Merge branch '3.4' into 4.2

* 3.4: [FrameworkBundle] [SecurityBundle] Rename internal WebTestCase to avoid confusion revert private properties handling [HttpFoundation] Fix URLs [VarDumper] finish PHP 7.4 support and add tests [VarDumper] Use \ReflectionReference for determining if a key is a reference (php >= 7.4) Ignore missing translation dependency in FrameworkBundle [Debug][ExceptionHandler] Add tests for custom handlers
minor #32619 [Debug][ExceptionHandler] Add tests for custom handlers (fancyweb)
2026-03-25 17:52:07 +01:00 · 2019-07-23 11:50:15 +02:00 · 2019-07-23 10:39:19 +02:00 · 2019-07-19 14:05:51 +02:00 · 2019-07-19 14:05:10 +02:00 · 2019-07-19 13:52:08 +02:00
35 changed files with 926 additions and 460 deletions
--- a/BufferingLogger.php
+++ b/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;
    }
--- a/Debug.php
+++ b/Debug.php
@@ -42,7 +42,7 @@ class Debug
            error_reporting(E_ALL);
        }

-        if (!\in_array(\PHP_SAPI, array('cli', 'phpdbg'), true)) {
+        if (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
            ini_set('display_errors', 0);
            ExceptionHandler::register();
        } elseif ($displayErrors && (!filter_var(ini_get('log_errors'), FILTER_VALIDATE_BOOLEAN) || ini_get('error_log'))) {
--- a/DebugClassLoader.php
+++ b/DebugClassLoader.php
@@ -11,6 +11,8 @@

 namespace Symfony\Component\Debug;

+use PHPUnit\Framework\MockObject\Matcher\StatelessInvocation;
+
 /**
 * Autoloader checking if the class is really defined in the file found.
 *
@@ -21,20 +23,22 @@ namespace Symfony\Component\Debug;
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Christophe Coevoet <stof@notk.org>
 * @author Nicolas Grekas <p@tchwork.com>
+ * @author Guilhem Niot <guilhem.niot@gmail.com>
 */
 class DebugClassLoader
 {
    private $classLoader;
    private $isFinder;
-    private $loaded = array();
+    private $loaded = [];
    private static $caseCheck;
-    private static $checkedClasses = array();
-    private static $final = array();
-    private static $finalMethods = array();
-    private static $deprecated = array();
-    private static $internal = array();
-    private static $internalMethods = array();
-    private static $darwinCache = array('/' => array('/', array()));
+    private static $checkedClasses = [];
+    private static $final = [];
+    private static $finalMethods = [];
+    private static $deprecated = [];
+    private static $internal = [];
+    private static $internalMethods = [];
+    private static $annotatedParameters = [];
+    private static $darwinCache = ['/' => ['/', []]];

    public function __construct(callable $classLoader)
    {
@@ -94,7 +98,7 @@ class DebugClassLoader

        foreach ($functions as $function) {
            if (!\is_array($function) || !$function[0] instanceof self) {
-                $function = array(new static($function), 'loadClass');
+                $function = [new static($function), 'loadClass'];
            }

            spl_autoload_register($function);
@@ -123,6 +127,14 @@ 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.
     *
@@ -140,14 +152,14 @@ class DebugClassLoader
                if (!$file = $this->classLoader[0]->findFile($class) ?: false) {
                    // no-op
                } elseif (\function_exists('opcache_is_script_cached') && @opcache_is_script_cached($file)) {
-                    require $file;
+                    include $file;

                    return;
-                } else {
-                    require $file;
+                } elseif (false === include $file) {
+                    return;
                }
            } else {
-                \call_user_func($this->classLoader, $class);
+                ($this->classLoader)($class);
                $file = false;
            }
        } finally {
@@ -159,7 +171,7 @@ class DebugClassLoader

    private function checkClass($class, $file = null)
    {
-        $exists = null === $file || \class_exists($class, false) || \interface_exists($class, false) || \trait_exists($class, false);
+        $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);
@@ -177,7 +189,7 @@ class DebugClassLoader
            }
            $name = $refl->getName();

-            if ($name !== $class && 0 === \strcasecmp($name, $class)) {
+            if ($name !== $class && 0 === strcasecmp($name, $class)) {
                throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: "%s" vs "%s".', $class, $name));
            }

@@ -207,26 +219,26 @@ class DebugClassLoader

    public function checkAnnotations(\ReflectionClass $refl, $class)
    {
-        $deprecations = array();
+        $deprecations = [];

        // Don't trigger deprecations for classes in the same vendor
-        if (2 > $len = 1 + (\strpos($class, '\\') ?: \strpos($class, '_'))) {
+        if (2 > $len = 1 + (strpos($class, '\\') ?: strpos($class, '_'))) {
            $len = 0;
            $ns = '';
        } else {
-            $ns = \substr($class, 0, $len);
+            $ns = str_replace('_', '\\', substr($class, 0, $len));
        }

        // Detect annotations on the class
        if (false !== $doc = $refl->getDocComment()) {
-            foreach (array('final', 'deprecated', 'internal') as $annotation) {
-                if (false !== \strpos($doc, $annotation) && preg_match('#\n \* @'.$annotation.'(?:( .+?)\.?)?\r?\n \*(?: @|/$)#s', $doc, $notice)) {
-                    self::${$annotation}[$class] = isset($notice[1]) ? preg_replace('#\s*\r?\n \* +#', ' ', $notice[1]) : '';
+            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);
+        $parent = get_parent_class($class);
        $parentAndOwnInterfaces = $this->getOwnInterfaces($class, $parent);
        if ($parent) {
            $parentAndOwnInterfaces[$parent] = $parent;
@@ -241,30 +253,31 @@ class DebugClassLoader
        }

        // Detect if the parent is annotated
-        foreach ($parentAndOwnInterfaces + \class_uses($class, false) as $use) {
+        foreach ($parentAndOwnInterfaces + class_uses($class, false) as $use) {
            if (!isset(self::$checkedClasses[$use])) {
                $this->checkClass($use);
            }
-            if (isset(self::$deprecated[$use]) && \strncmp($ns, $use, $len)) {
+            if (isset(self::$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, $use, $len)) {
+            if (isset(self::$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($class)) {
+        if (trait_exists($class)) {
            return $deprecations;
        }

-        // Inherit @final and @internal annotations for methods
-        self::$finalMethods[$class] = array();
-        self::$internalMethods[$class] = array();
+        // Inherit @final, @internal and @param annotations for methods
+        self::$finalMethods[$class] = [];
+        self::$internalMethods[$class] = [];
+        self::$annotatedParameters[$class] = [];
        foreach ($parentAndOwnInterfaces as $use) {
-            foreach (array('finalMethods', 'internalMethods') as $property) {
+            foreach (['finalMethods', 'internalMethods', 'annotatedParameters'] as $property) {
                if (isset(self::${$property}[$use])) {
                    self::${$property}[$class] = self::${$property}[$class] ? self::${$property}[$use] + self::${$property}[$class] : self::${$property}[$use];
                }
@@ -283,20 +296,57 @@ class DebugClassLoader

            if (isset(self::$internalMethods[$class][$method->name])) {
                list($declaringClass, $message) = self::$internalMethods[$class][$method->name];
-                if (\strncmp($ns, $declaringClass, $len)) {
+                if (strncmp($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()) {
+            // To read method annotations
+            $doc = $method->getDocComment();
+
+            if (isset(self::$annotatedParameters[$class][$method->name])) {
+                $definedParameters = [];
+                foreach ($method->getParameters() as $parameter) {
+                    $definedParameters[$parameter->name] = true;
+                }
+
+                foreach (self::$annotatedParameters[$class][$method->name] as $parameterName => $deprecation) {
+                    if (!isset($definedParameters[$parameterName]) && !($doc && preg_match("/\\n\\s+\\* @param (.*?)(?<= )\\\${$parameterName}\\b/", $doc))) {
+                        $deprecations[] = sprintf($deprecation, $class);
+                    }
+                }
+            }
+
+            if (!$doc) {
                continue;
            }

-            foreach (array('final', 'internal') as $annotation) {
-                if (false !== \strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$)#s', $doc, $notice)) {
-                    $message = isset($notice[1]) ? preg_replace('#\s*\r?\n \* +#', ' ', $notice[1]) : '';
-                    self::${$annotation.'Methods'}[$class][$method->name] = array($class, $message);
+            $finalOrInternal = false;
+
+            foreach (['final', 'internal'] as $annotation) {
+                if (false !== strpos($doc, $annotation) && preg_match('#\n\s+\* @'.$annotation.'(?:( .+?)\.?)?\r?\n\s+\*(?: @|/$|\r?\n)#s', $doc, $notice)) {
+                    $message = isset($notice[1]) ? preg_replace('#\.?\r?\n( \*)? *(?= |\r?\n|$)#', '', $notice[1]) : '';
+                    self::${$annotation.'Methods'}[$class][$method->name] = [$class, $message];
+                    $finalOrInternal = true;
+                }
+            }
+
+            if ($finalOrInternal || $method->isConstructor() || false === strpos($doc, '@param') || StatelessInvocation::class === $class) {
+                continue;
+            }
+            if (!preg_match_all('#\n\s+\* @param (.*?)(?<= )\$([a-zA-Z0-9_\x7f-\xff]++)#', $doc, $matches, PREG_SET_ORDER)) {
+                continue;
+            }
+            if (!isset(self::$annotatedParameters[$class][$method->name])) {
+                $definedParameters = [];
+                foreach ($method->getParameters() as $parameter) {
+                    $definedParameters[$parameter->name] = true;
+                }
+            }
+            foreach ($matches as list(, $parameterType, $parameterName)) {
+                if (!isset($definedParameters[$parameterName])) {
+                    $parameterType = trim($parameterType);
+                    self::$annotatedParameters[$class][$method->name][$parameterName] = sprintf('The "%%s::%s()" method will require a new "%s$%s" argument in the next major version of its parent class "%s", not defining it is deprecated.', $method->name, $parameterType ? $parameterType.' ' : '', $parameterName, $method->class);
                }
            }
        }
@@ -334,7 +384,7 @@ class DebugClassLoader
        if (0 === substr_compare($real, $tail, -$tailLen, $tailLen, true)
            && 0 !== substr_compare($real, $tail, -$tailLen, $tailLen, false)
        ) {
-            return array(substr($tail, -$tailLen + 1), substr($real, -$tailLen + 1), substr($real, 0, -$tailLen + 1));
+            return [substr($tail, -$tailLen + 1), substr($real, -$tailLen + 1), substr($real, 0, -$tailLen + 1)];
        }
    }

@@ -364,7 +414,7 @@ class DebugClassLoader
                $k = $kDir;
                $i = \strlen($dir) - 1;
                while (!isset(self::$darwinCache[$k])) {
-                    self::$darwinCache[$k] = array($dir, array());
+                    self::$darwinCache[$k] = [$dir, []];
                    self::$darwinCache[$dir] = &self::$darwinCache[$k];

                    while ('/' !== $dir[--$i]) {
@@ -377,6 +427,11 @@ class DebugClassLoader

        $dirFiles = self::$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];
        }
--- a/ErrorHandler.php
+++ b/ErrorHandler.php
@@ -15,6 +15,7 @@ use Psr\Log\LoggerInterface;
 use Psr\Log\LogLevel;
 use Symfony\Component\Debug\Exception\FatalErrorException;
 use Symfony\Component\Debug\Exception\FatalThrowableError;
+use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
 use Symfony\Component\Debug\Exception\SilencedErrorContext;
 use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
@@ -47,7 +48,7 @@ use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
 */
 class ErrorHandler
 {
-    private $levels = array(
+    private $levels = [
        E_DEPRECATED => 'Deprecated',
        E_USER_DEPRECATED => 'User Deprecated',
        E_NOTICE => 'Notice',
@@ -63,25 +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
@@ -97,7 +98,7 @@ class ErrorHandler

    private static $reservedMemory;
    private static $toStringException = null;
-    private static $silencedErrorCache = array();
+    private static $silencedErrorCache = [];
    private static $silencedErrorCount = 0;
    private static $exitCode = 0;

@@ -120,10 +121,10 @@ 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;
        }

@@ -137,12 +138,12 @@ class ErrorHandler
        } else {
            $handlerIsRegistered = true;
        }
-        if (\is_array($prev = set_exception_handler(array($handler, 'handleException'))) && $prev[0] instanceof self) {
+        if (\is_array($prev = set_exception_handler([$handler, 'handleException'])) && $prev[0] instanceof self) {
            restore_exception_handler();
            if (!$handlerIsRegistered) {
                $handler = $prev[0];
            } elseif ($handler !== $prev[0] && $replace) {
-                set_exception_handler(array($handler, 'handleException'));
+                set_exception_handler([$handler, 'handleException']);
                $p = $prev[0]->setExceptionHandler(null);
                $handler->setExceptionHandler($p);
                $prev[0]->setExceptionHandler($p);
@@ -175,12 +176,12 @@ class ErrorHandler
     */
    public function setDefaultLogger(LoggerInterface $logger, $levels = E_ALL, $replace = false)
    {
-        $loggers = array();
+        $loggers = [];

        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 {
@@ -211,15 +212,15 @@ 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)) {
+                $log = [$log];
+            } elseif (!\array_key_exists(0, $log)) {
                throw new \InvalidArgumentException('No logger provided');
            }
            if (null === $log[0]) {
@@ -355,9 +356,9 @@ class ErrorHandler
            if ($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([$this, 'handleError']);
                }
            }
        }
@@ -379,6 +380,11 @@ class ErrorHandler
     */
    public function handleError($type, $message, $file, $line)
    {
+        // @deprecated to be removed in Symfony 5.0
+        if (\PHP_VERSION_ID >= 70300 && $message && '"' === $message[0] && 0 === strpos($message, '"continue') && preg_match('/^"continue(?: \d++)?" targeting switch is equivalent to "break(?: \d++)?"\. Did you mean to use "continue(?: \d++)?"\?$/', $message)) {
+            $type = E_DEPRECATED;
+        }
+
        // Level is the current error reporting level to manage silent error.
        $level = error_reporting();
        $silenced = 0 === ($level & $type);
@@ -394,9 +400,9 @@ class ErrorHandler
        $scope = $this->scopedErrors & $type;

        if (4 < $numArgs = \func_num_args()) {
-            $context = $scope ? (func_get_arg(4) ?: array()) : array();
+            $context = $scope ? (func_get_arg(4) ?: []) : [];
        } else {
-            $context = array();
+            $context = [];
        }

        if (isset($context['GLOBALS']) && $scope) {
@@ -405,26 +411,30 @@ class ErrorHandler
            $context = $e;
        }

-        $logMessage = $this->levels[$type].': '.$message;
+        if (false !== strpos($message, "class@anonymous\0")) {
+            $logMessage = $this->levels[$type].': '.(new FlattenException())->setMessage($message)->getMessage();
+        } else {
+            $logMessage = $this->levels[$type].': '.$message;
+        }

        if (null !== self::$toStringException) {
            $errorAsException = self::$toStringException;
            self::$toStringException = null;
        } elseif (!$throw && !($type & $level)) {
            if (!isset(self::$silencedErrorCache[$id = $file.':'.$line])) {
-                $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 = $this->tracedErrors & $type ? $this->cleanTrace(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 5), $type, $file, $line, false) : [];
+                $errorAsException = new SilencedErrorContext($type, $file, $line, isset($lightTrace[1]) ? [$lightTrace[0]] : $lightTrace);
            } elseif (isset(self::$silencedErrorCache[$id][$message])) {
                $lightTrace = null;
                $errorAsException = self::$silencedErrorCache[$id][$message];
                ++$errorAsException->count;
            } else {
-                $lightTrace = array();
+                $lightTrace = [];
                $errorAsException = null;
            }

            if (100 < ++self::$silencedErrorCount) {
-                self::$silencedErrorCache = $lightTrace = array();
+                self::$silencedErrorCache = $lightTrace = [];
                self::$silencedErrorCount = 1;
            }
            if ($errorAsException) {
@@ -436,14 +446,13 @@ class ErrorHandler
        } else {
            $errorAsException = new \ErrorException($logMessage, 0, $type, $file, $line);

-            // Clean the trace by removing function arguments and the first frames added by the error handler itself.
            if ($throw || $this->tracedErrors & $type) {
                $backtrace = $errorAsException->getTrace();
                $lightTrace = $this->cleanTrace($backtrace, $type, $file, $line, $throw);
                $this->traceReflector->setValue($errorAsException, $lightTrace);
            } else {
-                $this->traceReflector->setValue($errorAsException, array());
-                $backtrace = array();
+                $this->traceReflector->setValue($errorAsException, []);
+                $backtrace = [];
            }
        }

@@ -486,12 +495,21 @@ class ErrorHandler
        if ($this->isRecursive) {
            $log = 0;
        } 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, $errorAsException ? array('exception' => $errorAsException) : array());
+                $this->loggers[$type][0]->log($level, $logMessage, $errorAsException ? ['exception' => $errorAsException] : []);
            } finally {
                $this->isRecursive = false;
+
+                if (!\defined('HHVM_VERSION')) {
+                    set_error_handler($currentErrorHandler);
+                }
            }
        }

@@ -518,26 +536,29 @@ class ErrorHandler
        $handlerException = null;

        if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
+            if (false !== strpos($message = $exception->getMessage(), "class@anonymous\0")) {
+                $message = (new FlattenException())->setMessage($message)->getMessage();
+            }
            if ($exception instanceof FatalErrorException) {
                if ($exception instanceof FatalThrowableError) {
-                    $error = array(
+                    $error = [
                        'type' => $type,
-                        'message' => $message = $exception->getMessage(),
+                        'message' => $message,
                        'file' => $exception->getFile(),
                        'line' => $exception->getLine(),
-                    );
+                    ];
                } else {
-                    $message = 'Fatal '.$exception->getMessage();
+                    $message = 'Fatal '.$message;
                }
            } elseif ($exception instanceof \ErrorException) {
-                $message = 'Uncaught '.$exception->getMessage();
+                $message = 'Uncaught '.$message;
            } else {
-                $message = 'Uncaught Exception: '.$exception->getMessage();
+                $message = 'Uncaught Exception: '.$message;
            }
        }
        if ($this->loggedErrors & $type) {
            try {
-                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, array('exception' => $exception));
+                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, ['exception' => $exception]);
            } catch (\Throwable $handlerException) {
            }
        }
@@ -553,7 +574,7 @@ class ErrorHandler
        $this->exceptionHandler = null;
        try {
            if (null !== $exceptionHandler) {
-                return \call_user_func($exceptionHandler, $exception);
+                return $exceptionHandler($exception);
            }
            $handlerException = $handlerException ?: $exception;
        } catch (\Throwable $handlerException) {
@@ -579,7 +600,7 @@ class ErrorHandler
        }

        $handler = self::$reservedMemory = null;
-        $handlers = array();
+        $handlers = [];
        $previousHandler = null;
        $sameHandlerLimit = 10;

@@ -610,7 +631,7 @@ class ErrorHandler
            $handler[0]->setExceptionHandler($h);
        }
        $handler = $handler[0];
-        $handlers = array();
+        $handlers = [];

        if ($exit = null === $error) {
            $error = error_get_last();
@@ -654,13 +675,16 @@ class ErrorHandler
     */
    protected function getFatalErrorHandlers()
    {
-        return array(
+        return [
            new UndefinedFunctionFatalErrorHandler(),
            new UndefinedMethodFatalErrorHandler(),
            new ClassNotFoundFatalErrorHandler(),
-        );
+        ];
    }

+    /**
+     * Cleans the trace by removing function arguments and the frames added by the error handler and DebugClassLoader.
+     */
    private function cleanTrace($backtrace, $type, $file, $line, $throw)
    {
        $lightTrace = $backtrace;
@@ -671,6 +695,13 @@ class ErrorHandler
                break;
            }
        }
+        if (class_exists(DebugClassLoader::class, false)) {
+            for ($i = \count($lightTrace) - 2; 0 < $i; --$i) {
+                if (DebugClassLoader::class === ($lightTrace[$i]['class'] ?? null)) {
+                    array_splice($lightTrace, --$i, 2);
+                }
+            }
+        }
        if (!($throw || $this->scopedErrors & $type)) {
            for ($i = 0; isset($lightTrace[$i]); ++$i) {
                unset($lightTrace[$i]['args'], $lightTrace[$i]['object']);
--- a/Exception/FatalErrorException.php
+++ b/Exception/FatalErrorException.php
@@ -61,7 +61,7 @@ class FatalErrorException extends \ErrorException
                unset($frame);
                $trace = array_reverse($trace);
            } else {
-                $trace = array();
+                $trace = [];
            }

            $this->setTrace($trace);
--- a/Exception/FlattenException.php
+++ b/Exception/FlattenException.php
@@ -33,12 +33,12 @@ 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 $headers = [])
    {
        return static::createFromThrowable($exception, $statusCode, $headers);
    }

-    public static function createFromThrowable(\Throwable $exception, ?int $statusCode = null, array $headers = array()): self
+    public static function createFromThrowable(\Throwable $exception, ?int $statusCode = null, array $headers = []): self
    {
        $e = new static();
        $e->setMessage($exception->getMessage());
@@ -73,13 +73,13 @@ 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;
@@ -90,9 +90,14 @@ class FlattenException
        return $this->statusCode;
    }

+    /**
+     * @return $this
+     */
    public function setStatusCode($code)
    {
        $this->statusCode = $code;
+
+        return $this;
    }

    public function getHeaders()
@@ -100,9 +105,14 @@ class FlattenException
        return $this->headers;
    }

+    /**
+     * @return $this
+     */
    public function setHeaders(array $headers)
    {
        $this->headers = $headers;
+
+        return $this;
    }

    public function getClass()
@@ -110,9 +120,14 @@ class FlattenException
        return $this->class;
    }

+    /**
+     * @return $this
+     */
    public function setClass($class)
    {
-        $this->class = $class;
+        $this->class = 'c' === $class[0] && 0 === strpos($class, "class@anonymous\0") ? get_parent_class($class).'@anonymous' : $class;
+
+        return $this;
    }

    public function getFile()
@@ -120,9 +135,14 @@ class FlattenException
        return $this->file;
    }

+    /**
+     * @return $this
+     */
    public function setFile($file)
    {
        $this->file = $file;
+
+        return $this;
    }

    public function getLine()
@@ -130,9 +150,14 @@ class FlattenException
        return $this->line;
    }

+    /**
+     * @return $this
+     */
    public function setLine($line)
    {
        $this->line = $line;
+
+        return $this;
    }

    public function getMessage()
@@ -140,9 +165,20 @@ class FlattenException
        return $this->message;
    }

+    /**
+     * @return $this
+     */
    public function setMessage($message)
    {
+        if (false !== strpos($message, "class@anonymous\0")) {
+            $message = preg_replace_callback('/class@anonymous\x00.*?\.php0x?[0-9a-fA-F]++/', function ($m) {
+                return class_exists($m[0], false) ? get_parent_class($m[0]).'@anonymous' : $m[0];
+            }, $message);
+        }
+
        $this->message = $message;
+
+        return $this;
    }

    public function getCode()
@@ -150,9 +186,14 @@ class FlattenException
        return $this->code;
    }

+    /**
+     * @return $this
+     */
    public function setCode($code)
    {
        $this->code = $code;
+
+        return $this;
    }

    public function getPrevious()
@@ -160,14 +201,19 @@ class FlattenException
        return $this->previous;
    }

+    /**
+     * @return $this
+     */
    public function setPrevious(self $previous)
    {
        $this->previous = $previous;
+
+        return $this;
    }

    public function getAllPrevious()
    {
-        $exceptions = array();
+        $exceptions = [];
        $e = $this;
        while ($e = $e->getPrevious()) {
            $exceptions[] = $e;
@@ -191,15 +237,18 @@ class FlattenException
        $this->setTraceFromThrowable($exception);
    }

-    public function setTraceFromThrowable(\Throwable $throwable): void
+    public function setTraceFromThrowable(\Throwable $throwable)
    {
-        $this->setTrace($throwable->getTrace(), $throwable->getFile(), $throwable->getLine());
+        return $this->setTrace($throwable->getTrace(), $throwable->getFile(), $throwable->getLine());
    }

+    /**
+     * @return $this
+     */
    public function setTrace($trace, $file, $line)
    {
-        $this->trace = array();
-        $this->trace[] = array(
+        $this->trace = [];
+        $this->trace[] = [
            'namespace' => '',
            'short_class' => '',
            'class' => '',
@@ -207,8 +256,8 @@ class FlattenException
            'function' => '',
            'file' => $file,
            'line' => $line,
-            'args' => array(),
-        );
+            'args' => [],
+        ];
        foreach ($trace as $entry) {
            $class = '';
            $namespace = '';
@@ -218,7 +267,7 @@ class FlattenException
                $namespace = implode('\\', $parts);
            }

-            $this->trace[] = array(
+            $this->trace[] = [
                'namespace' => $namespace,
                'short_class' => $class,
                'class' => isset($entry['class']) ? $entry['class'] : '',
@@ -226,41 +275,43 @@ class FlattenException
                'function' => isset($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']) : [],
+            ];
        }
+
+        return $this;
    }

    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));
+                $result[$key] = ['incomplete-object', $this->getClassNameFromIncomplete($value)];
            } elseif (\is_object($value)) {
-                $result[$key] = array('object', \get_class($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);
+                $result[$key] = ['null', null];
            } elseif (\is_bool($value)) {
-                $result[$key] = array('boolean', $value);
+                $result[$key] = ['boolean', $value];
            } elseif (\is_int($value)) {
-                $result[$key] = array('integer', $value);
+                $result[$key] = ['integer', $value];
            } elseif (\is_float($value)) {
-                $result[$key] = array('float', $value);
+                $result[$key] = ['float', $value];
            } elseif (\is_resource($value)) {
-                $result[$key] = array('resource', get_resource_type($value));
+                $result[$key] = ['resource', get_resource_type($value)];
            } else {
-                $result[$key] = array('string', (string) $value);
+                $result[$key] = ['string', (string) $value];
            }
        }

--- a/Exception/SilencedErrorContext.php
+++ b/Exception/SilencedErrorContext.php
@@ -25,7 +25,7 @@ class SilencedErrorContext implements \JsonSerializable
    private $line;
    private $trace;

-    public function __construct(int $severity, string $file, int $line, array $trace = array(), int $count = 1)
+    public function __construct(int $severity, string $file, int $line, array $trace = [], int $count = 1)
    {
        $this->severity = $severity;
        $this->file = $file;
@@ -56,12 +56,12 @@ class SilencedErrorContext implements \JsonSerializable

    public function JsonSerialize()
    {
-        return array(
+        return [
            'severity' => $this->severity,
            'file' => $this->file,
            'line' => $this->line,
            'trace' => $this->trace,
            'count' => $this->count,
-        );
+        ];
    }
 }
--- a/ExceptionHandler.php
+++ b/ExceptionHandler.php
--- a/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
+++ b/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
@@ -40,7 +40,7 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
            return;
        }

-        foreach (array('class', 'interface', 'trait') as $typeName) {
+        foreach (['class', 'interface', 'trait'] as $typeName) {
            $prefix = ucfirst($typeName).' \'';
            $prefixLen = \strlen($prefix);
            if (0 !== strpos($error['message'], $prefix)) {
@@ -86,11 +86,11 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
    private function getClassCandidates(string $class): array
    {
        if (!\is_array($functions = spl_autoload_functions())) {
-            return array();
+            return [];
        }

        // find Symfony and Composer autoloaders
-        $classes = array();
+        $classes = [];

        foreach ($functions as $function) {
            if (!\is_array($function)) {
@@ -127,10 +127,10 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
    private function findClassInPath(string $path, string $class, string $prefix): array
    {
        if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.\dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
-            return array();
+            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)) {
@@ -143,9 +143,9 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface

    private function convertFileToClass(string $path, string $file, string $prefix): ?string
    {
-        $candidates = array(
+        $candidates = [
            // namespaced class
-            $namespacedClass = str_replace(array($path.\DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            $namespacedClass = str_replace([$path.\DIRECTORY_SEPARATOR, '.php', '/'], ['', '', '\\'], $file),
            // namespaced class (with target dir)
            $prefix.$namespacedClass,
            // namespaced class (with target dir and separator)
@@ -156,7 +156,7 @@ 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); });
@@ -171,7 +171,11 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
            }
        }

-        require_once $file;
+        try {
+            require_once $file;
+        } catch (\Throwable $e) {
+            return null;
+        }

        foreach ($candidates as $candidate) {
            if ($this->classExists($candidate)) {
--- a/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
+++ b/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
@@ -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, '\\')) {
--- a/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
+++ b/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
@@ -41,7 +41,7 @@ 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)) {
--- a/2
+++ b/2
@@ -1,4 +1,4 @@
-Copyright (c) 2004-2018 Fabien Potencier
+Copyright (c) 2004-2019 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
--- a/Tests/DebugClassLoaderTest.php
+++ b/Tests/DebugClassLoaderTest.php
@@ -27,14 +27,14 @@ 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);
    }

@@ -44,7 +44,7 @@ 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);
@@ -136,20 +136,20 @@ class DebugClassLoaderTest extends TestCase
        $lastError = error_get_last();
        unset($lastError['file'], $lastError['line']);

-        $xError = array(
+        $xError = [
            'type' => E_USER_DEPRECATED,
            'message' => 'The "Test\Symfony\Component\Debug\Tests\\'.$class.'" class '.$type.' "Symfony\Component\Debug\Tests\Fixtures\\'.$super.'" that is deprecated but this is a test deprecation notice.',
-        );
+        ];

        $this->assertSame($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()
@@ -166,10 +166,10 @@ class DebugClassLoaderTest extends TestCase
        $lastError = error_get_last();
        unset($lastError['file'], $lastError['line']);

-        $xError = array(
+        $xError = [
            'type' => E_USER_NOTICE,
            'message' => '',
-        );
+        ];

        $this->assertSame($xError, $lastError);
    }
@@ -188,39 +188,46 @@ class DebugClassLoaderTest extends TestCase
        $lastError = error_get_last();
        unset($lastError['file'], $lastError['line']);

-        $xError = array(
+        $xError = [
            'type' => E_USER_NOTICE,
            'message' => '',
-        );
+        ];

        $this->assertSame($xError, $lastError);
    }

    public function 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 = __NAMESPACE__.'\\Fixtures\\FinalClass'.$i++, false)) {
+            spl_autoload_call($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. 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 = array();
+        $deprecations = [];
        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
        $e = error_reporting(E_USER_DEPRECATED);

@@ -229,10 +236,10 @@ class DebugClassLoaderTest extends TestCase
        error_reporting($e);
        restore_error_handler();

-        $xError = array(
+        $xError = [
            'The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".',
            'The "Symfony\Component\Debug\Tests\Fixtures\FinalMethod::finalMethod2()" method is considered final. It may change without further notice as of its next major version. You should not extend it from "Symfony\Component\Debug\Tests\Fixtures\ExtendedFinalMethod".',
-        );
+        ];

        $this->assertSame($xError, $deprecations);
    }
@@ -251,12 +258,12 @@ class DebugClassLoaderTest extends TestCase
        $lastError = error_get_last();
        unset($lastError['file'], $lastError['line']);

-        $this->assertSame(array('type' => E_USER_NOTICE, 'message' => ''), $lastError);
+        $this->assertSame(['type' => E_USER_NOTICE, 'message' => ''], $lastError);
    }

    public function testInternalsUse()
    {
-        $deprecations = array();
+        $deprecations = [];
        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
        $e = error_reporting(E_USER_DEPRECATED);

@@ -265,17 +272,35 @@ class DebugClassLoaderTest extends TestCase
        error_reporting($e);
        restore_error_handler();

-        $this->assertSame($deprecations, array(
+        $this->assertSame($deprecations, [
            'The "Symfony\Component\Debug\Tests\Fixtures\InternalInterface" interface is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternalsParent".',
            'The "Symfony\Component\Debug\Tests\Fixtures\InternalClass" class is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternalsParent".',
            'The "Symfony\Component\Debug\Tests\Fixtures\InternalTrait" trait is considered internal. It may change without further notice. You should not use it from "Test\Symfony\Component\Debug\Tests\ExtendsInternals".',
            'The "Symfony\Component\Debug\Tests\Fixtures\InternalClass::internalMethod()" method is considered internal. It may change without further notice. You should not extend it from "Test\Symfony\Component\Debug\Tests\ExtendsInternals".',
-        ));
+        ]);
+    }
+
+    public function testExtendedMethodDefinesNewParameters()
+    {
+        $deprecations = [];
+        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
+        $e = error_reporting(E_USER_DEPRECATED);
+
+        class_exists(__NAMESPACE__.'\\Fixtures\SubClassWithAnnotatedParameters', true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $this->assertSame([
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::quzMethod()" method will require a new "Quz $quz" argument in the next major version of its parent class "Symfony\Component\Debug\Tests\Fixtures\ClassWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::whereAmI()" method will require a new "bool $matrix" argument in the next major version of its parent class "Symfony\Component\Debug\Tests\Fixtures\InterfaceWithAnnotatedParameters", not defining it is deprecated.',
+            'The "Symfony\Component\Debug\Tests\Fixtures\SubClassWithAnnotatedParameters::isSymfony()" method will require a new "true $yes" argument in the next major version of its parent class "Symfony\Component\Debug\Tests\Fixtures\ClassWithAnnotatedParameters", not defining it is deprecated.',
+        ], $deprecations);
    }

    public function testUseTraitWithInternalMethod()
    {
-        $deprecations = array();
+        $deprecations = [];
        set_error_handler(function ($type, $msg) use (&$deprecations) { $deprecations[] = $msg; });
        $e = error_reporting(E_USER_DEPRECATED);

@@ -284,7 +309,12 @@ class DebugClassLoaderTest extends TestCase
        error_reporting($e);
        restore_error_handler();

-        $this->assertSame(array(), $deprecations);
+        $this->assertSame([], $deprecations);
+    }
+
+    public function testEvaluatedCode()
+    {
+        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\DefinitionInEvaluatedCode', true));
    }
 }

@@ -296,12 +326,12 @@ 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) {
            eval('-- parse error --');
@@ -310,7 +340,7 @@ class ClassLoader
        } elseif (__NAMESPACE__.'\TestingCaseMismatch' === $class) {
            eval('namespace '.__NAMESPACE__.'; class TestingCaseMisMatch {}');
        } 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) {
@@ -325,8 +355,9 @@ class ClassLoader
            eval('namespace Test\\'.__NAMESPACE__.'; class NonDeprecatedInterfaceClass implements \\'.__NAMESPACE__.'\Fixtures\NonDeprecatedInterface {}');
        } elseif ('Test\\'.__NAMESPACE__.'\Float' === $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\\'.__NAMESPACE__.'\ExtendsFinalClass')) {
+            $classShortName = substr($class, strrpos($class, '\\') + 1);
+            eval('namespace Test\\'.__NAMESPACE__.'; class '.$classShortName.' extends \\'.__NAMESPACE__.'\Fixtures\\'.substr($classShortName, 7).' {}');
        } elseif ('Test\\'.__NAMESPACE__.'\ExtendsAnnotatedClass' === $class) {
            eval('namespace Test\\'.__NAMESPACE__.'; class ExtendsAnnotatedClass extends \\'.__NAMESPACE__.'\Fixtures\AnnotatedClass {
                public function deprecatedMethod() { }
--- a/Tests/ErrorHandlerTest.php
+++ b/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.
@@ -38,13 +41,13 @@ class ErrorHandlerTest extends TestCase
            $this->assertSame($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) {
            }

@@ -67,19 +70,19 @@ class ErrorHandlerTest extends TestCase

    public function testErrorGetLast()
    {
-        $handler = ErrorHandler::register();
        $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 = array(
+            $expected = [
                'type' => E_USER_WARNING,
                'message' => 'Hello',
                'file' => __FILE__,
                'line' => __LINE__ - 5,
-            );
+            ];
            $this->assertSame($expected, error_get_last());
        } catch (\Exception $e) {
            restore_error_handler();
@@ -140,31 +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();
@@ -176,14 +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();
@@ -191,7 +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());
@@ -204,14 +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();
@@ -231,12 +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();
@@ -259,7 +261,7 @@ class ErrorHandlerTest extends TestCase
            $logger
                ->expects($this->once())
                ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
            ;

            $handler = ErrorHandler::register();
@@ -315,23 +317,24 @@ 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();
    }

    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);
@@ -341,7 +344,7 @@ class ErrorHandlerTest extends TestCase
            $logger
                ->expects($this->exactly(2))
                ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
            ;

            $handler->setDefaultLogger($logger, E_ERROR);
@@ -369,27 +372,27 @@ 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();

@@ -405,14 +408,14 @@ 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]]);
    }

    public function testSettingLoggerWhenExceptionIsBuffered()
@@ -425,7 +428,7 @@ 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);
@@ -437,16 +440,15 @@ class ErrorHandlerTest extends TestCase
    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);
@@ -457,7 +459,7 @@ class ErrorHandlerTest extends TestCase
            $logger
                ->expects($this->once())
                ->method('log')
-                ->will($this->returnCallback($logArgCheck))
+                ->willReturnCallback($logArgCheck)
            ;

            $handler->setDefaultLogger($logger, E_PARSE);
@@ -476,7 +478,7 @@ 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) {
@@ -486,7 +488,7 @@ class ErrorHandlerTest extends TestCase
        $handler->handleException($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());
    }

    /**
@@ -501,4 +503,58 @@ class ErrorHandlerTest extends TestCase

        $handler->handleException(new \Exception());
    }
+
+    /**
+     * @dataProvider errorHandlerWhenLoggingProvider
+     */
+    public function testErrorHandlerWhenLogging($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];
+                }
+            }
+        }
+    }
 }
--- a/Tests/Exception/FlattenExceptionTest.php
+++ b/Tests/Exception/FlattenExceptionTest.php
@@ -61,7 +61,7 @@ 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());
@@ -96,23 +96,23 @@ 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());
    }

    /**
@@ -162,7 +162,7 @@ class FlattenExceptionTest extends TestCase

        $this->assertSame($flattened2, $flattened->getPrevious());

-        $this->assertSame(array($flattened2), $flattened->getAllPrevious());
+        $this->assertSame([$flattened2], $flattened->getAllPrevious());
    }

    public function testPreviousError()
@@ -200,18 +200,18 @@ class FlattenExceptionTest extends TestCase
    public function testToArray(\Throwable $exception, string $expectedClass)
    {
        $flattened = FlattenException::createFromThrowable($exception);
-        $flattened->setTrace(array(), 'foo.php', 123);
+        $flattened->setTrace([], 'foo.php', 123);

-        $this->assertEquals(array(
-            array(
+        $this->assertEquals([
+            [
                'message' => 'test',
                'class' => $expectedClass,
-                'trace' => array(array(
+                'trace' => [[
                    'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => '', 'file' => 'foo.php', 'line' => 123,
-                    'args' => array(),
-                )),
-            ),
-        ), $flattened->toArray());
+                    'args' => [],
+                ]],
+            ],
+        ], $flattened->toArray());
    }

    public function testCreate()
@@ -229,10 +229,10 @@ class FlattenExceptionTest extends TestCase

    public function flattenDataProvider()
    {
-        return array(
-            array(new \Exception('test', 123), 'Exception'),
-            array(new \Error('test', 123), 'Error'),
-        );
+        return [
+            [new \Exception('test', 123), 'Exception'],
+            [new \Error('test', 123), 'Error'],
+        ];
    }

    public function testArguments()
@@ -242,15 +242,15 @@ class FlattenExceptionTest extends TestCase

        $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,
@@ -260,7 +260,7 @@ class FlattenExceptionTest extends TestCase
            '',
            INF,
            NAN,
-        ));
+        ]);

        $flattened = FlattenException::create($exception);
        $trace = $flattened->getTrace();
@@ -271,26 +271,26 @@ class FlattenExceptionTest extends TestCase
        fclose($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', 'stream'), $array[$i++]);
-        $this->assertSame(array('resource', 'stream'), $array[$i++]);
+        $this->assertSame(['object', 'stdClass'], $array[$i++]);
+        $this->assertSame(['object', 'Symfony\Component\HttpKernel\Exception\NotFoundHttpException'], $array[$i++]);
+        $this->assertSame(['incomplete-object', 'BogusTestClass'], $array[$i++]);
+        $this->assertSame(['resource', 'stream'], $array[$i++]);
+        $this->assertSame(['resource', 'stream'], $array[$i++]);

        $args = $array[$i++];
        $this->assertSame($args[0], 'object');
        $this->assertTrue('Closure' === $args[1] || is_subclass_of($args[1], '\Closure'), 'Expect object class name to be Closure or a subclass of Closure.');

-        $this->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');
@@ -300,7 +300,7 @@ class FlattenExceptionTest extends TestCase
    public function testRecursionInArguments()
    {
        $a = null;
-        $a = array('foo', array(2, &$a));
+        $a = ['foo', [2, &$a]];
        $exception = $this->createException($a);

        $flattened = FlattenException::create($exception);
@@ -310,7 +310,7 @@ class FlattenExceptionTest extends TestCase

    public function testTooBigArray()
    {
-        $a = array();
+        $a = [];
        for ($i = 0; $i < 20; ++$i) {
            for ($j = 0; $j < 50; ++$j) {
                for ($k = 0; $k < 10; ++$k) {
@@ -325,7 +325,7 @@ 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);

@@ -333,6 +333,19 @@ class FlattenExceptionTest extends TestCase
        $this->assertNotContains('*value1*', $serializeTrace);
    }

+    public function testAnonymousClass()
+    {
+        $flattened = FlattenException::create(new class() extends \RuntimeException {
+        });
+
+        $this->assertSame('RuntimeException@anonymous', $flattened->getClass());
+
+        $flattened = FlattenException::create(new \Exception(sprintf('Class "%s" blah.', \get_class(new class() extends \RuntimeException {
+        }))));
+
+        $this->assertSame('Class "RuntimeException@anonymous" blah.', $flattened->getMessage());
+    }
+
    private function createException($foo)
    {
        return new \Exception();
--- a/Tests/ExceptionHandlerTest.php
+++ b/Tests/ExceptionHandlerTest.php
@@ -62,10 +62,10 @@ class ExceptionHandlerTest extends TestCase

        $this->assertContains('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/bug.php?id=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->assertContains(sprintf('<span class="exception_title"><abbr title="%s">%s</abbr></span>', $expectedClass, $expectedTitle), $content);
+        $this->assertContains(sprintf('<p class="break-long-words trace-message">%s</p>', $expectedMessage), $content);
    }
 }
--- a/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
+++ b/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
@@ -61,7 +61,7 @@ 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 +71,90 @@ 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 +165,12 @@ 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']));
--- a/Tests/FatalErrorHandler/UndefinedFunctionFatalErrorHandlerTest.php
+++ b/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".',
-            ),
-        );
+            ],
+        ];
    }
 }

--- a/Tests/FatalErrorHandler/UndefinedMethodFatalErrorHandlerTest.php
+++ b/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,
-                ),
+                ],
                'Attempted to call an undefined method named "test" of class "class@anonymous".',
-            ),
-        );
+            ],
+        ];
    }
 }
--- a/Tests/Fixtures/ClassWithAnnotatedParameters.php
+++ b/Tests/Fixtures/ClassWithAnnotatedParameters.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class ClassWithAnnotatedParameters
+{
+    /**
+     * @param string $foo this is a foo parameter
+     */
+    public function fooMethod(string $foo)
+    {
+    }
+
+    /**
+     * @param string $bar parameter not implemented yet
+     */
+    public function barMethod(/* string $bar = null */)
+    {
+    }
+
+    /**
+     * @param Quz $quz parameter not implemented yet
+     */
+    public function quzMethod(/* Quz $quz = null */)
+    {
+    }
+
+    /**
+     * @param true $yes
+     */
+    public function isSymfony()
+    {
+    }
+}
--- a/Tests/Fixtures/DefinitionInEvaluatedCode.php
+++ b/Tests/Fixtures/DefinitionInEvaluatedCode.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+eval('
+    namespace Symfony\Component\Debug\Tests\Fixtures;
+
+    class DefinitionInEvaluatedCode
+    {
+    }
+');
--- a/Tests/Fixtures/ErrorHandlerThatUsesThePreviousOne.php
+++ b/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);
+    }
+}
--- a/Tests/Fixtures/FinalClass.php
+++ b/Tests/Fixtures/FinalClass.php
@@ -1,10 +0,0 @@
-<?php
-
-namespace Symfony\Component\Debug\Tests\Fixtures;
-
-/**
- * @final
- */
-class FinalClass
-{
-}
--- a/Tests/Fixtures/FinalClasses.php
+++ b/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
+}
--- a/Tests/Fixtures/FinalMethod.php
+++ b/Tests/Fixtures/FinalMethod.php
@@ -13,6 +13,8 @@ class FinalMethod

    /**
     * @final
+     *
+     * @return int
     */
    public function finalMethod2()
    {
--- a/Tests/Fixtures/InterfaceWithAnnotatedParameters.php
+++ b/Tests/Fixtures/InterfaceWithAnnotatedParameters.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+/**
+ * Ensures a deprecation is triggered when a new parameter is not declared in child classes.
+ */
+interface InterfaceWithAnnotatedParameters
+{
+    /**
+     * @param bool $matrix
+     */
+    public function whereAmI();
+}
--- a/Tests/Fixtures/LoggerThatSetAnErrorHandler.php
+++ b/Tests/Fixtures/LoggerThatSetAnErrorHandler.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+use Symfony\Component\Debug\BufferingLogger;
+
+class LoggerThatSetAnErrorHandler extends BufferingLogger
+{
+    public function log($level, $message, array $context = [])
+    {
+        set_error_handler('is_string');
+        parent::log($level, $message, $context);
+        restore_error_handler();
+    }
+}
--- a/Tests/Fixtures/SubClassWithAnnotatedParameters.php
+++ b/Tests/Fixtures/SubClassWithAnnotatedParameters.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class SubClassWithAnnotatedParameters extends ClassWithAnnotatedParameters implements InterfaceWithAnnotatedParameters
+{
+    use TraitWithAnnotatedParameters;
+
+    public function fooMethod(string $foo)
+    {
+    }
+
+    public function barMethod($bar = null)
+    {
+    }
+
+    public function quzMethod()
+    {
+    }
+
+    public function whereAmI()
+    {
+    }
+}
--- a/Tests/Fixtures/ToStringThrower.php
+++ b/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);
        }
    }
 }
--- a/Tests/Fixtures/TraitWithAnnotatedParameters.php
+++ b/Tests/Fixtures/TraitWithAnnotatedParameters.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+trait TraitWithAnnotatedParameters
+{
+    /**
+     * `@param` annotations in traits are not parsed.
+     */
+    public function isSymfony()
+    {
+    }
+}
--- a/Tests/HeaderMock.php
+++ b/Tests/HeaderMock.php
@@ -25,11 +25,11 @@ namespace Symfony\Component\Debug\Tests;

 function testHeader()
 {
-    static $headers = array();
+    static $headers = [];

    if (!$h = \func_get_args()) {
        $h = $headers;
-        $headers = array();
+        $headers = [];

        return $h;
    }
--- a/Tests/MockExceptionHandler.php
+++ b/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;
-    }
-}
--- a/Tests/phpt/exception_rethrown.phpt
+++ b/Tests/phpt/exception_rethrown.phpt
@@ -14,7 +14,7 @@ require $vendor.'/vendor/autoload.php';
 if (true) {
    class TestLogger extends \Psr\Log\AbstractLogger
    {
-        public function log($level, $message, array $context = array())
+        public function log($level, $message, array $context = [])
        {
            echo $message, "\n";
        }
--- a/Tests/phpt/fatal_with_nested_handlers.phpt
+++ b/Tests/phpt/fatal_with_nested_handlers.phpt
@@ -17,9 +17,9 @@ ini_set('display_errors', 0);
 $eHandler = set_error_handler('var_dump');
 $xHandler = set_exception_handler('var_dump');

-var_dump(array(
+var_dump([
    $eHandler[0] === $xHandler[0] ? 'Error and exception handlers do match' : 'Error and exception handlers are different',
-));
+]);

 $eHandler[0]->setExceptionHandler('print_r');

--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,7 @@
    "minimum-stability": "dev",
    "extra": {
        "branch-alias": {
-            "dev-master": "4.1-dev"
+            "dev-master": "4.2-dev"
        }
    }
 }