@ -0,0 +1,43 @@
+--TEST--
+Test catching fatal errors when handlers are nested
+--FILE--
+<?php
+
+namespace Symfony\Component\Debug;
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = \dirname($vendor);
+}
+require $vendor.'/vendor/autoload.php';
+
+Debug::enable();
+ini_set('display_errors', 0);
+
+$eHandler = set_error_handler('var_dump');
+$xHandler = set_exception_handler('var_dump');
+
+var_dump([
+    $eHandler[0] === $xHandler[0] ? 'Error and exception handlers do match' : 'Error and exception handlers are different',
+]);
+
+$eHandler[0]->setExceptionHandler('print_r');
+
+if (true) {
+    class Broken implements \JsonSerializable
+    {
+    }
+}
+
+?>
+--EXPECTF--
+array(1) {
+  [0]=>
+  string(37) "Error and exception handlers do match"
+}
+%A
+object(Symfony\Component\Debug\Exception\FatalErrorException)#%d (%d) {
+  ["message":protected]=>
+  string(179) "Error: Class Symfony\Component\Debug\Broken contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (JsonSerializable::jsonSerialize)"
+%a
+}

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "symfony/debug",
     "type": "library",
-    "description": "Symfony Debug Component",
+    "description": "Provides tools to ease debugging PHP code",
     "keywords": [],
     "homepage": "https://symfony.com",
     "license": "MIT",
@@ -16,15 +16,14 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9",
-        "psr/log": "~1.0"
+        "php": ">=7.1.3",
+        "psr/log": "^1|^2|^3"
     },
     "conflict": {
-        "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
+        "symfony/http-kernel": "<3.4"
     },
     "require-dev": {
-        "symfony/class-loader": "~2.8|~3.0",
-        "symfony/http-kernel": "~2.8|~3.0"
+        "symfony/http-kernel": "^3.4|^4.0|^5.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Debug\\": "" },
@@ -32,10 +31,5 @@
             "/Tests/"
         ]
     },
-    "minimum-stability": "dev",
-    "extra": {
-        "branch-alias": {
-            "dev-master": "3.2-dev"
-        }
-    }
+    "minimum-stability": "dev"
 }

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/5.2/phpunit.xsd"
          backupGlobals="false"
          colors="true"
          bootstrap="vendor/autoload.php"
@@ -14,10 +14,7 @@
 
     <testsuites>
         <testsuite name="Symfony Debug Component Test Suite">
-            <directory>./Tests/</directory>
-        </testsuite>
-        <testsuite name="Symfony Debug Extension Test Suite">
-            <directory suffix=".phpt">./Resources/ext/tests/</directory>
+            <directory suffix=".phpt">./Tests/</directory>
         </testsuite>
     </testsuites>