[Translation][Debug] Add installation and minimal example to README

This PR was squashed before being merged into the 3.4 branch (closes #32800).

Discussion
----------

Improve some URLs

| Q             | A
| ------------- | ---
| Branch?       | 3.4 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | N/A   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | N/A <!-- required for new features -->

<!--
Replace this notice by a short README for your feature/bugfix. This will help people
understand your PR and can be used as a start for the documentation.

Additionally (see https://symfony.com/roadmap):
 - Bug fixes must be submitted against the lowest maintained branch where they apply
   (lowest branches are regularly merged to upper ones so they get the fixes too).
 - Features and deprecations must be submitted against branch 4.4.
 - Legacy code removals go to the master branch.
-->

Commits
-------

fab17a4487 Improve some URLs

BufferingLogger.php

@@ -20,17 +20,17 @@ use Psr\Log\AbstractLogger;
  */
 class BufferingLogger extends AbstractLogger
 {
-    private $logs = array();
+    private $logs = [];
 
-    public function log($level, $message, array $context = array())
+    public function log($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

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+3.4.0
+-----
+
+* deprecated `ErrorHandler::stackErrors()` and `ErrorHandler::unstackErrors()`
+
 3.3.0
 -----
 

Debug.php

@@ -23,10 +23,7 @@ class Debug
     /**
      * Enables the debug tools.
      *
-     * This method registers an error handler and an exception handler.
-     *
-     * If the Symfony ClassLoader component is available, a special
-     * class loader is also registered.
+     * This method registers an error handler, an exception handler and a special class loader.
      *
      * @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)
@@ -45,10 +42,10 @@ class Debug
             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

@@ -26,22 +26,25 @@ class DebugClassLoader
 {
     private $classLoader;
     private $isFinder;
-    private $loaded = array();
+    private $loaded = [];
     private static $caseCheck;
-    private static $final = array();
-    private static $finalMethods = array();
-    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 $php7Reserved = ['int' => 1, 'float' => 1, 'bool' => 1, 'string' => 1, 'true' => 1, 'false' => 1, 'null' => 1];
+    private static $darwinCache = ['/' => ['/', []]];
 
     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);
@@ -50,7 +53,7 @@ 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')) {
@@ -82,7 +85,7 @@ class DebugClassLoader
         class_exists('Symfony\Component\Debug\ErrorHandler');
         class_exists('Psr\Log\LogLevel');
 
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -91,8 +94,8 @@ 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($function);
@@ -104,7 +107,7 @@ class DebugClassLoader
      */
     public static function disable()
     {
-        if (!is_array($functions = spl_autoload_functions())) {
+        if (!\is_array($functions = spl_autoload_functions())) {
             return;
         }
 
@@ -113,7 +116,7 @@ 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();
             }
 
@@ -121,222 +124,332 @@ 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 ($this->isFinder && !isset($this->loaded[$class])) {
                 $this->loaded[$class] = true;
-                if ($file = $this->classLoader[0]->findFile($class)) {
-                    require $file;
+                if (!$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, $class);
+                \call_user_func($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 && '\\' === $class[0]) {
+    private function checkClass($class, $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));
             }
 
-            $parent = get_parent_class($class);
+            $deprecations = $this->checkAnnotations($refl, $name);
 
-            // Not an interface nor a trait
-            if (class_exists($name, false)) {
-                if (preg_match('#\n \* @final(?:( .+?)\.?)?\r?\n \*(?: @|/$)#s', $refl->getDocComment(), $notice)) {
-                    self::$final[$name] = isset($notice[1]) ? preg_replace('#\s*\r?\n \* +#', ' ', $notice[1]) : '';
-                }
-
-                if ($parent && isset(self::$final[$parent])) {
-                    @trigger_error(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], $name), E_USER_DEPRECATED);
-                }
-
-                // Inherit @final annotations
-                self::$finalMethods[$name] = $parent && isset(self::$finalMethods[$parent]) ? self::$finalMethods[$parent] : array();
-
-                foreach ($refl->getMethods(\ReflectionMethod::IS_PUBLIC | \ReflectionMethod::IS_PROTECTED) as $method) {
-                    if ($method->class !== $name) {
-                        continue;
-                    }
-
-                    if ($parent && isset(self::$finalMethods[$parent][$method->name])) {
-                        @trigger_error(sprintf('%s It may change without further notice as of its next major version. You should not extend it from "%s".', self::$finalMethods[$parent][$method->name], $name), E_USER_DEPRECATED);
-                    }
-
-                    $doc = $method->getDocComment();
-                    if (false === $doc || false === strpos($doc, '@final')) {
-                        continue;
-                    }
-
-                    if (preg_match('#\n\s+\* @final(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$)#s', $doc, $notice)) {
-                        $message = isset($notice[1]) ? preg_replace('#\s*\r?\n \* +#', ' ', $notice[1]) : '';
-                        self::$finalMethods[$name][$method->name] = sprintf('The "%s::%s()" method is considered final%s.', $name, $method->name, $message);
-                    }
-                }
+            if (isset(self::$php7Reserved[strtolower($refl->getShortName())])) {
+                $deprecations[] = sprintf('The "%s" class uses the reserved name "%s", it will break on PHP 7 and higher', $name, $refl->getShortName());
             }
 
-            if (in_array(strtolower($refl->getShortName()), self::$php7Reserved)) {
-                @trigger_error(sprintf('The "%s" class uses the reserved name "%s", it 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 {
-                // Don't trigger deprecations for classes in the same vendor
-                if (2 > $len = 1 + (strpos($name, '\\') ?: strpos($name, '_'))) {
-                    $len = 0;
-                    $ns = '';
-                } else {
-                    $ns = substr($name, 0, $len);
-                }
-
-                if (!$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]) : '';
+                }
+            }
+        }
+
+        $parent = get_parent_class($class);
+        $parentAndOwnInterfaces = $this->getOwnInterfaces($class, $parent);
+        if ($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], $class);
+            }
+        }
+
+        if (trait_exists($class)) {
+            return $deprecations;
+        }
+
+        // Inherit @final and @internal annotations for methods
+        self::$finalMethods[$class] = [];
+        self::$internalMethods[$class] = [];
+        foreach ($parentAndOwnInterfaces as $use) {
+            foreach (['finalMethods', 'internalMethods'] 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][$method->name])) {
+                list($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])) {
+                list($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);
+                }
+            }
+
+            // Detect method annotations
+            if (false === $doc = $method->getDocComment()) {
+                continue;
+            }
+
+            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];
+                }
+            }
+        }
+
+        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, -$tailLen + 1)];
+        }
+
+        return null;
+    }
+
+    /**
+     * `realpath` on MacOSX doesn't normalize the case of characters.
+     */
+    private function darwinRealpath($real)
+    {
+        $i = 1 + strrpos($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] = [$dir, []];
+                    self::$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.
+     *
+     * @param string       $class
+     * @param string|false $parent
+     *
+     * @return string[]
+     */
+    private function getOwnInterfaces($class, $parent)
+    {
+        $ownInterfaces = class_implements($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 +11,17 @@
 
 namespace Symfony\Component\Debug;
 
-use Psr\Log\LogLevel;
 use Psr\Log\LoggerInterface;
+use Psr\Log\LogLevel;
 use Symfony\Component\Debug\Exception\ContextErrorException;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\Exception\FatalThrowableError;
 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;
 
 /**
  * A generic ErrorHandler for the PHP engine.
@@ -48,7 +48,7 @@ use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;
  */
 class ErrorHandler
 {
-    private $levels = array(
+    private $levels = [
         E_DEPRECATED => 'Deprecated',
         E_USER_DEPRECATED => 'User Deprecated',
         E_NOTICE => 'Notice',
@@ -64,25 +64,25 @@ class ErrorHandler
         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
@@ -97,10 +97,10 @@ class ErrorHandler
     private $bootstrappingLogger;
 
     private static $reservedMemory;
-    private static $stackedErrors = array();
-    private static $stackedErrorLevels = array();
+    private static $stackedErrors = [];
+    private static $stackedErrorLevels = [];
     private static $toStringException = null;
-    private static $silencedErrorCache = array();
+    private static $silencedErrorCache = [];
     private static $silencedErrorCount = 0;
     private static $exitCode = 0;
 
@@ -123,21 +123,35 @@ 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);
@@ -164,12 +178,12 @@ class ErrorHandler
      */
     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 {
@@ -200,15 +214,15 @@ 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, $log)) {
+            if (!\is_array($log)) {
+                $log = [$log];
+            } elseif (!\array_key_exists(0, $log)) {
                 throw new \InvalidArgumentException('No logger provided');
             }
             if (null === $log[0]) {
@@ -339,14 +353,14 @@ class ErrorHandler
     {
         if ($prev !== $this->thrownErrors | $this->loggedErrors) {
             $handler = set_error_handler('var_dump');
-            $handler = is_array($handler) ? $handler[0] : null;
+            $handler = \is_array($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([$this, 'handleError']);
                 }
             }
         }
@@ -368,23 +382,29 @@ class ErrorHandler
      */
     public function handleError($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();
+        if (4 < $numArgs = \func_num_args()) {
+            $context = $scope ? (func_get_arg(4) ?: []) : [];
             $backtrace = 5 < $numArgs ? func_get_arg(5) : null; // defined on HHVM
         } else {
-            $context = array();
+            $context = [];
             $backtrace = null;
         }
 
@@ -409,23 +429,27 @@ class ErrorHandler
             $errorAsException = self::$toStringException;
             self::$toStringException = null;
         } elseif (!$throw && !($type & $level)) {
-            if (isset(self::$silencedErrorCache[$message])) {
+            if (!isset(self::$silencedErrorCache[$id = $file.':'.$line])) {
+                $lightTrace = $this->tracedErrors & $type ? $this->cleanTrace(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3), $type, $file, $line, false) : [];
+                $errorAsException = new SilencedErrorContext($type, $file, $line, $lightTrace);
+            } elseif (isset(self::$silencedErrorCache[$id][$message])) {
                 $lightTrace = null;
-                $errorAsException = self::$silencedErrorCache[$message];
+                $errorAsException = self::$silencedErrorCache[$id][$message];
                 ++$errorAsException->count;
             } else {
-                $lightTrace = $this->tracedErrors & $type ? $this->cleanTrace(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3), $type, $file, $line, false) : array();
-                $errorAsException = new SilencedErrorContext($type, $file, $line, $lightTrace);
+                $lightTrace = [];
+                $errorAsException = null;
             }
 
             if (100 < ++self::$silencedErrorCount) {
-                self::$silencedErrorCache = $lightTrace = array();
+                self::$silencedErrorCache = $lightTrace = [];
                 self::$silencedErrorCount = 1;
             }
-            self::$silencedErrorCache[$message] = $errorAsException;
-
+            if ($errorAsException) {
+                self::$silencedErrorCache[$id][$message] = $errorAsException;
+            }
             if (null === $lightTrace) {
-                return;
+                return true;
             }
         } else {
             if ($scope) {
@@ -440,12 +464,12 @@ class ErrorHandler
                 $lightTrace = $this->cleanTrace($backtrace, $type, $file, $line, $throw);
                 $this->traceReflector->setValue($errorAsException, $lightTrace);
             } else {
-                $this->traceReflector->setValue($errorAsException, array());
+                $this->traceReflector->setValue($errorAsException, []);
             }
         }
 
         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']
@@ -490,23 +514,32 @@ class ErrorHandler
         if ($this->isRecursive) {
             $log = 0;
         } elseif (self::$stackedErrorLevels) {
-            self::$stackedErrors[] = array(
+            self::$stackedErrors[] = [
                 $this->loggers[$type][0],
                 ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG,
                 $logMessage,
-                array('exception' => $errorAsException),
-            );
+                $errorAsException ? ['exception' => $errorAsException] : [],
+            ];
         } else {
+            if (!\defined('HHVM_VERSION')) {
+                $currentErrorHandler = set_error_handler('var_dump');
+                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 {
                 $this->isRecursive = false;
+
+                if (!\defined('HHVM_VERSION')) {
+                    set_error_handler($currentErrorHandler);
+                }
             }
         }
 
-        return $type && $log;
+        return !$silenced && $type && $log;
     }
 
     /**
@@ -526,16 +559,17 @@ class ErrorHandler
             $exception = new FatalThrowableError($exception);
         }
         $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;
+        $handlerException = null;
 
         if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
             if ($exception instanceof FatalErrorException) {
                 if ($exception instanceof FatalThrowableError) {
-                    $error = array(
+                    $error = [
                         'type' => $type,
                         'message' => $message = $exception->getMessage(),
                         'file' => $exception->getFile(),
                         'line' => $exception->getLine(),
-                    );
+                    ];
                 } else {
                     $message = 'Fatal '.$exception->getMessage();
                 }
@@ -547,7 +581,7 @@ class ErrorHandler
         }
         if ($this->loggedErrors & $type) {
             try {
-                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, array('exception' => $exception));
+                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, ['exception' => $exception]);
             } catch (\Exception $handlerException) {
             } catch (\Throwable $handlerException) {
             }
@@ -560,18 +594,23 @@ class ErrorHandler
                 }
             }
         }
-        if (empty($this->exceptionHandler)) {
-            throw $exception; // Give back $exception to the native handler
-        }
+        $exceptionHandler = $this->exceptionHandler;
+        $this->exceptionHandler = null;
         try {
-            call_user_func($this->exceptionHandler, $exception);
+            if (null !== $exceptionHandler) {
+                $exceptionHandler($exception);
+
+                return;
+            }
+            $handlerException = $handlerException ?: $exception;
         } catch (\Exception $handlerException) {
         } 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);
     }
 
     /**
@@ -587,15 +626,39 @@ 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('var_dump');
+            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) {
             $error = error_get_last();
@@ -648,17 +711,25 @@ class ErrorHandler
      *
      * The most important feature of this is to prevent
      * autoloading until unstackErrors() is called.
+     *
+     * @deprecated since version 3.4, to be removed in 4.0.
      */
     public static function stackErrors()
     {
+        @trigger_error('Support for stacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED);
+
         self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
     }
 
     /**
      * Unstacks stacked errors and forwards to the logger.
+     *
+     * @deprecated since version 3.4, to be removed in 4.0.
      */
     public static function unstackErrors()
     {
+        @trigger_error('Support for unstacking errors is deprecated since Symfony 3.4 and will be removed in 4.0.', E_USER_DEPRECATED);
+
         $level = array_pop(self::$stackedErrorLevels);
 
         if (null !== $level) {
@@ -671,7 +742,7 @@ class ErrorHandler
 
         if (empty(self::$stackedErrorLevels)) {
             $errors = self::$stackedErrors;
-            self::$stackedErrors = array();
+            self::$stackedErrors = [];
 
             foreach ($errors as $error) {
                 $error[0]->log($error[1], $error[2], $error[3]);
@@ -688,11 +759,11 @@ class ErrorHandler
      */
     protected function getFatalErrorHandlers()
     {
-        return array(
+        return [
             new UndefinedFunctionFatalErrorHandler(),
             new UndefinedMethodFatalErrorHandler(),
             new ClassNotFoundFatalErrorHandler(),
-        );
+        ];
     }
 
     private function cleanTrace($backtrace, $type, $file, $line, $throw)
@@ -701,7 +772,7 @@ class ErrorHandler
 
         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);
+                $lightTrace = \array_slice($lightTrace, 1 + $i);
                 break;
             }
         }

Exception/ClassNotFoundException.php

@@ -26,6 +26,9 @@ class ClassNotFoundException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

Exception/ContextErrorException.php

@@ -20,9 +20,9 @@ namespace Symfony\Component\Debug\Exception;
  */
 class ContextErrorException extends \ErrorException
 {
-    private $context = array();
+    private $context = [];
 
-    public function __construct($message, $code, $severity, $filename, $lineno, $context = array())
+    public function __construct($message, $code, $severity, $filename, $lineno, $context = [])
     {
         parent::__construct($message, $code, $severity, $filename, $lineno);
         $this->context = $context;
@@ -33,7 +33,7 @@ class ContextErrorException extends \ErrorException
      */
     public function getContext()
     {
-        @trigger_error(sprintf('The %s class is deprecated since version 3.3 and will be removed in 4.0.', __CLASS__), E_USER_DEPRECATED);
+        @trigger_error(sprintf('The %s class is deprecated since Symfony 3.3 and will be removed in 4.0.', __CLASS__), E_USER_DEPRECATED);
 
         return $this->context;
     }

Exception/FatalErrorException.php

@@ -18,9 +18,9 @@ namespace Symfony\Component\Debug\Exception;
  */
 class FatalErrorException extends \ErrorException
 {
-    public function __construct($message, $code, $severity, $filename, $lineno, $traceOffset = null, $traceArgs = true, array $trace = null)
+    public function __construct($message, $code, $severity, $filename, $lineno, $traceOffset = null, $traceArgs = true, array $trace = null, $previous = null)
     {
-        parent::__construct($message, $code, $severity, $filename, $lineno);
+        parent::__construct($message, $code, $severity, $filename, $lineno, $previous);
 
         if (null !== $trace) {
             if (!$traceArgs) {
@@ -31,7 +31,7 @@ class FatalErrorException extends \ErrorException
 
             $this->setTrace($trace);
         } elseif (null !== $traceOffset) {
-            if (function_exists('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 +60,13 @@ class FatalErrorException extends \ErrorException
 
                 unset($frame);
                 $trace = array_reverse($trace);
-            } elseif (function_exists('symfony_debug_backtrace')) {
+            } 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);

Exception/FatalThrowableError.php

@@ -36,7 +36,8 @@ class FatalThrowableError extends FatalErrorException
             $e->getCode(),
             $severity,
             $e->getFile(),
-            $e->getLine()
+            $e->getLine(),
+            $e->getPrevious()
         );
 
         $this->setTrace($e->getTrace());

Exception/FlattenException.php

@@ -33,7 +33,7 @@ class FlattenException
     private $file;
     private $line;
 
-    public static function create(\Exception $exception, $statusCode = null, array $headers = array())
+    public static function create(\Exception $exception, $statusCode = null, array $headers = [])
     {
         $e = new static();
         $e->setMessage($exception->getMessage());
@@ -53,7 +53,7 @@ class FlattenException
         $e->setStatusCode($statusCode);
         $e->setHeaders($headers);
         $e->setTraceFromException($exception);
-        $e->setClass(get_class($exception));
+        $e->setClass(\get_class($exception));
         $e->setFile($exception->getFile());
         $e->setLine($exception->getLine());
 
@@ -70,13 +70,13 @@ 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;
@@ -157,14 +157,14 @@ class FlattenException
         return $this->previous;
     }
 
-    public function setPrevious(FlattenException $previous)
+    public function setPrevious(self $previous)
     {
         $this->previous = $previous;
     }
 
     public function getAllPrevious()
     {
-        $exceptions = array();
+        $exceptions = [];
         $e = $this;
         while ($e = $e->getPrevious()) {
             $exceptions[] = $e;
@@ -185,8 +185,8 @@ class FlattenException
 
     public function setTrace($trace, $file, $line)
     {
-        $this->trace = array();
-        $this->trace[] = array(
+        $this->trace = [];
+        $this->trace[] = [
             'namespace' => '',
             'short_class' => '',
             'class' => '',
@@ -194,8 +194,8 @@ class FlattenException
             'function' => '',
             'file' => $file,
             'line' => $line,
-            'args' => array(),
-        );
+            'args' => [],
+        ];
         foreach ($trace as $entry) {
             $class = '';
             $namespace = '';
@@ -205,7 +205,7 @@ class FlattenException
                 $namespace = implode('\\', $parts);
             }
 
-            $this->trace[] = array(
+            $this->trace[] = [
                 'namespace' => $namespace,
                 'short_class' => $class,
                 'class' => isset($entry['class']) ? $entry['class'] : '',
@@ -213,41 +213,41 @@ class FlattenException
                 'function' => isset($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(),
-            );
+                'args' => isset($entry['args']) ? $this->flattenArgs($entry['args']) : [],
+            ];
         }
     }
 
     private function flattenArgs($args, $level = 0, &$count = 0)
     {
-        $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];
             }
         }
 

Exception/SilencedErrorContext.php

@@ -25,7 +25,7 @@ class SilencedErrorContext implements \JsonSerializable
     private $line;
     private $trace;
 
-    public function __construct($severity, $file, $line, array $trace = array(), $count = 1)
+    public function __construct($severity, $file, $line, array $trace = [], $count = 1)
     {
         $this->severity = $severity;
         $this->file = $file;
@@ -54,14 +54,14 @@ class SilencedErrorContext implements \JsonSerializable
         return $this->trace;
     }
 
-    public function JsonSerialize()
+    public function jsonSerialize()
     {
-        return array(
+        return [
             'severity' => $this->severity,
             'file' => $this->file,
             'line' => $this->line,
             'trace' => $this->trace,
             'count' => $this->count,
-        );
+        ];
     }
 }

Exception/UndefinedFunctionException.php

@@ -26,6 +26,9 @@ class UndefinedFunctionException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

Exception/UndefinedMethodException.php

@@ -26,6 +26,9 @@ class UndefinedMethodException extends FatalErrorException
             $previous->getSeverity(),
             $previous->getFile(),
             $previous->getLine(),
+            null,
+            true,
+            null,
             $previous->getPrevious()
         );
         $this->setTrace($previous->getTrace());

FatalErrorHandler/ClassNotFoundFatalErrorHandler.php

@@ -11,11 +11,11 @@
 
 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;
 
 /**
  * ErrorHandler for classes that do not exist.
@@ -29,20 +29,20 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     public function handleError(array $error, FatalErrorException $exception)
     {
-        $messageLen = strlen($error['message']);
+        $messageLen = \strlen($error['message']);
         $notFoundSuffix = '\' not found';
-        $notFoundSuffixLen = strlen($notFoundSuffix);
+        $notFoundSuffixLen = \strlen($notFoundSuffix);
         if ($notFoundSuffixLen > $messageLen) {
-            return;
+            return null;
         }
 
         if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
-            return;
+            return null;
         }
 
-        foreach (array('class', 'interface', 'trait') as $typeName) {
+        foreach (['class', 'interface', 'trait'] as $typeName) {
             $prefix = ucfirst($typeName).' \'';
-            $prefixLen = strlen($prefix);
+            $prefixLen = \strlen($prefix);
             if (0 !== strpos($error['message'], $prefix)) {
                 continue;
             }
@@ -71,6 +71,8 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
 
             return new ClassNotFoundException($message, $exception);
         }
+
+        return null;
     }
 
     /**
@@ -85,22 +87,22 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     private function getClassCandidates($class)
     {
-        if (!is_array($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;
                 }
             }
@@ -133,11 +135,11 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     private function findClassInPath($path, $class, $prefix)
     {
-        if (!$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(), $prefix)) {
@@ -157,9 +159,9 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      */
     private function convertFileToClass($path, $file, $prefix)
     {
-        $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 +172,7 @@ 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); });
@@ -185,13 +187,19 @@ 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;
     }
 
     /**

FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php

@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Debug\FatalErrorHandler;
 
-use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedFunctionException;
 
 /**
  * ErrorHandler for undefined functions.
@@ -26,21 +26,21 @@ 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 +53,7 @@ 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

@@ -28,7 +28,7 @@ class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
     {
         preg_match('/^Call to undefined method (.*)::(.*)\(\)$/', $error['message'], $matches);
         if (!$matches) {
-            return;
+            return null;
         }
 
         $className = $matches[1];
@@ -41,10 +41,10 @@ class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
             return new UndefinedMethodException($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) 2004-2020 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

@@ -3,10 +3,22 @@ Debug Component
 
 The Debug component provides tools to ease debugging PHP code.
 
+Getting Started
+---------------
+
+```
+$ composer install 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)

Resources/ext/README.md

@@ -25,41 +25,41 @@ function symfony_zval_info($key, $array, $options = 0)
         return null;
     }
 
-    $info = array(
+    $info = [
         'type' => gettype($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(
+            $info += [
                 'object_class' => get_class($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(
+            $info += [
                 '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(
+            $info += [
                 'array_count' => count($array[$key]),
-            );
+            ];
             break;
 
         case 'string':
-            $info += array(
+            $info += [
                 'strlen' => strlen($array[$key]),
-            );
+            ];
             break;
     }
 

Resources/ext/tests/001.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Test symfony_zval_info API
 --SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
+<?php if (!extension_loaded('symfony_debug')) {
+    echo 'skip';
+} ?>
 --FILE--
 <?php
 
@@ -9,7 +11,7 @@ $int = 42;
 $float = 42.42;
 $str = 'foobar';
 $object = new StdClass();
-$array = array('foo', 'bar');
+$array = ['foo', 'bar'];
 $resource = tmpfile();
 $null = null;
 $bool = true;
@@ -17,7 +19,7 @@ $bool = true;
 $anotherint = 42;
 $refcount2 = &$anotherint;
 
-$var = array(
+$var = [
     'int' => $int,
     'float' => $float,
     'str' => $str,
@@ -27,7 +29,7 @@ $var = array(
     'null' => $null,
     'bool' => $bool,
     'refcount' => &$refcount2,
-);
+];
 
 var_dump(symfony_zval_info('int', $var));
 var_dump(symfony_zval_info('float', $var));

Resources/ext/tests/002.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Test symfony_debug_backtrace in case of fatal error
 --SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
+<?php if (!extension_loaded('symfony_debug')) {
+    echo 'skip';
+} ?>
 --FILE--
 <?php
 

Resources/ext/tests/002_1.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Test symfony_debug_backtrace in case of non fatal error
 --SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
+<?php if (!extension_loaded('symfony_debug')) {
+    echo 'skip';
+} ?>
 --FILE--
 <?php
 

Resources/ext/tests/003.phpt

@@ -1,7 +1,9 @@
 --TEST--
 Test ErrorHandler in case of fatal error
 --SKIPIF--
-<?php if (!extension_loaded('symfony_debug')) print 'skip'; ?>
+<?php if (!extension_loaded('symfony_debug')) {
+    echo 'skip';
+} ?>
 --FILE--
 <?php
 
@@ -43,7 +45,7 @@ function foo()
 $handler = ErrorHandler::register();
 $handler->setExceptionHandler('print_r');
 
-if (function_exists('xdebug_disable')) {
+if (\function_exists('xdebug_disable')) {
     xdebug_disable();
 }
 

Tests/DebugClassLoaderTest.php

@@ -28,14 +28,14 @@ class DebugClassLoaderTest extends TestCase
     {
         $this->errorReporting = error_reporting(E_ALL);
         $this->loader = new ClassLoader();
-        spl_autoload_register(array($this->loader, 'loadClass'), true, true);
+        spl_autoload_register([$this->loader, 'loadClass'], true, true);
         DebugClassLoader::enable();
     }
 
     protected function tearDown()
     {
         DebugClassLoader::disable();
-        spl_autoload_unregister(array($this->loader, 'loadClass'));
+        spl_autoload_unregister([$this->loader, 'loadClass']);
         error_reporting($this->errorReporting);
     }
 
@@ -45,7 +45,7 @@ class DebugClassLoaderTest extends TestCase
 
         $functions = spl_autoload_functions();
         foreach ($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);
@@ -59,21 +59,19 @@ class DebugClassLoaderTest extends TestCase
         $this->fail('DebugClassLoader did not register');
     }
 
-    /**
-     * @expectedException \Exception
-     * @expectedExceptionMessage boo
-     */
     public function testThrowingClass()
     {
+        $this->expectException('Exception');
+        $this->expectExceptionMessage('boo');
         try {
-            class_exists(__NAMESPACE__.'\Fixtures\Throwing');
+            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(__NAMESPACE__.'\Fixtures\Throwing');
+        class_exists(Fixtures\Throwing::class);
     }
 
     public function testUnsilencing()
@@ -81,7 +79,7 @@ class DebugClassLoaderTest extends TestCase
         if (\PHP_VERSION_ID >= 70000) {
             $this->markTestSkipped('PHP7 throws exceptions, unsilencing is not required anymore.');
         }
-        if (defined('HHVM_VERSION')) {
+        if (\defined('HHVM_VERSION')) {
             $this->markTestSkipped('HHVM is not handled in this test case.');
         }
 
@@ -92,7 +90,7 @@ class DebugClassLoaderTest extends TestCase
 
         // See below: this will fail with parse error
         // but this should not be @-silenced.
-        @class_exists(__NAMESPACE__.'\TestingUnsilencing', true);
+        @class_exists(TestingUnsilencing::class, true);
 
         $output = ob_get_clean();
 
@@ -106,7 +104,7 @@ class DebugClassLoaderTest extends TestCase
         if (class_exists('Symfony\Component\Debug\Exception\ContextErrorException', false)) {
             $this->markTestSkipped('The ContextErrorException class is already loaded.');
         }
-        if (defined('HHVM_VERSION')) {
+        if (\defined('HHVM_VERSION')) {
             $this->markTestSkipped('HHVM is not handled in this test case.');
         }
 
@@ -139,34 +137,28 @@ class DebugClassLoaderTest extends TestCase
         }
     }
 
-    /**
-     * @expectedException \RuntimeException
-     * @expectedExceptionMessage Case mismatch between loaded and declared class names
-     */
     public function testNameCaseMismatch()
     {
-        class_exists(__NAMESPACE__.'\TestingCaseMismatch', true);
+        $this->expectException('RuntimeException');
+        $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');
+        $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
-     * @expectedExceptionMessage Case mismatch between loaded and declared class names
-     */
     public function testPsr4CaseMismatch()
     {
+        $this->expectException('RuntimeException');
+        $this->expectExceptionMessage('Case mismatch between loaded and declared class names');
         class_exists(__NAMESPACE__.'\Fixtures\Psr4CaseMismatch', true);
     }
 
@@ -182,7 +174,7 @@ class DebugClassLoaderTest extends TestCase
 
     public function testClassAlias()
     {
-        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\ClassAlias', true));
+        $this->assertTrue(class_exists(Fixtures\ClassAlias::class, true));
     }
 
     /**
@@ -192,7 +184,7 @@ class DebugClassLoaderTest extends TestCase
     {
         set_error_handler(function () { return false; });
         $e = error_reporting(0);
-        trigger_error('', E_USER_DEPRECATED);
+        @trigger_error('', E_USER_DEPRECATED);
 
         class_exists('Test\\'.__NAMESPACE__.'\\'.$class, true);
 
@@ -202,20 +194,20 @@ 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()
@@ -224,7 +216,7 @@ 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();
@@ -232,10 +224,10 @@ 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);
     }
@@ -254,10 +246,10 @@ 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);
     }
@@ -272,7 +264,7 @@ class DebugClassLoaderTest extends TestCase
         $e = error_reporting(0);
         trigger_error('', E_USER_NOTICE);
 
-        class_exists('Test\\'.__NAMESPACE__.'\\Float', true);
+        class_exists('Test\\'.Float::class, true);
 
         error_reporting($e);
         restore_error_handler();
@@ -280,43 +272,69 @@ 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\Float" class uses the reserved name "Float", it will break on PHP 7 and higher',
-        );
+        ];
 
         $this->assertSame($xError, $lastError);
     }
 
     public function testExtendedFinalClass()
     {
-        set_error_handler(function () { return false; });
-        $e = error_reporting(0);
-        trigger_error('', E_USER_NOTICE);
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
 
-        class_exists('Test\\'.__NAMESPACE__.'\\ExtendsFinalClass', true);
+        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();
 
-        $lastError = error_get_last();
-        unset($lastError['file'], $lastError['line']);
-
-        $xError = array(
-            'type' => E_USER_DEPRECATED,
-            'message' => 'The "Symfony\Component\Debug\Tests\Fixtures\FinalClass" 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\ExtendsFinalClass".',
-        );
-
-        $this->assertSame($xError, $lastError);
+        $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 since version 3.3. 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(__NAMESPACE__.'\\Fixtures\\ExtendedFinalMethod', true);
+        class_exists('Test\\'.ExtendsAnnotatedClass::class, true);
 
         error_reporting($e);
         restore_error_handler();
@@ -324,12 +342,45 @@ class DebugClassLoaderTest extends TestCase
         $lastError = error_get_last();
         unset($lastError['file'], $lastError['line']);
 
-        $xError = array(
-            'type' => E_USER_DEPRECATED,
-            'message' => 'The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod()" method 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 "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".',
-        );
+        $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 since version 3.4. 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 since version 3.4. It may change without further notice. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsInternals".',
+        ]);
+    }
+
+    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 testEvaluatedCode()
+    {
+        $this->assertTrue(class_exists(Fixtures\DefinitionInEvaluatedCode::class, true));
     }
 }
 
@@ -341,47 +392,54 @@ 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 (__NAMESPACE__.'\Fixtures\FinalClass' === $class) {
-            return $fixtureDir.'FinalClass.php';
-        } elseif (__NAMESPACE__.'\Fixtures\FinalMethod' === $class) {
-            return $fixtureDir.'FinalMethod.php';
-        } elseif (__NAMESPACE__.'\Fixtures\ExtendedFinalMethod' === $class) {
-            return $fixtureDir.'ExtendedFinalMethod.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 ('Test\\'.__NAMESPACE__.'\ExtendsFinalClass' === $class) {
-            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsFinalClass extends \\'.__NAMESPACE__.'\Fixtures\FinalClass {}');
+        } elseif (0 === strpos($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; }');
         }
+
+        return null;
     }
 }

Tests/ErrorHandlerTest.php

@@ -13,9 +13,12 @@ namespace Symfony\Component\Debug\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LogLevel;
+use Psr\Log\NullLogger;
 use Symfony\Component\Debug\BufferingLogger;
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
+use Symfony\Component\Debug\Tests\Fixtures\ErrorHandlerThatUsesThePreviousOne;
+use Symfony\Component\Debug\Tests\Fixtures\LoggerThatSetAnErrorHandler;
 
 /**
  * ErrorHandlerTest.
@@ -35,16 +38,16 @@ class ErrorHandlerTest extends TestCase
 
             $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) {
             }
 
@@ -65,6 +68,30 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
+    public function testErrorGetLast()
+    {
+        $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
+        $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 $e;
+        }
+    }
+
     public function testNotice()
     {
         ErrorHandler::register();
@@ -98,8 +125,6 @@ class ErrorHandlerTest extends TestCase
     // dummy function to test trace in error handler.
     private static function triggerNotice($that)
     {
-        // dummy variable to check for in error handler.
-        $foobar = 123;
         $that->assertSame('', $foo.$foo.$bar);
     }
 
@@ -118,31 +143,30 @@ class ErrorHandlerTest extends TestCase
     public function testDefaultLogger()
     {
         try {
+            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
             $handler = ErrorHandler::register();
 
-            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
-
             $handler->setDefaultLogger($logger, E_NOTICE);
-            $handler->setDefaultLogger($logger, array(E_USER_NOTICE => LogLevel::CRITICAL));
+            $handler->setDefaultLogger($logger, [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();
@@ -154,14 +178,14 @@ 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();
@@ -169,7 +193,7 @@ 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());
@@ -182,14 +206,14 @@ class ErrorHandlerTest extends TestCase
 
             $handler = ErrorHandler::register();
             $handler->throwAt(E_USER_DEPRECATED, true);
-            $this->assertFalse($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));
+            $this->assertFalse($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()));
+            $this->assertFalse($handler->handleError(E_DEPRECATED, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
@@ -209,12 +233,12 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($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()));
+            $this->assertTrue($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, []));
 
             restore_error_handler();
             restore_exception_handler();
@@ -237,7 +261,7 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($this->once())
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
             $handler = ErrorHandler::register();
@@ -259,6 +283,10 @@ 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);
@@ -293,23 +321,27 @@ class ErrorHandlerTest extends TestCase
         $logger
             ->expects($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__, []);
+
+        restore_error_handler();
     }
 
+    /**
+     * @group no-hhvm
+     */
     public function testHandleException()
     {
         try {
+            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
             $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);
@@ -319,7 +351,7 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($this->exactly(2))
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
             $handler->setDefaultLogger($logger, E_ERROR);
@@ -342,6 +374,9 @@ class ErrorHandlerTest extends TestCase
         }
     }
 
+    /**
+     * @group legacy
+     */
     public function testErrorStacking()
     {
         try {
@@ -354,12 +389,12 @@ class ErrorHandlerTest extends TestCase
                 ->expects($this->exactly(2))
                 ->method('log')
                 ->withConsecutive(
-                    array($this->equalTo(LogLevel::WARNING), $this->equalTo('Dummy log')),
-                    array($this->equalTo(LogLevel::DEBUG), $this->equalTo('User Warning: Silenced warning'))
+                    [$this->equalTo(LogLevel::WARNING), $this->equalTo('Dummy log')],
+                    [$this->equalTo(LogLevel::DEBUG), $this->equalTo('User Warning: Silenced warning')]
                 )
             ;
 
-            $handler->setDefaultLogger($logger, array(E_USER_WARNING => LogLevel::WARNING));
+            $handler->setDefaultLogger($logger, [E_USER_WARNING => LogLevel::WARNING]);
 
             ErrorHandler::stackErrors();
             @trigger_error('Silenced warning', E_USER_WARNING);
@@ -376,27 +411,27 @@ class ErrorHandlerTest extends TestCase
         $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();
 
@@ -412,16 +447,19 @@ class ErrorHandlerTest extends TestCase
         $this->assertSame(123, $exception->getLine());
         $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();
         $mockLogger->expects($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]]);
     }
 
+    /**
+     * @group no-hhvm
+     */
     public function testSettingLoggerWhenExceptionIsBuffered()
     {
         $bootLogger = new BufferingLogger();
@@ -432,7 +470,7 @@ class ErrorHandlerTest extends TestCase
         $mockLogger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
         $mockLogger->expects($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);
@@ -441,19 +479,21 @@ class ErrorHandlerTest extends TestCase
         $handler->handleException($exception);
     }
 
+    /**
+     * @group no-hhvm
+     */
     public function testHandleFatalError()
     {
         try {
+            $logger = $this->getMockBuilder('Psr\Log\LoggerInterface')->getMock();
             $handler = ErrorHandler::register();
 
-            $error = array(
+            $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);
@@ -464,7 +504,7 @@ class ErrorHandlerTest extends TestCase
             $logger
                 ->expects($this->once())
                 ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
             ;
 
             $handler->setDefaultLogger($logger, E_PARSE);
@@ -486,19 +526,22 @@ class ErrorHandlerTest extends TestCase
      */
     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->assertStringStartsWith("Attempted to load class \"IReallyReallyDoNotExistAnywhereInTheRepositoryISwear\" from the global namespace.\nDid you forget a \"use\" statement", $args[0]->getMessage());
     }
 
+    /**
+     * @group no-hhvm
+     */
     public function testHandleFatalErrorOnHHVM()
     {
         try {
@@ -516,20 +559,88 @@ class ErrorHandlerTest extends TestCase
 
             $handler->setDefaultLogger($logger, E_ERROR);
 
-            $error = array(
+            $error = [
                 '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),
-            );
+                'context' => [123],
+                'backtrace' => [456],
+            ];
 
-            call_user_func_array(array($handler, 'handleError'), $error);
+            \call_user_func_array([$handler, 'handleError'], $error);
             $handler->handleFatalError($error);
         } finally {
             restore_error_handler();
             restore_exception_handler();
         }
     }
+
+    /**
+     * @group no-hhvm
+     */
+    public function testCustomExceptionHandler()
+    {
+        $this->expectException('Exception');
+        $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);
+
+            if ($nextHandlerIsDefined) {
+                $handler = ErrorHandlerThatUsesThePreviousOne::register();
+            }
+
+            @trigger_error('foo', E_USER_DEPRECATED);
+            @trigger_error('bar', E_USER_DEPRECATED);
+
+            $this->assertSame([$handler, 'handleError'], set_error_handler('var_dump'));
+
+            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

@@ -14,19 +14,19 @@ namespace Symfony\Component\Debug\Tests\Exception;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
-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\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;
 
 class FlattenExceptionTest extends TestCase
@@ -54,7 +54,7 @@ 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());
@@ -89,29 +89,29 @@ class FlattenExceptionTest extends TestCase
 
     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(\Exception $exception)
     {
         $flattened = FlattenException::create($exception);
         $flattened2 = FlattenException::create($exception);
@@ -126,7 +126,7 @@ class FlattenExceptionTest extends TestCase
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testPrevious(\Exception $exception, $statusCode)
+    public function testPrevious(\Exception $exception)
     {
         $flattened = FlattenException::create($exception);
         $flattened2 = FlattenException::create($exception);
@@ -135,7 +135,7 @@ class FlattenExceptionTest extends TestCase
 
         $this->assertSame($flattened2, $flattened->getPrevious());
 
-        $this->assertSame(array($flattened2), $flattened->getAllPrevious());
+        $this->assertSame([$flattened2], $flattened->getAllPrevious());
     }
 
     /**
@@ -173,46 +173,50 @@ class FlattenExceptionTest extends TestCase
     /**
      * @dataProvider flattenDataProvider
      */
-    public function testToArray(\Exception $exception, $statusCode)
+    public function testToArray(\Exception $exception)
     {
         $flattened = FlattenException::create($exception);
-        $flattened->setTrace(array(), 'foo.php', 123);
+        $flattened->setTrace([], 'foo.php', 123);
 
-        $this->assertEquals(array(
-            array(
+        $this->assertEquals([
+            [
                 'message' => 'test',
                 'class' => 'Exception',
-                'trace' => array(array(
+                'trace' => [[
                     'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => '', 'file' => 'foo.php', 'line' => 123,
-                    'args' => array(),
-                )),
-            ),
-        ), $flattened->toArray());
+                    'args' => [],
+                ]],
+            ],
+        ], $flattened->toArray());
     }
 
     public function flattenDataProvider()
     {
-        return array(
-            array(new \Exception('test', 123), 500),
-        );
+        return [
+            [new \Exception('test', 123)],
+        ];
     }
 
     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,
@@ -222,7 +226,7 @@ class FlattenExceptionTest extends TestCase
             '',
             INF,
             NAN,
-        ));
+        ]);
 
         $flattened = FlattenException::create($exception);
         $trace = $flattened->getTrace();
@@ -233,45 +237,54 @@ class FlattenExceptionTest extends TestCase
         fclose($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', \defined('HHVM_VERSION') ? 'Directory' : '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->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]));
+        $this->assertNan($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) {
@@ -286,12 +299,12 @@ 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);
     }
 
     private function createException($foo)

Tests/ExceptionHandlerTest.php

@@ -12,10 +12,10 @@
 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';
 
@@ -39,8 +39,8 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new \RuntimeException('Foo'));
         $response = ob_get_clean();
 
-        $this->assertContains('Whoops, looks like something went wrong.', $response);
-        $this->assertNotContains('<div class="trace trace-as-html">', $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 +48,8 @@ class ExceptionHandlerTest extends TestCase
         $handler->sendPhpResponse(new \RuntimeException('Foo'));
         $response = ob_get_clean();
 
-        $this->assertContains('Whoops, looks like something went wrong.', $response);
-        $this->assertContains('<div class="trace trace-as-html">', $response);
+        $this->assertStringContainsString('Whoops, looks like something went wrong.', $response);
+        $this->assertStringContainsString('<div class="trace trace-as-html">', $response);
     }
 
     public function testStatusCode()
@@ -60,12 +60,12 @@ 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 +75,14 @@ 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());
     }
@@ -99,35 +99,65 @@ class ExceptionHandlerTest extends TestCase
 
     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

@@ -11,28 +11,32 @@
 
 namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
 
+use Composer\Autoload\ClassLoader as ComposerClassLoader;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\DebugClassLoader;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
-use Symfony\Component\Debug\DebugClassLoader;
-use Composer\Autoload\ClassLoader as ComposerClassLoader;
 
 class ClassNotFoundFatalErrorHandlerTest extends TestCase
 {
     public static function setUpBeforeClass()
     {
         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(\dirname(\dirname(\dirname(\dirname(__DIR__))))));
                 break;
             }
         }
@@ -61,7 +65,7 @@ class ClassNotFoundFatalErrorHandlerTest extends TestCase
         }
 
         $this->assertInstanceOf('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
-        $this->assertSame($translatedMessage, $exception->getMessage());
+        $this->assertRegExp($translatedMessage, $exception->getMessage());
         $this->assertSame($error['type'], $exception->getSeverity());
         $this->assertSame($error['file'], $exception->getFile());
         $this->assertSame($error['line'], $exception->getLine());
@@ -71,86 +75,90 @@ class ClassNotFoundFatalErrorHandlerTest extends TestCase
     {
         $autoloader = new ComposerClassLoader();
         $autoloader->add('Symfony\Component\Debug\Exception\\', realpath(__DIR__.'/../../Exception'));
+        $autoloader->add('Symfony_Component_Debug_Tests_Fixtures', realpath(__DIR__.'/../../Tests/Fixtures'));
 
-        $debugClassLoader = new DebugClassLoader(array($autoloader, 'loadClass'));
+        $debugClassLoader = new DebugClassLoader([$autoloader, '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?",
-            ),
-            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 \'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($autoloader, 'loadClass'),
-            ),
-            array(
-                array(
+                ],
+                "/^Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\\\\Bar\".\nDid you forget a \"use\" statement for \"Symfony\\\\Component\\\\Debug\\\\Exception\\\\UndefinedFunctionException\"\?$/",
+                [$autoloader, 'loadClass'],
+            ],
+            [
+                [
                     'type' => 1,
                     'line' => 12,
                     'file' => 'foo.php',
                     'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
-                ),
-                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
-                array($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()
@@ -161,12 +169,12 @@ 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']));

Tests/FatalErrorHandler/UndefinedFunctionFatalErrorHandlerTest.php

@@ -35,44 +35,44 @@ 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

@@ -34,43 +34,43 @@ 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::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 since version 3.4.
+     */
+    public function deprecatedMethod()
+    {
+    }
+}

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/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 $handler;
+    }
+
+    public function handleError($type, $message, $file, $line, $context)
+    {
+        return \call_user_func(self::$previous, $type, $message, $file, $line, $context);
+    }
+}

Tests/Fixtures/ExtendedFinalMethod.php

@@ -4,6 +4,8 @@ namespace Symfony\Component\Debug\Tests\Fixtures;
 
 class ExtendedFinalMethod extends FinalMethod
 {
+    use FinalMethod2Trait;
+
     /**
      * {@inheritdoc}
      */

Tests/Fixtures/FinalClasses.php

@@ -0,0 +1,85 @@
+<?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

@@ -11,6 +11,15 @@ class 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/InternalClass.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * @internal since version 3.4.
+ */
+class InternalClass
+{
+    use InternalTrait2;
+
+    public function usedInInternalClass()
+    {
+    }
+}

Tests/Fixtures/InternalInterface.php

@@ -3,8 +3,8 @@
 namespace Symfony\Component\Debug\Tests\Fixtures;
 
 /**
- * @final since version 3.3.
+ * @internal
  */
-class FinalClass
+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 since version 3.4
+     */
+    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 $context = [])
+    {
+        set_error_handler('is_string');
+        parent::log($level, $message, $context);
+        restore_error_handler();
+    }
+}

Tests/Fixtures/Throwing.php

@@ -1,5 +1,3 @@
 <?php
 
-if (!function_exists('__phpunit_run_isolated_test')) {
-    throw new \Exception('boo');
-}
+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/TraitWithInternalMethod.php

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

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 +1,27 @@
+--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--
+The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod()" method 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 "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 +1,47 @@
+--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--
+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 = [])
+        {
+            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 +1,42 @@
+--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 \Serializable
+    {
+    }
+}
+
+?>
+--EXPECTF--
+array(1) {
+  [0]=>
+  string(37) "Error and exception handlers do match"
+}
+object(Symfony\Component\Debug\Exception\FatalErrorException)#%d (%d) {
+  ["message":protected]=>
+  string(199) "Error: Class Symfony\Component\Debug\Broken contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods (Serializable::serialize, Serializable::unserialize)"
+%a
+}

composer.json

@@ -23,7 +23,7 @@
         "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
     },
     "require-dev": {
-        "symfony/http-kernel": "~2.8|~3.0"
+        "symfony/http-kernel": "~2.8|~3.0|~4.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Debug\\": "" },
@@ -34,7 +34,7 @@
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {
-            "dev-master": "3.3-dev"
+            "dev-master": "3.4-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"