[2.6] fix deprecation silencing...

[2.6] cleanup deprecated uses
[Debug] fix test
2026-03-25 09:42:20 +01:00 · 2015-01-05 18:41:06 +01:00 · 2015-01-05 09:56:52 +01:00 · 2015-01-04 15:59:17 +01:00 · 2015-01-04 13:31:37 +01:00 · 2015-01-03 22:13:09 +01:00
41 changed files with 3243 additions and 402 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,26 @@
 CHANGELOG
 =========

+2.6.0
+-----
+
+* generalized ErrorHandler and ExceptionHandler,
+  with some new methods and others deprecated
+* enhanced error messages for uncaught exceptions
+
+2.5.0
+-----
+
+* added ExceptionHandler::setHandler()
+* added UndefinedMethodFatalErrorHandler
+* deprecated DummyException
+
+2.4.0
+-----
+
+ * added a DebugClassLoader able to wrap any autoloader providing a findFile method
+ * improved error messages for not found classes and functions
+
 2.3.0
 -----

--- a/Debug.php
+++ b/Debug.php
@@ -11,8 +11,6 @@

 namespace Symfony\Component\Debug;

-use Symfony\Component\ClassLoader\DebugClassLoader;
-
 /**
 * Registers all the debug tools.
 *
@@ -30,8 +28,8 @@ class Debug
     * If the Symfony ClassLoader component is available, a special
     * class loader is also registered.
     *
-     * @param int     $errorReportingLevel The level of error reporting you want
-     * @param bool    $displayErrors       Whether to display errors (for development) or just log them (for production)
+     * @param int  $errorReportingLevel The level of error reporting you want
+     * @param bool $displayErrors       Whether to display errors (for development) or just log them (for production)
     */
    public static function enable($errorReportingLevel = null, $displayErrors = true)
    {
@@ -41,18 +39,24 @@ class Debug

        static::$enabled = true;

-        error_reporting(-1);
+        if (null !== $errorReportingLevel) {
+            error_reporting($errorReportingLevel);
+        } else {
+            error_reporting(-1);
+        }

-        ErrorHandler::register($errorReportingLevel, $displayErrors);
        if ('cli' !== php_sapi_name()) {
+            ini_set('display_errors', 0);
            ExceptionHandler::register();
-        // CLI - display errors only if they're not already logged to STDERR
        } elseif ($displayErrors && (!ini_get('log_errors') || ini_get('error_log'))) {
+            // CLI - display errors only if they're not already logged to STDERR
            ini_set('display_errors', 1);
        }
-
-        if (class_exists('Symfony\Component\ClassLoader\DebugClassLoader')) {
-            DebugClassLoader::enable();
+        $handler = ErrorHandler::register();
+        if (!$displayErrors) {
+            $handler->throwAt(0, true);
        }
+
+        DebugClassLoader::enable();
    }
 }
--- a/DebugClassLoader.php
+++ b/DebugClassLoader.php
@@ -0,0 +1,223 @@
+<?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;
+
+/**
+ * Autoloader checking if the class is really defined in the file found.
+ *
+ * The ClassLoader will wrap all registered autoloaders
+ * and will throw an exception if a file is found but does
+ * not declare the class.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Christophe Coevoet <stof@notk.org>
+ * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @api
+ */
+class DebugClassLoader
+{
+    private $classLoader;
+    private $isFinder;
+    private $wasFinder;
+    private static $caseCheck;
+
+    /**
+     * Constructor.
+     *
+     * @param callable|object $classLoader
+     *
+     * @api
+     * @deprecated since 2.5, passing an object is deprecated and support for it will be removed in 3.0
+     */
+    public function __construct($classLoader)
+    {
+        $this->wasFinder = is_object($classLoader) && method_exists($classLoader, 'findFile');
+
+        if ($this->wasFinder) {
+            $this->classLoader = array($classLoader, 'loadClass');
+            $this->isFinder = true;
+        } else {
+            $this->classLoader = $classLoader;
+            $this->isFinder = is_array($classLoader) && method_exists($classLoader[0], 'findFile');
+        }
+
+        if (!isset(self::$caseCheck)) {
+            self::$caseCheck = false !== stripos(PHP_OS, 'win') ? (false !== stripos(PHP_OS, 'darwin') ? 2 : 1) : 0;
+        }
+    }
+
+    /**
+     * Gets the wrapped class loader.
+     *
+     * @return callable|object a class loader
+     *
+     * @deprecated since 2.5, returning an object is deprecated and support for it will be removed in 3.0
+     */
+    public function getClassLoader()
+    {
+        return $this->wasFinder ? $this->classLoader[0] : $this->classLoader;
+    }
+
+    /**
+     * Wraps all autoloaders
+     */
+    public static function enable()
+    {
+        // Ensures we don't hit https://bugs.php.net/42098
+        class_exists('Symfony\Component\Debug\ErrorHandler');
+        class_exists('Psr\Log\LogLevel');
+
+        if (!is_array($functions = spl_autoload_functions())) {
+            return;
+        }
+
+        foreach ($functions as $function) {
+            spl_autoload_unregister($function);
+        }
+
+        foreach ($functions as $function) {
+            if (!is_array($function) || !$function[0] instanceof self) {
+                $function = array(new static($function), 'loadClass');
+            }
+
+            spl_autoload_register($function);
+        }
+    }
+
+    /**
+     * Disables the wrapping.
+     */
+    public static function disable()
+    {
+        if (!is_array($functions = spl_autoload_functions())) {
+            return;
+        }
+
+        foreach ($functions as $function) {
+            spl_autoload_unregister($function);
+        }
+
+        foreach ($functions as $function) {
+            if (is_array($function) && $function[0] instanceof self) {
+                $function = $function[0]->getClassLoader();
+            }
+
+            spl_autoload_register($function);
+        }
+    }
+
+    /**
+     * Finds a file by class name
+     *
+     * @param string $class A class name to resolve to file
+     *
+     * @return string|null
+     *
+     * @deprecated Deprecated since 2.5, to be removed in 3.0.
+     */
+    public function findFile($class)
+    {
+        if ($this->wasFinder) {
+            return $this->classLoader[0]->findFile($class);
+        }
+    }
+
+    /**
+     * Loads the given class or interface.
+     *
+     * @param string $class The name of the class
+     *
+     * @return bool|null True, if loaded
+     *
+     * @throws \RuntimeException
+     */
+    public function loadClass($class)
+    {
+        ErrorHandler::stackErrors();
+
+        try {
+            if ($this->isFinder) {
+                if ($file = $this->classLoader[0]->findFile($class)) {
+                    require $file;
+                }
+            } else {
+                call_user_func($this->classLoader, $class);
+                $file = false;
+            }
+        } catch (\Exception $e) {
+            ErrorHandler::unstackErrors();
+
+            throw $e;
+        }
+
+        ErrorHandler::unstackErrors();
+
+        $exists = class_exists($class, false) || interface_exists($class, false) || (function_exists('trait_exists') && trait_exists($class, false));
+
+        if ('\\' === $class[0]) {
+            $class = substr($class, 1);
+        }
+
+        if ($exists) {
+            $refl = new \ReflectionClass($class);
+            $name = $refl->getName();
+
+            if ($name !== $class && 0 === strcasecmp($name, $class)) {
+                throw new \RuntimeException(sprintf('Case mismatch between loaded and declared class names: %s vs %s', $class, $name));
+            }
+        }
+
+        if ($file) {
+            if (!$exists) {
+                if (false !== strpos($class, '/')) {
+                    throw new \RuntimeException(sprintf('Trying to autoload a class with an invalid name "%s". Be careful that the namespace separator is "\" in PHP, not "/".', $class));
+                }
+
+                throw new \RuntimeException(sprintf('The autoloader expected class "%s" to be defined in file "%s". The file was found but the class was not in it, the class name or namespace probably has a typo.', $class, $file));
+            }
+            if (self::$caseCheck && preg_match('#([/\\\\][a-zA-Z_\x7F-\xFF][a-zA-Z0-9_\x7F-\xFF]*)+\.(php|hh)$#D', $file, $tail)) {
+                $tail = $tail[0];
+                $real = $refl->getFilename();
+
+                if (2 === self::$caseCheck) {
+                    // realpath() on MacOSX doesn't normalize the case of characters
+                    $cwd = getcwd();
+                    $basename = strrpos($real, '/');
+                    chdir(substr($real, 0, $basename));
+                    $basename = substr($real, $basename + 1);
+                    // glob() patterns are case-sensitive even if the underlying fs is not
+                    if (!in_array($basename, glob($basename.'*', GLOB_NOSORT), true)) {
+                        $real = getcwd().'/';
+                        $h = opendir('.');
+                        while (false !== $f = readdir($h)) {
+                            if (0 === strcasecmp($f, $basename)) {
+                                $real .= $f;
+                                break;
+                            }
+                        }
+                        closedir($h);
+                    }
+                    chdir($cwd);
+                }
+
+                if (0 === substr_compare($real, $tail, -strlen($tail), strlen($tail), true)
+                  && 0 !== substr_compare($real, $tail, -strlen($tail), strlen($tail), false)
+                ) {
+                    throw new \RuntimeException(sprintf('Case mismatch between class and source file names: %s vs %s', $class, $real));
+                }
+            }
+
+            return true;
+        }
+    }
+}
--- a/ErrorHandler.php
+++ b/ErrorHandler.php
@@ -11,196 +11,677 @@

 namespace Symfony\Component\Debug;

-use Symfony\Component\Debug\Exception\FatalErrorException;
-use Symfony\Component\Debug\Exception\ContextErrorException;
-use Symfony\Component\Debug\Exception\DummyException;
+use Psr\Log\LogLevel;
 use Psr\Log\LoggerInterface;
+use Symfony\Component\Debug\Exception\ContextErrorException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\OutOfMemoryException;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
+use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
+use Symfony\Component\Debug\FatalErrorHandler\FatalErrorHandlerInterface;

 /**
- * ErrorHandler.
+ * A generic ErrorHandler for the PHP engine.
 *
- * @author Fabien Potencier <fabien@symfony.com>
- * @author Konstantin Myakshin <koc-dp@yandex.ru>
+ * Provides five bit fields that control how errors are handled:
+ * - thrownErrors: errors thrown as \ErrorException
+ * - loggedErrors: logged errors, when not @-silenced
+ * - scopedErrors: errors thrown or logged with their local context
+ * - tracedErrors: errors logged with their stack trace, only once for repeated errors
+ * - screamedErrors: never @-silenced errors
+ *
+ * Each error level can be logged by a dedicated PSR-3 logger object.
+ * Screaming only applies to logging.
+ * Throwing takes precedence over logging.
+ * Uncaught exceptions are logged as E_ERROR.
+ * E_DEPRECATED and E_USER_DEPRECATED levels never throw.
+ * E_RECOVERABLE_ERROR and E_USER_ERROR levels always throw.
+ * Non catchable errors that can be detected at shutdown time are logged when the scream bit field allows so.
+ * As errors have a performance cost, repeated errors are all logged, so that the developer
+ * can see them and weight them as more important to fix than others of the same level.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
 */
 class ErrorHandler
 {
+    /**
+     * @deprecated since 2.6, to be removed in 3.0.
+     */
    const TYPE_DEPRECATION = -100;

    private $levels = array(
-        E_WARNING => 'Warning',
-        E_NOTICE => 'Notice',
-        E_USER_ERROR => 'User Error',
-        E_USER_WARNING => 'User Warning',
-        E_USER_NOTICE => 'User Notice',
-        E_STRICT => 'Runtime Notice',
-        E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
        E_DEPRECATED => 'Deprecated',
        E_USER_DEPRECATED => 'User Deprecated',
+        E_NOTICE => 'Notice',
+        E_USER_NOTICE => 'User Notice',
+        E_STRICT => 'Runtime Notice',
+        E_WARNING => 'Warning',
+        E_USER_WARNING => 'User Warning',
+        E_COMPILE_WARNING => 'Compile Warning',
+        E_CORE_WARNING => 'Core Warning',
+        E_USER_ERROR => 'User Error',
+        E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
+        E_COMPILE_ERROR => 'Compile Error',
+        E_PARSE => 'Parse Error',
        E_ERROR => 'Error',
        E_CORE_ERROR => 'Core Error',
-        E_COMPILE_ERROR => 'Compile Error',
-        E_PARSE => 'Parse',
    );

-    private $level;
+    private $loggers = array(
+        E_DEPRECATED => array(null, LogLevel::INFO),
+        E_USER_DEPRECATED => array(null, LogLevel::INFO),
+        E_NOTICE => array(null, LogLevel::NOTICE),
+        E_USER_NOTICE => array(null, LogLevel::NOTICE),
+        E_STRICT => array(null, LogLevel::NOTICE),
+        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::ERROR),
+        E_RECOVERABLE_ERROR => array(null, LogLevel::ERROR),
+        E_COMPILE_ERROR => array(null, LogLevel::EMERGENCY),
+        E_PARSE => array(null, LogLevel::EMERGENCY),
+        E_ERROR => array(null, LogLevel::EMERGENCY),
+        E_CORE_ERROR => array(null, LogLevel::EMERGENCY),
+    );

-    private $reservedMemory;
+    private $thrownErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
+    private $scopedErrors = 0x1FFF; // E_ALL - E_DEPRECATED - E_USER_DEPRECATED
+    private $tracedErrors = 0x77FB; // E_ALL - E_STRICT - E_PARSE
+    private $screamedErrors = 0x55; // E_ERROR + E_CORE_ERROR + E_COMPILE_ERROR + E_PARSE
+    private $loggedErrors = 0;

-    private $displayErrors;
+    private $loggedTraces = array();
+    private $isRecursive = 0;
+    private $exceptionHandler;
+
+    private static $reservedMemory;
+    private static $stackedErrors = array();
+    private static $stackedErrorLevels = array();

    /**
-     * @var LoggerInterface[] Loggers for channels
+     * Same init value as thrownErrors
+     *
+     * @deprecated since 2.6, to be removed in 3.0.
     */
-    private static $loggers = array();
+    private $displayErrors = 0x1FFF;

    /**
     * Registers the error handler.
     *
-     * @param int     $level The level at which the conversion to Exception is done (null to use the error_reporting() value and 0 to disable)
-     * @param bool    $displayErrors Display errors (for dev environment) or just log they (production usage)
+     * @param self|null|int $handler The handler to register, or @deprecated (since 2.6, to be removed in 3.0) bit field of thrown levels
+     * @param bool          $replace Whether to replace or not any existing handler
     *
-     * @return ErrorHandler The registered error handler
+     * @return self The registered error handler
     */
-    public static function register($level = null, $displayErrors = true)
+    public static function register($handler = null, $replace = true)
    {
-        $handler = new static();
-        $handler->setLevel($level);
-        $handler->setDisplayErrors($displayErrors);
+        if (null === self::$reservedMemory) {
+            self::$reservedMemory = str_repeat('x', 10240);
+            register_shutdown_function(__CLASS__.'::handleFatalError');
+        }

-        ini_set('display_errors', 0);
-        set_error_handler(array($handler, 'handle'));
-        register_shutdown_function(array($handler, 'handleFatal'));
-        $handler->reservedMemory = str_repeat('x', 10240);
+        $levels = -1;
+
+        if ($handlerIsNew = !$handler instanceof self) {
+            // @deprecated polymorphism, to be removed in 3.0
+            if (null !== $handler) {
+                $levels = $replace ? $handler : 0;
+                $replace = true;
+            }
+            $handler = new static();
+        }
+
+        $prev = set_error_handler(array($handler, 'handleError'), $handler->thrownErrors | $handler->loggedErrors);
+
+        if ($handlerIsNew && is_array($prev) && $prev[0] instanceof self) {
+            $handler = $prev[0];
+            $replace = false;
+        }
+        if ($replace || !$prev) {
+            $handler->setExceptionHandler(set_exception_handler(array($handler, 'handleException')));
+        } else {
+            restore_error_handler();
+        }
+
+        $handler->throwAt($levels & $handler->thrownErrors, true);

        return $handler;
    }

-    public function setLevel($level)
+    /**
+     * Sets a logger to non assigned errors levels.
+     *
+     * @param LoggerInterface $logger  A PSR-3 logger to put as default for the given levels
+     * @param array|int       $levels  An array map of E_* to LogLevel::* or an integer bit field of E_* constants
+     * @param bool            $replace Whether to replace or not any existing logger
+     */
+    public function setDefaultLogger(LoggerInterface $logger, $levels = null, $replace = false)
    {
-        $this->level = null === $level ? error_reporting() : $level;
-    }
+        $loggers = array();

-    public function setDisplayErrors($displayErrors)
-    {
-        $this->displayErrors = $displayErrors;
-    }
+        if (is_array($levels)) {
+            foreach ($levels as $type => $logLevel) {
+                if (empty($this->loggers[$type][0]) || $replace) {
+                    $loggers[$type] = array($logger, $logLevel);
+                }
+            }
+        } else {
+            if (null === $levels) {
+                $levels = E_ALL | E_STRICT;
+            }
+            foreach ($this->loggers as $type => $log) {
+                if (($type & $levels) && (empty($log[0]) || $replace)) {
+                    $log[0] = $logger;
+                    $loggers[$type] = $log;
+                }
+            }
+        }

-    public static function setLogger(LoggerInterface $logger, $channel = 'deprecation')
-    {
-        self::$loggers[$channel] = $logger;
+        $this->setLoggers($loggers);
    }

    /**
-     * @throws ContextErrorException When error_reporting returns error
+     * Sets a logger for each error level.
+     *
+     * @param array $loggers Error levels to [LoggerInterface|null, LogLevel::*] map
+     *
+     * @return array The previous map
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function setLoggers(array $loggers)
+    {
+        $prevLogged = $this->loggedErrors;
+        $prev = $this->loggers;
+
+        foreach ($loggers as $type => $log) {
+            if (!isset($prev[$type])) {
+                throw new \InvalidArgumentException('Unknown error type: '.$type);
+            }
+            if (!is_array($log)) {
+                $log = array($log);
+            } elseif (!array_key_exists(0, $log)) {
+                throw new \InvalidArgumentException('No logger provided');
+            }
+            if (null === $log[0]) {
+                $this->loggedErrors &= ~$type;
+            } elseif ($log[0] instanceof LoggerInterface) {
+                $this->loggedErrors |= $type;
+            } else {
+                throw new \InvalidArgumentException('Invalid logger provided');
+            }
+            $this->loggers[$type] = $log + $prev[$type];
+        }
+        $this->reRegister($prevLogged | $this->thrownErrors);
+
+        return $prev;
+    }
+
+    /**
+     * Sets a user exception handler.
+     *
+     * @param callable $handler A handler that will be called on Exception
+     *
+     * @return callable|null The previous exception handler
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function setExceptionHandler($handler)
+    {
+        if (null !== $handler && !is_callable($handler)) {
+            throw new \LogicException('The exception handler must be a valid PHP callable.');
+        }
+        $prev = $this->exceptionHandler;
+        $this->exceptionHandler = $handler;
+
+        return $prev;
+    }
+
+    /**
+     * Sets the error levels that are to be thrown.
+     *
+     * @param int  $levels  A bit field of E_* constants for thrown errors
+     * @param bool $replace Replace or amend the previous value
+     *
+     * @return int The previous value
+     */
+    public function throwAt($levels, $replace = false)
+    {
+        $prev = $this->thrownErrors;
+        $this->thrownErrors = ($levels | E_RECOVERABLE_ERROR | E_USER_ERROR) & ~E_USER_DEPRECATED & ~E_DEPRECATED;
+        if (!$replace) {
+            $this->thrownErrors |= $prev;
+        }
+        $this->reRegister($prev | $this->loggedErrors);
+
+        // $this->displayErrors is @deprecated since 2.6
+        $this->displayErrors = $this->thrownErrors;
+
+        return $prev;
+    }
+
+    /**
+     * Sets the error levels that are logged or thrown with their local scope.
+     *
+     * @param int  $levels  A bit field of E_* constants for scoped errors
+     * @param bool $replace Replace or amend the previous value
+     *
+     * @return int The previous value
+     */
+    public function scopeAt($levels, $replace = false)
+    {
+        $prev = $this->scopedErrors;
+        $this->scopedErrors = (int) $levels;
+        if (!$replace) {
+            $this->scopedErrors |= $prev;
+        }
+
+        return $prev;
+    }
+
+    /**
+     * Sets the error levels that are logged with their stack trace.
+     *
+     * @param int  $levels  A bit field of E_* constants for traced errors
+     * @param bool $replace Replace or amend the previous value
+     *
+     * @return int The previous value
+     */
+    public function traceAt($levels, $replace = false)
+    {
+        $prev = $this->tracedErrors;
+        $this->tracedErrors = (int) $levels;
+        if (!$replace) {
+            $this->tracedErrors |= $prev;
+        }
+
+        return $prev;
+    }
+
+    /**
+     * Sets the error levels where the @-operator is ignored.
+     *
+     * @param int  $levels  A bit field of E_* constants for screamed errors
+     * @param bool $replace Replace or amend the previous value
+     *
+     * @return int The previous value
+     */
+    public function screamAt($levels, $replace = false)
+    {
+        $prev = $this->screamedErrors;
+        $this->screamedErrors = (int) $levels;
+        if (!$replace) {
+            $this->screamedErrors |= $prev;
+        }
+
+        return $prev;
+    }
+
+    /**
+     * Re-registers as a PHP error handler if levels changed.
+     */
+    private function reRegister($prev)
+    {
+        if ($prev !== $this->thrownErrors | $this->loggedErrors) {
+            $handler = set_error_handler('var_dump', 0);
+            $handler = is_array($handler) ? $handler[0] : null;
+            restore_error_handler();
+            if ($handler === $this) {
+                restore_error_handler();
+                set_error_handler(array($this, 'handleError'), $this->thrownErrors | $this->loggedErrors);
+            }
+        }
+    }
+
+    /**
+     * Handles errors by filtering then logging them according to the configured bit fields.
+     *
+     * @param int    $type    One of the E_* constants
+     * @param string $file
+     * @param int    $line
+     * @param array  $context
+     *
+     * @return bool Returns false when no handling happens so that the PHP engine can handle the error itself.
+     *
+     * @throws \ErrorException When $this->thrownErrors requests so
+     *
+     * @internal
+     */
+    public function handleError($type, $message, $file, $line, array $context)
+    {
+        $level = error_reporting() | E_RECOVERABLE_ERROR | E_USER_ERROR;
+        $log = $this->loggedErrors & $type;
+        $throw = $this->thrownErrors & $type & $level;
+        $type &= $level | $this->screamedErrors;
+
+        if ($type && ($log || $throw)) {
+            if (PHP_VERSION_ID < 50400 && isset($context['GLOBALS']) && ($this->scopedErrors & $type)) {
+                $e = $context;                  // Whatever the signature of the method,
+                unset($e['GLOBALS'], $context); // $context is always a reference in 5.3
+                $context = $e;
+            }
+
+            if ($throw) {
+                if (($this->scopedErrors & $type) && class_exists('Symfony\Component\Debug\Exception\ContextErrorException')) {
+                    // Checking for class existence is a work around for https://bugs.php.net/42098
+                    $throw = new ContextErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line, $context);
+                } else {
+                    $throw = new \ErrorException($this->levels[$type].': '.$message, 0, $type, $file, $line);
+                }
+
+                if (PHP_VERSION_ID <= 50407 && (PHP_VERSION_ID >= 50400 || PHP_VERSION_ID <= 50317)) {
+                    // Exceptions thrown from error handlers are sometimes not caught by the exception
+                    // handler and shutdown handlers are bypassed before 5.4.8/5.3.18.
+                    // We temporarily re-enable display_errors to prevent any blank page related to this bug.
+
+                    $throw->errorHandlerCanary = new ErrorHandlerCanary();
+                }
+
+                throw $throw;
+            }
+
+            // For duplicated errors, log the trace only once
+            $e = md5("{$type}/{$line}/{$file}\x00{$message}", true);
+            $trace = true;
+
+            if (!($this->tracedErrors & $type) || isset($this->loggedTraces[$e])) {
+                $trace = false;
+            } else {
+                $this->loggedTraces[$e] = 1;
+            }
+
+            $e = compact('type', 'file', 'line', 'level');
+
+            if ($type & $level) {
+                if ($this->scopedErrors & $type) {
+                    $e['context'] = $context;
+                    if ($trace) {
+                        $e['stack'] = debug_backtrace(true); // Provide object
+                    }
+                } elseif ($trace) {
+                    $e['stack'] = debug_backtrace(PHP_VERSION_ID >= 50306 ? DEBUG_BACKTRACE_IGNORE_ARGS : false);
+                }
+            }
+
+            if ($this->isRecursive) {
+                $log = 0;
+            } elseif (self::$stackedErrorLevels) {
+                self::$stackedErrors[] = array($this->loggers[$type], $message, $e);
+            } else {
+                try {
+                    $this->isRecursive = true;
+                    $this->loggers[$type][0]->log($this->loggers[$type][1], $message, $e);
+                    $this->isRecursive = false;
+                } catch (\Exception $e) {
+                    $this->isRecursive = false;
+
+                    throw $e;
+                }
+            }
+        }
+
+        return $type && $log;
+    }
+
+    /**
+     * Handles an exception by logging then forwarding it to an other handler.
+     *
+     * @param \Exception $exception An exception to handle
+     * @param array      $error     An array as returned by error_get_last()
+     *
+     * @internal
+     */
+    public function handleException(\Exception $exception, array $error = null)
+    {
+        $level = error_reporting();
+        if ($this->loggedErrors & E_ERROR & ($level | $this->screamedErrors)) {
+            $e = array(
+                'type' => E_ERROR,
+                'file' => $exception->getFile(),
+                'line' => $exception->getLine(),
+                'level' => $level,
+                'stack' => $exception->getTrace(),
+            );
+            if ($exception instanceof FatalErrorException) {
+                $message = 'Fatal '.$exception->getMessage();
+            } elseif ($exception instanceof \ErrorException) {
+                $message = 'Uncaught '.$exception->getMessage();
+                if ($exception instanceof ContextErrorException) {
+                    $e['context'] = $exception->getContext();
+                }
+            } else {
+                $message = 'Uncaught Exception: '.$exception->getMessage();
+            }
+            if ($this->loggedErrors & $e['type']) {
+                $this->loggers[$e['type']][0]->log($this->loggers[$e['type']][1], $message, $e);
+            }
+        }
+        if ($exception instanceof FatalErrorException && !$exception instanceof OutOfMemoryException && $error) {
+            foreach ($this->getFatalErrorHandlers() as $handler) {
+                if ($e = $handler->handleError($error, $exception)) {
+                    $exception = $e;
+                    break;
+                }
+            }
+        }
+        if (empty($this->exceptionHandler)) {
+            throw $exception; // Give back $exception to the native handler
+        }
+        try {
+            call_user_func($this->exceptionHandler, $exception);
+        } catch (\Exception $handlerException) {
+            $this->exceptionHandler = null;
+            $this->handleException($handlerException);
+        }
+    }
+
+    /**
+     * Shutdown registered function for handling PHP fatal errors.
+     *
+     * @param array $error An array as returned by error_get_last()
+     *
+     * @internal
+     */
+    public static function handleFatalError(array $error = null)
+    {
+        self::$reservedMemory = '';
+        $handler = set_error_handler('var_dump', 0);
+        $handler = is_array($handler) ? $handler[0] : null;
+        restore_error_handler();
+        if ($handler instanceof self) {
+            if (null === $error) {
+                $error = error_get_last();
+            }
+
+            try {
+                while (self::$stackedErrorLevels) {
+                    static::unstackErrors();
+                }
+            } catch (\Exception $exception) {
+                // Handled below
+            }
+
+            if ($error && ($error['type'] & (E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR))) {
+                // Let's not throw anymore but keep logging
+                $handler->throwAt(0, true);
+
+                if (0 === strpos($error['message'], 'Allowed memory') || 0 === strpos($error['message'], 'Out of memory')) {
+                    $exception = new OutOfMemoryException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, false);
+                } else {
+                    $exception = new FatalErrorException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, true);
+                }
+            } elseif (!isset($exception)) {
+                return;
+            }
+
+            try {
+                $handler->handleException($exception, $error);
+            } catch (FatalErrorException $e) {
+                // Ignore this re-throw
+            }
+        }
+    }
+
+    /**
+     * Configures the error handler for delayed handling.
+     * Ensures also that non-catchable fatal errors are never silenced.
+     *
+     * As shown by http://bugs.php.net/42098 and http://bugs.php.net/60724
+     * PHP has a compile stage where it behaves unusually. To workaround it,
+     * we plug an error handler that only stacks errors for later.
+     *
+     * The most important feature of this is to prevent
+     * autoloading until unstackErrors() is called.
+     */
+    public static function stackErrors()
+    {
+        self::$stackedErrorLevels[] = error_reporting(error_reporting() | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
+    }
+
+    /**
+     * Unstacks stacked errors and forwards to the logger
+     */
+    public static function unstackErrors()
+    {
+        $level = array_pop(self::$stackedErrorLevels);
+
+        if (null !== $level) {
+            $e = error_reporting($level);
+            if ($e !== ($level | E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR)) {
+                // If the user changed the error level, do not overwrite it
+                error_reporting($e);
+            }
+        }
+
+        if (empty(self::$stackedErrorLevels)) {
+            $errors = self::$stackedErrors;
+            self::$stackedErrors = array();
+
+            foreach ($errors as $e) {
+                $e[0][0]->log($e[0][1], $e[1], $e[2]);
+            }
+        }
+    }
+
+    /**
+     * Gets the fatal error handlers.
+     *
+     * Override this method if you want to define more fatal error handlers.
+     *
+     * @return FatalErrorHandlerInterface[] An array of FatalErrorHandlerInterface
+     */
+    protected function getFatalErrorHandlers()
+    {
+        return array(
+            new UndefinedFunctionFatalErrorHandler(),
+            new UndefinedMethodFatalErrorHandler(),
+            new ClassNotFoundFatalErrorHandler(),
+        );
+    }
+
+    /**
+     * Sets the level at which the conversion to Exception is done.
+     *
+     * @param int|null $level The level (null to use the error_reporting() value and 0 to disable)
+     *
+     * @deprecated since 2.6, to be removed in 3.0. Use throwAt() instead.
+     */
+    public function setLevel($level)
+    {
+        $level = null === $level ? error_reporting() : $level;
+        $this->throwAt($level, true);
+    }
+
+    /**
+     * Sets the display_errors flag value.
+     *
+     * @param int $displayErrors The display_errors flag value
+     *
+     * @deprecated since 2.6, to be removed in 3.0. Use throwAt() instead.
+     */
+    public function setDisplayErrors($displayErrors)
+    {
+        if ($displayErrors) {
+            $this->throwAt($this->displayErrors, true);
+        } else {
+            $displayErrors = $this->displayErrors;
+            $this->throwAt(0, true);
+            $this->displayErrors = $displayErrors;
+        }
+    }
+
+    /**
+     * Sets a logger for the given channel.
+     *
+     * @param LoggerInterface $logger  A logger interface
+     * @param string          $channel The channel associated with the logger (deprecation, emergency or scream)
+     *
+     * @deprecated since 2.6, to be removed in 3.0. Use setLoggers() or setDefaultLogger() instead.
+     */
+    public static function setLogger(LoggerInterface $logger, $channel = 'deprecation')
+    {
+        $handler = set_error_handler('var_dump', 0);
+        $handler = is_array($handler) ? $handler[0] : null;
+        restore_error_handler();
+        if (!$handler instanceof self) {
+            return;
+        }
+        if ('deprecation' === $channel) {
+            $handler->setDefaultLogger($logger, E_DEPRECATED | E_USER_DEPRECATED, true);
+            $handler->screamAt(E_DEPRECATED | E_USER_DEPRECATED);
+        } elseif ('scream' === $channel) {
+            $handler->setDefaultLogger($logger, E_ALL | E_STRICT, false);
+            $handler->screamAt(E_ALL | E_STRICT);
+        } elseif ('emergency' === $channel) {
+            $handler->setDefaultLogger($logger, E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR, true);
+            $handler->screamAt(E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR);
+        }
+    }
+
+    /**
+     * @deprecated since 2.6, to be removed in 3.0. Use handleError() instead.
     */
    public function handle($level, $message, $file = 'unknown', $line = 0, $context = array())
    {
-        if (0 === $this->level) {
-            return false;
-        }
-
-        if ($level & (E_USER_DEPRECATED | E_DEPRECATED)) {
-            if (isset(self::$loggers['deprecation'])) {
-                if (PHP_VERSION_ID < 50400) {
-                    $stack = array_map(
-                        function ($row) {
-                            unset($row['args']);
-
-                            return $row;
-                        },
-                        array_slice(debug_backtrace(false), 0, 10)
-                    );
-                } else {
-                    $stack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 10);
-                }
-
-                self::$loggers['deprecation']->warning($message, array('type' => self::TYPE_DEPRECATION, 'stack' => $stack));
-            }
-
-            return true;
-        }
-
-        if ($this->displayErrors && error_reporting() & $level && $this->level & $level) {
-            // make sure the ContextErrorException class is loaded (https://bugs.php.net/bug.php?id=65322)
-            if (!class_exists('Symfony\Component\Debug\Exception\ContextErrorException')) {
-                require __DIR__.'/Exception/ContextErrorException.php';
-            }
-            if (!class_exists('Symfony\Component\Debug\Exception\FlattenException')) {
-                require __DIR__.'/Exception/FlattenException.php';
-            }
-
-            if (PHP_VERSION_ID < 50400 && isset($context['GLOBALS']) && is_array($context)) {
-                unset($context['GLOBALS']);
-            }
-
-            $exception = new ContextErrorException(sprintf('%s: %s in %s line %d', isset($this->levels[$level]) ? $this->levels[$level] : $level, $message, $file, $line), 0, $level, $file, $line, $context);
-
-            // Exceptions thrown from error handlers are sometimes not caught by the exception
-            // handler, so we invoke it directly (https://bugs.php.net/bug.php?id=54275)
-            $exceptionHandler = set_exception_handler(function () {});
-            restore_exception_handler();
-
-            if (is_array($exceptionHandler) && $exceptionHandler[0] instanceof ExceptionHandler) {
-                $exceptionHandler[0]->handle($exception);
-
-                if (!class_exists('Symfony\Component\Debug\Exception\DummyException')) {
-                    require __DIR__.'/Exception/DummyException.php';
-                }
-
-                // we must stop the PHP script execution, as the exception has
-                // already been dealt with, so, let's throw an exception that
-                // will be caught by a dummy exception handler
-                set_exception_handler(function (\Exception $e) use ($exceptionHandler) {
-                    if (!$e instanceof DummyException) {
-                        // happens if our dummy exception is caught by a
-                        // catch-all from user code, in which case, let's the
-                        // current handler handle this "new" exception
-                        call_user_func($exceptionHandler, $e);
-                    }
-                });
-
-                throw new DummyException();
-            }
-        }
-
-        return false;
+        return $this->handleError($level, $message, $file, $line, (array) $context);
    }

+    /**
+     * Handles PHP fatal errors.
+     *
+     * @deprecated since 2.6, to be removed in 3.0. Use handleFatalError() instead.
+     */
    public function handleFatal()
    {
-        if (null === $error = error_get_last()) {
-            return;
+        static::handleFatalError();
+    }
+}
+
+/**
+ * Private class used to work around https://bugs.php.net/54275
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @internal
+ */
+class ErrorHandlerCanary
+{
+    private static $displayErrors = null;
+
+    public function __construct()
+    {
+        if (null === self::$displayErrors) {
+            self::$displayErrors = ini_set('display_errors', 1);
        }
+    }

-        $this->reservedMemory = '';
-        $type = $error['type'];
-        if (0 === $this->level || !in_array($type, array(E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE))) {
-            return;
-        }
-
-        if (isset(self::$loggers['emergency'])) {
-            $fatal = array(
-                'type' => $type,
-                'file' => $error['file'],
-                'line' => $error['line'],
-            );
-
-            self::$loggers['emergency']->emerg($error['message'], $fatal);
-        }
-
-        if (!$this->displayErrors) {
-            return;
-        }
-
-        // get current exception handler
-        $exceptionHandler = set_exception_handler(function () {});
-        restore_exception_handler();
-
-        if (is_array($exceptionHandler) && $exceptionHandler[0] instanceof ExceptionHandler) {
-            $level = isset($this->levels[$type]) ? $this->levels[$type] : $type;
-            $message = sprintf('%s: %s in %s line %d', $level, $error['message'], $error['file'], $error['line']);
-            $exception = new FatalErrorException($message, 0, $type, $error['file'], $error['line']);
-            $exceptionHandler[0]->handle($exception);
+    public function __destruct()
+    {
+        if (null !== self::$displayErrors) {
+            ini_set('display_errors', self::$displayErrors);
+            self::$displayErrors = null;
        }
    }
 }
--- a/Exception/ClassNotFoundException.php
+++ b/Exception/ClassNotFoundException.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug\Exception;
+
+/**
+ * Class (or Trait or Interface) Not Found Exception.
+ *
+ * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ */
+class ClassNotFoundException extends FatalErrorException
+{
+    public function __construct($message, \ErrorException $previous)
+    {
+        parent::__construct(
+            $message,
+            $previous->getCode(),
+            $previous->getSeverity(),
+            $previous->getFile(),
+            $previous->getLine(),
+            $previous->getPrevious()
+        );
+        $this->setTrace($previous->getTrace());
+    }
+}
--- a/Exception/DummyException.php
+++ b/Exception/DummyException.php
@@ -12,9 +12,9 @@
 namespace Symfony\Component\Debug\Exception;

 /**
- * Used to stop execution of a PHP script after handling a fatal error.
- *
 * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated since version 2.5, to be removed in 3.0.
 */
 class DummyException extends \ErrorException
 {
--- a/Exception/FatalErrorException.php
+++ b/Exception/FatalErrorException.php
@@ -11,11 +11,76 @@

 namespace Symfony\Component\Debug\Exception;

+use Symfony\Component\HttpKernel\Exception\FatalErrorException as LegacyFatalErrorException;
+
+/**
+ * Fatal Error Exception.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class FatalErrorException extends LegacyFatalErrorException
+{
+}
+
+namespace Symfony\Component\HttpKernel\Exception;
+
 /**
 * Fatal Error Exception.
 *
 * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ *
+ * @deprecated Deprecated in 2.3, to be removed in 3.0. Use the same class from the Debug component instead.
 */
 class FatalErrorException extends \ErrorException
 {
+    public function __construct($message, $code, $severity, $filename, $lineno, $traceOffset = null, $traceArgs = true)
+    {
+        parent::__construct($message, $code, $severity, $filename, $lineno);
+
+        if (null !== $traceOffset) {
+            if (function_exists('xdebug_get_function_stack')) {
+                $trace = xdebug_get_function_stack();
+                if (0 < $traceOffset) {
+                    array_splice($trace, -$traceOffset);
+                }
+
+                foreach ($trace as &$frame) {
+                    if (!isset($frame['type'])) {
+                        //  XDebug pre 2.1.1 doesn't currently set the call type key http://bugs.xdebug.org/view.php?id=695
+                        if (isset($frame['class'])) {
+                            $frame['type'] = '::';
+                        }
+                    } elseif ('dynamic' === $frame['type']) {
+                        $frame['type'] = '->';
+                    } elseif ('static' === $frame['type']) {
+                        $frame['type'] = '::';
+                    }
+
+                    // XDebug also has a different name for the parameters array
+                    if (!$traceArgs) {
+                        unset($frame['params'], $frame['args']);
+                    } elseif (isset($frame['params']) && !isset($frame['args'])) {
+                        $frame['args'] = $frame['params'];
+                        unset($frame['params']);
+                    }
+                }
+
+                unset($frame);
+                $trace = array_reverse($trace);
+            } else {
+                $trace = array();
+            }
+
+            $this->setTrace($trace);
+        }
+    }
+
+    protected function setTrace($trace)
+    {
+        $traceReflector = new \ReflectionProperty('Exception', 'trace');
+        $traceReflector->setAccessible(true);
+        $traceReflector->setValue($this, $trace);
+    }
 }
--- a/Exception/FlattenException.php
+++ b/Exception/FlattenException.php
@@ -11,6 +11,7 @@

 namespace Symfony\Component\Debug\Exception;

+use Symfony\Component\HttpKernel\Exception\FlattenException as LegacyFlattenException;
 use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;

 /**
@@ -20,7 +21,7 @@ use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
-class FlattenException
+class FlattenException extends LegacyFlattenException
 {
    private $message;
    private $code;
@@ -172,36 +173,7 @@ class FlattenException

    public function setTraceFromException(\Exception $exception)
    {
-        $trace = $exception->getTrace();
-
-        if ($exception instanceof FatalErrorException) {
-            if (function_exists('xdebug_get_function_stack')) {
-                $trace = array_slice(array_reverse(xdebug_get_function_stack()), 4);
-
-                foreach ($trace as $i => $frame) {
-                    //  XDebug pre 2.1.1 doesn't currently set the call type key http://bugs.xdebug.org/view.php?id=695
-                    if (!isset($frame['type'])) {
-                        $trace[$i]['type'] = '??';
-                    }
-
-                    if ('dynamic' === $trace[$i]['type']) {
-                        $trace[$i]['type'] = '->';
-                    } elseif ('static' === $trace[$i]['type']) {
-                        $trace[$i]['type'] = '::';
-                    }
-
-                    // XDebug also has a different name for the parameters array
-                    if (isset($frame['params']) && !isset($frame['args'])) {
-                        $trace[$i]['args'] = $frame['params'];
-                        unset($trace[$i]['params']);
-                    }
-                }
-            } else {
-                $trace = array_slice(array_reverse($trace), 1);
-            }
-        }
-
-        $this->setTrace($trace, $exception->getFile(), $exception->getLine());
+        $this->setTrace($exception->getTrace(), $exception->getFile(), $exception->getLine());
    }

    public function setTrace($trace, $file, $line)
@@ -239,17 +211,20 @@ class FlattenException
        }
    }

-    private function flattenArgs($args, $level = 0)
+    private function flattenArgs($args, $level = 0, &$count = 0)
    {
        $result = array();
        foreach ($args as $key => $value) {
+            if (++$count > 1e4) {
+                return array('array', '*SKIPPED over 10000 entries*');
+            }
            if (is_object($value)) {
                $result[$key] = array('object', get_class($value));
            } elseif (is_array($value)) {
                if ($level > 10) {
                    $result[$key] = array('array', '*DEEP NESTED ARRAY*');
                } else {
-                    $result[$key] = array('array', $this->flattenArgs($value, $level + 1));
+                    $result[$key] = array('array', $this->flattenArgs($value, $level + 1, $count));
                }
            } elseif (null === $value) {
                $result[$key] = array('null', null);
@@ -275,3 +250,35 @@ class FlattenException
        return $array['__PHP_Incomplete_Class_Name'];
    }
 }
+
+namespace Symfony\Component\HttpKernel\Exception;
+
+use Symfony\Component\Debug\Exception\FlattenException as DebugFlattenException;
+
+/**
+ * FlattenException wraps a PHP Exception to be able to serialize it.
+ *
+ * Basically, this class removes all objects from the trace.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @deprecated Deprecated in 2.3, to be removed in 3.0. Use the same class from the Debug component instead.
+ */
+class FlattenException
+{
+    private $handler;
+
+    public static function __callStatic($method, $args)
+    {
+        return forward_static_call_array(array('Symfony\Component\Debug\Exception\FlattenException', $method), $args);
+    }
+
+    public function __call($method, $args)
+    {
+        if (!isset($this->handler)) {
+            $this->handler = new DebugFlattenException();
+        }
+
+        return call_user_func_array(array($this->handler, $method), $args);
+    }
+}
--- a/Exception/OutOfMemoryException.php
+++ b/Exception/OutOfMemoryException.php
@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug\Exception;
+
+/**
+ * Out of memory exception.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class OutOfMemoryException extends FatalErrorException
+{
+}
--- a/Exception/UndefinedFunctionException.php
+++ b/Exception/UndefinedFunctionException.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug\Exception;
+
+/**
+ * Undefined Function Exception.
+ *
+ * @author Konstanton Myakshin <koc-dp@yandex.ru>
+ */
+class UndefinedFunctionException extends FatalErrorException
+{
+    public function __construct($message, \ErrorException $previous)
+    {
+        parent::__construct(
+            $message,
+            $previous->getCode(),
+            $previous->getSeverity(),
+            $previous->getFile(),
+            $previous->getLine(),
+            $previous->getPrevious()
+        );
+        $this->setTrace($previous->getTrace());
+    }
+}
--- a/Exception/UndefinedMethodException.php
+++ b/Exception/UndefinedMethodException.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug\Exception;
+
+/**
+ * Undefined Method Exception.
+ *
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+class UndefinedMethodException extends FatalErrorException
+{
+    public function __construct($message, \ErrorException $previous)
+    {
+        parent::__construct(
+            $message,
+            $previous->getCode(),
+            $previous->getSeverity(),
+            $previous->getFile(),
+            $previous->getLine(),
+            $previous->getPrevious()
+        );
+        $this->setTrace($previous->getTrace());
+    }
+}
--- a/ExceptionHandler.php
+++ b/ExceptionHandler.php
@@ -13,6 +13,7 @@ namespace Symfony\Component\Debug;

 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Debug\Exception\FlattenException;
+use Symfony\Component\Debug\Exception\OutOfMemoryException;

 /**
 * ExceptionHandler converts an exception to a Response object.
@@ -24,34 +25,116 @@ use Symfony\Component\Debug\Exception\FlattenException;
 * available, the Response content is always HTML.
 *
 * @author Fabien Potencier <fabien@symfony.com>
+ * @author Nicolas Grekas <p@tchwork.com>
 */
 class ExceptionHandler
 {
    private $debug;
-    private $charset;
+    private $handler;
+    private $caughtBuffer;
+    private $caughtLength;
+    private $fileLinkFormat;

-    public function __construct($debug = true, $charset = 'UTF-8')
+    public function __construct($debug = true, $fileLinkFormat = null)
    {
        $this->debug = $debug;
-        $this->charset = $charset;
+        $this->fileLinkFormat = $fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
    }

    /**
     * Registers the exception handler.
     *
-     * @param bool    $debug
+     * @param bool $debug
     *
     * @return ExceptionHandler The registered exception handler
     */
-    public static function register($debug = true)
+    public static function register($debug = true, $fileLinkFormat = null)
    {
-        $handler = new static($debug);
+        $handler = new static($debug, $fileLinkFormat = null);

-        set_exception_handler(array($handler, 'handle'));
+        $prev = set_exception_handler(array($handler, 'handle'));
+        if (is_array($prev) && $prev[0] instanceof ErrorHandler) {
+            restore_exception_handler();
+            $prev[0]->setExceptionHandler(array($handler, 'handle'));
+        }

        return $handler;
    }

+    /**
+     * Sets a user exception handler.
+     *
+     * @param callable $handler An handler that will be called on Exception
+     *
+     * @return callable|null The previous exception handler if any
+     */
+    public function setHandler($handler)
+    {
+        if (null !== $handler && !is_callable($handler)) {
+            throw new \LogicException('The exception handler must be a valid PHP callable.');
+        }
+        $old = $this->handler;
+        $this->handler = $handler;
+
+        return $old;
+    }
+
+    /**
+     * Sets the format for links to source files.
+     *
+     * @param string $format The format for links to source files
+     *
+     * @return string The previous file link format.
+     */
+    public function setFileLinkFormat($format)
+    {
+        $old = $this->fileLinkFormat;
+        $this->fileLinkFormat = $format;
+
+        return $old;
+    }
+
+    /**
+     * Sends a response for the given Exception.
+     *
+     * To be as fail-safe as possible, the exception is first handled
+     * by our simple exception handler, then by the user exception handler.
+     * The latter takes precedence and any output from the former is cancelled,
+     * if and only if nothing bad happens in this handling path.
+     */
+    public function handle(\Exception $exception)
+    {
+        if (null === $this->handler || $exception instanceof OutOfMemoryException) {
+            $this->failSafeHandle($exception);
+
+            return;
+        }
+
+        $caughtLength = $this->caughtLength = 0;
+
+        ob_start(array($this, 'catchOutput'));
+        $this->failSafeHandle($exception);
+        while (null === $this->caughtBuffer && ob_end_flush()) {
+            // Empty loop, everything is in the condition
+        }
+        if (isset($this->caughtBuffer[0])) {
+            ob_start(array($this, 'cleanOutput'));
+            echo $this->caughtBuffer;
+            $caughtLength = ob_get_length();
+        }
+        $this->caughtBuffer = null;
+
+        try {
+            call_user_func($this->handler, $exception);
+            $this->caughtLength = $caughtLength;
+        } catch (\Exception $e) {
+            if (!$caughtLength) {
+                // All handlers failed. Let PHP handle that now.
+                throw $exception;
+            }
+        }
+    }
+
    /**
     * Sends a response for the given Exception.
     *
@@ -61,13 +144,15 @@ class ExceptionHandler
     *
     * @param \Exception $exception An \Exception instance
     *
-     * @see sendPhpResponse
-     * @see createResponse
+     * @see sendPhpResponse()
+     * @see createResponse()
     */
-    public function handle(\Exception $exception)
+    private function failSafeHandle(\Exception $exception)
    {
-        if (class_exists('Symfony\Component\HttpFoundation\Response')) {
-            $this->createResponse($exception)->send();
+        if (class_exists('Symfony\Component\HttpFoundation\Response', false)) {
+            $response = $this->createResponse($exception);
+            $response->sendHeaders();
+            $response->sendContent();
        } else {
            $this->sendPhpResponse($exception);
        }
@@ -137,29 +222,26 @@ class ExceptionHandler
                $total = $count + 1;
                foreach ($exception->toArray() as $position => $e) {
                    $ind = $count - $position + 1;
-                    $class = $this->abbrClass($e['class']);
-                    $message = nl2br($e['message']);
+                    $class = $this->formatClass($e['class']);
+                    $message = nl2br(self::utf8Htmlize($e['message']));
                    $content .= sprintf(<<<EOF
-                        <div class="block_exception clear_fix">
-                            <h2><span>%d/%d</span> %s: %s</h2>
-                        </div>
+                        <h2 class="block_exception clear_fix">
+                            <span class="exception_counter">%d/%d</span>
+                            <span class="exception_title">%s%s:</span>
+                            <span class="exception_message">%s</span>
+                        </h2>
                        <div class="block">
                            <ol class="traces list_exception">

 EOF
-                        , $ind, $total, $class, $message);
+                        , $ind, $total, $class, $this->formatPath($e['trace'][0]['file'], $e['trace'][0]['line']), $message);
                    foreach ($e['trace'] as $trace) {
                        $content .= '       <li>';
                        if ($trace['function']) {
-                            $content .= sprintf('at %s%s%s(%s)', $this->abbrClass($trace['class']), $trace['type'], $trace['function'], $this->formatArgs($trace['args']));
+                            $content .= sprintf('at %s%s%s(%s)', $this->formatClass($trace['class']), $trace['type'], $trace['function'], $this->formatArgs($trace['args']));
                        }
                        if (isset($trace['file']) && isset($trace['line'])) {
-                            if ($linkFormat = ini_get('xdebug.file_link_format')) {
-                                $link = str_replace(array('%f', '%l'), array($trace['file'], $trace['line']), $linkFormat);
-                                $content .= sprintf(' in <a href="%s" title="Go to source">%s line %s</a>', $link, $trace['file'], $trace['line']);
-                            } else {
-                                $content .= sprintf(' in %s line %s', $trace['file'], $trace['line']);
-                            }
+                            $content .= $this->formatPath($trace['file'], $trace['line']);
                        }
                        $content .= "</li>\n";
                    }
@@ -169,7 +251,7 @@ EOF
            } catch (\Exception $e) {
                // something nasty happened and we cannot throw an exception anymore
                if ($this->debug) {
-                    $title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($exception), $exception->getMessage());
+                    $title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($e), $e->getMessage());
                } else {
                    $title = 'Whoops, looks like something went wrong.';
                }
@@ -204,12 +286,14 @@ EOF;
            .sf-reset abbr { border-bottom: 1px dotted #000; cursor: help; }
            .sf-reset p { font-size:14px; line-height:20px; color:#868686; padding-bottom:20px }
            .sf-reset strong { font-weight:bold; }
-            .sf-reset a { color:#6c6159; }
+            .sf-reset a { color:#6c6159; cursor: default; }
            .sf-reset a img { border:none; }
            .sf-reset a:hover { text-decoration:underline; }
            .sf-reset em { font-style:italic; }
            .sf-reset h1, .sf-reset h2 { font: 20px Georgia, "Times New Roman", Times, serif }
-            .sf-reset h2 span { background-color: #fff; color: #333; padding: 6px; float: left; margin-right: 10px; }
+            .sf-reset .exception_counter { background-color: #fff; color: #333; padding: 6px; float: left; margin-right: 10px; float: left; display: block; }
+            .sf-reset .exception_title { margin-left: 3em; margin-bottom: 0.7em; display: block; }
+            .sf-reset .exception_message { margin-left: 3em; display: block; }
            .sf-reset .traces li { font-size:12px; padding: 2px 4px; list-style-type:decimal; margin-left:20px; }
            .sf-reset .block { background-color:#FFFFFF; padding:10px 28px; margin-bottom:20px;
                -webkit-border-bottom-right-radius: 16px;
@@ -235,8 +319,8 @@ EOF;
                overflow: hidden;
                word-wrap: break-word;
            }
-            .sf-reset li a { background:none; color:#868686; text-decoration:none; }
-            .sf-reset li a:hover { background:none; color:#313131; text-decoration:underline; }
+            .sf-reset a { background:none; color:#868686; text-decoration:none; }
+            .sf-reset a:hover { background:none; color:#313131; text-decoration:underline; }
            .sf-reset ol { padding: 10px 0; }
            .sf-reset h1 { background-color:#FFFFFF; padding: 15px 28px; margin-bottom: 20px;
                -webkit-border-radius: 10px;
@@ -272,13 +356,27 @@ EOF;
 EOF;
    }

-    private function abbrClass($class)
+    private function formatClass($class)
    {
        $parts = explode('\\', $class);

        return sprintf("<abbr title=\"%s\">%s</abbr>", $class, array_pop($parts));
    }

+    private function formatPath($path, $line)
+    {
+        $path = self::utf8Htmlize($path);
+        $file = preg_match('#[^/\\\\]*$#', $path, $file) ? $file[0] : $path;
+
+        if ($linkFormat = $this->fileLinkFormat) {
+            $link = str_replace(array('%f', '%l'), array($path, $line), $linkFormat);
+
+            return sprintf(' in <a href="%s" title="Go to source">%s line %d</a>', $link, $file, $line);
+        }
+
+        return sprintf(' in <a title="%s line %3$d" ondblclick="var f=this.innerHTML;this.innerHTML=this.title;this.title=f;">%s line %d</a>', $path, $file, $line);
+    }
+
    /**
     * Formats an array as a string.
     *
@@ -288,19 +386,14 @@ EOF;
     */
    private function formatArgs(array $args)
    {
-        if (PHP_VERSION_ID >= 50400) {
-            $flags = ENT_QUOTES | ENT_SUBSTITUTE;
-        } else {
-            $flags = ENT_QUOTES;
-        }
        $result = array();
        foreach ($args as $key => $item) {
            if ('object' === $item[0]) {
-                $formattedValue = sprintf("<em>object</em>(%s)", $this->abbrClass($item[1]));
+                $formattedValue = sprintf("<em>object</em>(%s)", $this->formatClass($item[1]));
            } elseif ('array' === $item[0]) {
                $formattedValue = sprintf("<em>array</em>(%s)", is_array($item[1]) ? $this->formatArgs($item[1]) : $item[1]);
            } elseif ('string' === $item[0]) {
-                $formattedValue = sprintf("'%s'", htmlspecialchars($item[1], $flags, $this->charset));
+                $formattedValue = sprintf("'%s'", self::utf8Htmlize($item[1]));
            } elseif ('null' === $item[0]) {
                $formattedValue = '<em>null</em>';
            } elseif ('boolean' === $item[0]) {
@@ -308,7 +401,7 @@ EOF;
            } elseif ('resource' === $item[0]) {
                $formattedValue = '<em>resource</em>';
            } else {
-                $formattedValue = str_replace("\n", '', var_export(htmlspecialchars((string) $item[1], $flags, $this->charset), true));
+                $formattedValue = str_replace("\n", '', var_export(self::utf8Htmlize((string) $item[1]), true));
            }

            $result[] = is_int($key) ? $formattedValue : sprintf("'%s' => %s", $key, $formattedValue);
@@ -316,4 +409,49 @@ EOF;

        return implode(', ', $result);
    }
+
+    /**
+     * Returns an UTF-8 and HTML encoded string
+     */
+    protected static function utf8Htmlize($str)
+    {
+        if (!preg_match('//u', $str) && function_exists('iconv')) {
+            set_error_handler('var_dump', 0);
+            $charset = ini_get('default_charset');
+            if ('UTF-8' === $charset || $str !== @iconv($charset, $charset, $str)) {
+                $charset = 'CP1252';
+            }
+            restore_error_handler();
+
+            $str = iconv($charset, 'UTF-8', $str);
+        }
+
+        return htmlspecialchars($str, ENT_QUOTES | (PHP_VERSION_ID >= 50400 ? ENT_SUBSTITUTE : 0), 'UTF-8');
+    }
+
+    /**
+     * @internal
+     */
+    public function catchOutput($buffer)
+    {
+        $this->caughtBuffer = $buffer;
+
+        return '';
+    }
+
+    /**
+     * @internal
+     */
+    public function cleanOutput($buffer)
+    {
+        if ($this->caughtLength) {
+            // use substr_replace() instead of substr() for mbstring overloading resistance
+            $cleanBuffer = substr_replace($buffer, '', 0, $this->caughtLength);
+            if (isset($cleanBuffer[0])) {
+                $buffer = $cleanBuffer;
+            }
+        }
+
+        return $buffer;
+    }
 }
--- a/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
+++ b/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php
@@ -0,0 +1,197 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\ClassNotFoundException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\DebugClassLoader;
+use Composer\Autoload\ClassLoader as ComposerClassLoader;
+use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
+use Symfony\Component\ClassLoader\UniversalClassLoader as SymfonyUniversalClassLoader;
+
+/**
+ * ErrorHandler for classes that do not exist.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function handleError(array $error, FatalErrorException $exception)
+    {
+        $messageLen = strlen($error['message']);
+        $notFoundSuffix = '\' not found';
+        $notFoundSuffixLen = strlen($notFoundSuffix);
+        if ($notFoundSuffixLen > $messageLen) {
+            return;
+        }
+
+        if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
+            return;
+        }
+
+        foreach (array('class', 'interface', 'trait') as $typeName) {
+            $prefix = ucfirst($typeName).' \'';
+            $prefixLen = strlen($prefix);
+            if (0 !== strpos($error['message'], $prefix)) {
+                continue;
+            }
+
+            $fullyQualifiedClassName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
+            if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedClassName, '\\')) {
+                $className = substr($fullyQualifiedClassName, $namespaceSeparatorIndex + 1);
+                $namespacePrefix = substr($fullyQualifiedClassName, 0, $namespaceSeparatorIndex);
+                $message = sprintf('Attempted to load %s "%s" from namespace "%s".', $typeName, $className, $namespacePrefix);
+                $tail = ' for another namespace?';
+            } else {
+                $className = $fullyQualifiedClassName;
+                $message = sprintf('Attempted to load %s "%s" from the global namespace.', $typeName, $className);
+                $tail = '?';
+            }
+
+            if ($candidates = $this->getClassCandidates($className)) {
+                $tail = array_pop($candidates).'"?';
+                if ($candidates) {
+                    $tail = ' for e.g. "'.implode('", "', $candidates).'" or "'.$tail;
+                } else {
+                    $tail = ' for "'.$tail;
+                }
+            }
+            $message .= "\nDid you forget a \"use\" statement".$tail;
+
+            return new ClassNotFoundException($message, $exception);
+        }
+    }
+
+    /**
+     * Tries to guess the full namespace for a given class name.
+     *
+     * By default, it looks for PSR-0 classes registered via a Symfony or a Composer
+     * autoloader (that should cover all common cases).
+     *
+     * @param string $class A class name (without its namespace)
+     *
+     * @return array An array of possible fully qualified class names
+     */
+    private function getClassCandidates($class)
+    {
+        if (!is_array($functions = spl_autoload_functions())) {
+            return array();
+        }
+
+        // find Symfony and Composer autoloaders
+        $classes = array();
+
+        foreach ($functions as $function) {
+            if (!is_array($function)) {
+                continue;
+            }
+            // get class loaders wrapped by DebugClassLoader
+            if ($function[0] instanceof DebugClassLoader) {
+                $function = $function[0]->getClassLoader();
+
+                // Since 2.5, returning an object from DebugClassLoader::getClassLoader() is @deprecated
+                if (is_object($function)) {
+                    $function = array($function);
+                }
+
+                if (!is_array($function)) {
+                    continue;
+                }
+            }
+
+            if ($function[0] instanceof ComposerClassLoader || $function[0] instanceof SymfonyClassLoader || $function[0] instanceof SymfonyUniversalClassLoader) {
+                foreach ($function[0]->getPrefixes() as $prefix => $paths) {
+                    foreach ($paths as $path) {
+                        $classes = array_merge($classes, $this->findClassInPath($path, $class, $prefix));
+                    }
+                }
+            }
+        }
+
+        return array_unique($classes);
+    }
+
+    /**
+     * @param string $path
+     * @param string $class
+     * @param string $prefix
+     *
+     * @return array
+     */
+    private function findClassInPath($path, $class, $prefix)
+    {
+        if (!$path = realpath($path)) {
+            return array();
+        }
+
+        $classes = array();
+        $filename = $class.'.php';
+        foreach (new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($path), \RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
+            if ($filename == $file->getFileName() && $class = $this->convertFileToClass($path, $file->getPathName(), $prefix)) {
+                $classes[] = $class;
+            }
+        }
+
+        return $classes;
+    }
+
+    /**
+     * @param string $path
+     * @param string $file
+     * @param string $prefix
+     *
+     * @return string|null
+     */
+    private function convertFileToClass($path, $file, $prefix)
+    {
+        $candidates = array(
+            // namespaced class
+            $namespacedClass = str_replace(array($path.DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            // namespaced class (with target dir)
+            $namespacedClassTargetDir = $prefix.str_replace(array($path.DIRECTORY_SEPARATOR, '.php', '/'), array('', '', '\\'), $file),
+            // PEAR class
+            str_replace('\\', '_', $namespacedClass),
+            // PEAR class (with target dir)
+            str_replace('\\', '_', $namespacedClassTargetDir),
+        );
+
+        // We cannot use the autoloader here as most of them use require; but if the class
+        // is not found, the new autoloader call will require the file again leading to a
+        // "cannot redeclare class" error.
+        foreach ($candidates as $candidate) {
+            if ($this->classExists($candidate)) {
+                return $candidate;
+            }
+        }
+
+        require_once $file;
+
+        foreach ($candidates as $candidate) {
+            if ($this->classExists($candidate)) {
+                return $candidate;
+            }
+        }
+    }
+
+    /**
+     * @param string $class
+     *
+     * @return bool
+     */
+    private function classExists($class)
+    {
+        return class_exists($class, false) || interface_exists($class, false) || (function_exists('trait_exists') && trait_exists($class, false));
+    }
+}
--- a/FatalErrorHandler/FatalErrorHandlerInterface.php
+++ b/FatalErrorHandler/FatalErrorHandlerInterface.php
@@ -0,0 +1,32 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\FatalErrorException;
+
+/**
+ * Attempts to convert fatal errors to exceptions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface FatalErrorHandlerInterface
+{
+    /**
+     * Attempts to convert an error into an exception.
+     *
+     * @param array               $error     An array as returned by error_get_last()
+     * @param FatalErrorException $exception A FatalErrorException instance
+     *
+     * @return FatalErrorException|null A FatalErrorException instance if the class is able to convert the error, null otherwise
+     */
+    public function handleError(array $error, FatalErrorException $exception);
+}
--- a/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
+++ b/FatalErrorHandler/UndefinedFunctionFatalErrorHandler.php
@@ -0,0 +1,84 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\UndefinedFunctionException;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+
+/**
+ * ErrorHandler for undefined functions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function handleError(array $error, FatalErrorException $exception)
+    {
+        $messageLen = strlen($error['message']);
+        $notFoundSuffix = '()';
+        $notFoundSuffixLen = strlen($notFoundSuffix);
+        if ($notFoundSuffixLen > $messageLen) {
+            return;
+        }
+
+        if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
+            return;
+        }
+
+        $prefix = 'Call to undefined function ';
+        $prefixLen = strlen($prefix);
+        if (0 !== strpos($error['message'], $prefix)) {
+            return;
+        }
+
+        $fullyQualifiedFunctionName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
+        if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedFunctionName, '\\')) {
+            $functionName = substr($fullyQualifiedFunctionName, $namespaceSeparatorIndex + 1);
+            $namespacePrefix = substr($fullyQualifiedFunctionName, 0, $namespaceSeparatorIndex);
+            $message = sprintf('Attempted to call function "%s" from namespace "%s".', $functionName, $namespacePrefix);
+        } else {
+            $functionName = $fullyQualifiedFunctionName;
+            $message = sprintf('Attempted to call function "%s" from the global namespace.', $functionName);
+        }
+
+        $candidates = array();
+        foreach (get_defined_functions() as $type => $definedFunctionNames) {
+            foreach ($definedFunctionNames as $definedFunctionName) {
+                if (false !== $namespaceSeparatorIndex = strrpos($definedFunctionName, '\\')) {
+                    $definedFunctionNameBasename = substr($definedFunctionName, $namespaceSeparatorIndex + 1);
+                } else {
+                    $definedFunctionNameBasename = $definedFunctionName;
+                }
+
+                if ($definedFunctionNameBasename === $functionName) {
+                    $candidates[] = '\\'.$definedFunctionName;
+                }
+            }
+        }
+
+        if ($candidates) {
+            sort($candidates);
+            $last = array_pop($candidates).'"?';
+            if ($candidates) {
+                $candidates = 'e.g. "'.implode('", "', $candidates).'" or "'.$last;
+            } else {
+                $candidates = '"'.$last;
+            }
+            $message .= "\nDid you mean to call ".$candidates;
+        }
+
+        return new UndefinedFunctionException($message, $exception);
+    }
+}
--- a/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
+++ b/FatalErrorHandler/UndefinedMethodFatalErrorHandler.php
@@ -0,0 +1,60 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\Exception\UndefinedMethodException;
+
+/**
+ * ErrorHandler for undefined methods.
+ *
+ * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ */
+class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function handleError(array $error, FatalErrorException $exception)
+    {
+        preg_match('/^Call to undefined method (.*)::(.*)\(\)$/', $error['message'], $matches);
+        if (!$matches) {
+            return;
+        }
+
+        $className = $matches[1];
+        $methodName = $matches[2];
+
+        $message = sprintf('Attempted to call method "%s" on class "%s".', $methodName, $className);
+
+        $candidates = array();
+        foreach (get_class_methods($className) as $definedMethodName) {
+            $lev = levenshtein($methodName, $definedMethodName);
+            if ($lev <= strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
+                $candidates[] = $definedMethodName;
+            }
+        }
+
+        if ($candidates) {
+            sort($candidates);
+            $last = array_pop($candidates).'"?';
+            if ($candidates) {
+                $candidates = 'e.g. "'.implode('", "', $candidates).'" or "'.$last;
+            } else {
+                $candidates = '"'.$last;
+            }
+            $message .= "\nDid you mean to call ".$candidates;
+        }
+
+        return new UndefinedMethodException($message, $exception);
+    }
+}
--- a/2
+++ b/2
@@ -1,4 +1,4 @@
-Copyright (c) 2004-2014 Fabien Potencier
+Copyright (c) 2004-2015 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/README.md
+++ b/README.md
@@ -18,14 +18,13 @@ You can also use the tools individually:
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\ExceptionHandler;

-error_reporting(-1);
-
-ErrorHandler::register($errorReportingLevel);
 if ('cli' !== php_sapi_name()) {
+    ini_set('display_errors', 0);
    ExceptionHandler::register();
 } elseif (!ini_get('log_errors') || ini_get('error_log')) {
    ini_set('display_errors', 1);
 }
+ErrorHandler::register();
 ```

 Note that the `Debug::enable()` call also registers the debug class loader
--- a/Resources/ext/README.rst
+++ b/Resources/ext/README.rst
@@ -0,0 +1,72 @@
+Symfony Debug Extension
+=======================
+
+This extension adds a ``symfony_zval_info($key, $array, $options = 0)`` function that:
+
+- exposes zval_hash/refcounts, allowing e.g. efficient exploration of arbitrary structures in PHP,
+- does work with references, preventing memory copying.
+
+Its behavior is about the same as:
+
+.. code-block:: php
+
+    <?php
+
+    function symfony_zval_info($key, $array, $options = 0)
+    {
+        // $options is currently not used, but could be in future version.
+
+        if (!array_key_exists($key, $array)) {
+            return null;
+        }
+
+        $info = array(
+            'type' => gettype($array[$key]),
+            'zval_hash' => /* hashed memory address of $array[$key] */,
+            'zval_refcount' => /* internal zval refcount of $array[$key] */,
+            'zval_isref' => /* is_ref status of $array[$key] */,
+        );
+
+        switch ($info['type']) {
+            case 'object':
+                $info += array(
+                    'object_class' => get_class($array[$key]),
+                    'object_refcount' => /* internal object refcount of $array[$key] */,
+                    'object_hash' => spl_object_hash($array[$key]),
+                    'object_handle' => /* internal object handle $array[$key] */,
+                );
+                break;
+
+            case 'resource':
+                $info += array(
+                    'resource_handle' => (int) $array[$key],
+                    'resource_type' => get_resource_type($array[$key]),
+                    'resource_refcount' => /* internal resource refcount of $array[$key] */,
+                );
+                break;
+
+            case 'array':
+                $info += array(
+                    'array_count' => count($array[$key]),
+                );
+                break;
+
+            case 'string':
+                $info += array(
+                    'strlen' => strlen($array[$key]),
+                );
+                break;
+        }
+
+        return $info;
+    }
+
+To enable the extension from source, run:
+
+.. code-block:: sh
+
+    phpize
+    ./configure
+    make
+    sudo make install
+
--- a/Resources/ext/config.m4
+++ b/Resources/ext/config.m4
@@ -0,0 +1,63 @@
+dnl $Id$
+dnl config.m4 for extension symfony_debug
+
+dnl Comments in this file start with the string 'dnl'.
+dnl Remove where necessary. This file will not work
+dnl without editing.
+
+dnl If your extension references something external, use with:
+
+dnl PHP_ARG_WITH(symfony_debug, for symfony_debug support,
+dnl Make sure that the comment is aligned:
+dnl [  --with-symfony_debug             Include symfony_debug support])
+
+dnl Otherwise use enable:
+
+PHP_ARG_ENABLE(symfony_debug, whether to enable symfony_debug support,
+dnl Make sure that the comment is aligned:
+[  --enable-symfony_debug           Enable symfony_debug support])
+
+if test "$PHP_SYMFONY_DEBUG" != "no"; then
+  dnl Write more examples of tests here...
+
+  dnl # --with-symfony_debug -> check with-path
+  dnl SEARCH_PATH="/usr/local /usr"     # you might want to change this
+  dnl SEARCH_FOR="/include/symfony_debug.h"  # you most likely want to change this
+  dnl if test -r $PHP_SYMFONY_DEBUG/$SEARCH_FOR; then # path given as parameter
+  dnl   SYMFONY_DEBUG_DIR=$PHP_SYMFONY_DEBUG
+  dnl else # search default path list
+  dnl   AC_MSG_CHECKING([for symfony_debug files in default path])
+  dnl   for i in $SEARCH_PATH ; do
+  dnl     if test -r $i/$SEARCH_FOR; then
+  dnl       SYMFONY_DEBUG_DIR=$i
+  dnl       AC_MSG_RESULT(found in $i)
+  dnl     fi
+  dnl   done
+  dnl fi
+  dnl
+  dnl if test -z "$SYMFONY_DEBUG_DIR"; then
+  dnl   AC_MSG_RESULT([not found])
+  dnl   AC_MSG_ERROR([Please reinstall the symfony_debug distribution])
+  dnl fi
+
+  dnl # --with-symfony_debug -> add include path
+  dnl PHP_ADD_INCLUDE($SYMFONY_DEBUG_DIR/include)
+
+  dnl # --with-symfony_debug -> check for lib and symbol presence
+  dnl LIBNAME=symfony_debug # you may want to change this
+  dnl LIBSYMBOL=symfony_debug # you most likely want to change this 
+
+  dnl PHP_CHECK_LIBRARY($LIBNAME,$LIBSYMBOL,
+  dnl [
+  dnl   PHP_ADD_LIBRARY_WITH_PATH($LIBNAME, $SYMFONY_DEBUG_DIR/lib, SYMFONY_DEBUG_SHARED_LIBADD)
+  dnl   AC_DEFINE(HAVE_SYMFONY_DEBUGLIB,1,[ ])
+  dnl ],[
+  dnl   AC_MSG_ERROR([wrong symfony_debug lib version or lib not found])
+  dnl ],[
+  dnl   -L$SYMFONY_DEBUG_DIR/lib -lm
+  dnl ])
+  dnl
+  dnl PHP_SUBST(SYMFONY_DEBUG_SHARED_LIBADD)
+
+  PHP_NEW_EXTENSION(symfony_debug, symfony_debug.c, $ext_shared)
+fi
--- a/Resources/ext/config.w32
+++ b/Resources/ext/config.w32
@@ -0,0 +1,13 @@
+// $Id$
+// vim:ft=javascript
+
+// If your extension references something external, use ARG_WITH
+// ARG_WITH("symfony_debug", "for symfony_debug support", "no");
+
+// Otherwise, use ARG_ENABLE
+// ARG_ENABLE("symfony_debug", "enable symfony_debug support", "no");
+
+if (PHP_SYMFONY_DEBUG != "no") {
+	EXTENSION("symfony_debug", "symfony_debug.c");
+}
+
--- a/Resources/ext/php_symfony_debug.h
+++ b/Resources/ext/php_symfony_debug.h
@@ -0,0 +1,55 @@
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#ifndef PHP_SYMFONY_DEBUG_H
+#define PHP_SYMFONY_DEBUG_H
+
+extern zend_module_entry symfony_debug_module_entry;
+#define phpext_symfony_debug_ptr &symfony_debug_module_entry
+
+#define PHP_SYMFONY_DEBUG_VERSION "1.0"
+
+#ifdef PHP_WIN32
+#	define PHP_SYMFONY_DEBUG_API __declspec(dllexport)
+#elif defined(__GNUC__) && __GNUC__ >= 4
+#	define PHP_SYMFONY_DEBUG_API __attribute__ ((visibility("default")))
+#else
+#	define PHP_SYMFONY_DEBUG_API
+#endif
+
+#ifdef ZTS
+#include "TSRM.h"
+#endif
+
+ZEND_BEGIN_MODULE_GLOBALS(symfony_debug)
+	intptr_t req_rand_init;
+ZEND_END_MODULE_GLOBALS(symfony_debug)
+
+PHP_MINIT_FUNCTION(symfony_debug);
+PHP_MSHUTDOWN_FUNCTION(symfony_debug);
+PHP_RINIT_FUNCTION(symfony_debug);
+PHP_RSHUTDOWN_FUNCTION(symfony_debug);
+PHP_MINFO_FUNCTION(symfony_debug);
+PHP_GINIT_FUNCTION(symfony_debug);
+PHP_GSHUTDOWN_FUNCTION(symfony_debug);
+
+PHP_FUNCTION(symfony_zval_info);
+
+static char *_symfony_debug_memory_address_hash(void *);
+static const char *_symfony_debug_zval_type(zval *);
+static const char* _symfony_debug_get_resource_type(long);
+static int _symfony_debug_get_resource_refcount(long);
+
+#ifdef ZTS
+#define SYMFONY_DEBUG_G(v) TSRMG(symfony_debug_globals_id, zend_symfony_debug_globals *, v)
+#else
+#define SYMFONY_DEBUG_G(v) (symfony_debug_globals.v)
+#endif
+
+#endif	/* PHP_SYMFONY_DEBUG_H */
--- a/Resources/ext/symfony_debug.c
+++ b/Resources/ext/symfony_debug.c
@@ -0,0 +1,224 @@
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "php.h"
+#include "php_ini.h"
+#include "ext/standard/info.h"
+#include "php_symfony_debug.h"
+#include "ext/standard/php_rand.h"
+#include "ext/standard/php_lcg.h"
+#include "ext/spl/php_spl.h"
+#include "Zend/zend_gc.h"
+
+ZEND_DECLARE_MODULE_GLOBALS(symfony_debug)
+
+ZEND_BEGIN_ARG_INFO_EX(symfony_zval_arginfo, 0, 0, 2)
+	ZEND_ARG_INFO(0, key)
+	ZEND_ARG_ARRAY_INFO(0, array, 0)
+	ZEND_ARG_INFO(0, options)
+ZEND_END_ARG_INFO()
+
+const zend_function_entry symfony_debug_functions[] = {
+	PHP_FE(symfony_zval_info,	symfony_zval_arginfo)
+	PHP_FE_END
+};
+
+PHP_FUNCTION(symfony_zval_info)
+{
+	zval *key = NULL, *arg = NULL;
+	zval **data = NULL;
+	HashTable *array = NULL;
+	long options = 0;
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "zh|l", &key, &array, &options) == FAILURE) {
+		return;
+	}
+
+	switch (Z_TYPE_P(key)) {
+		case IS_STRING:
+			if (zend_symtable_find(array, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&data) == FAILURE) {
+				return;
+			}
+		break;
+		case IS_LONG:
+			if (zend_hash_index_find(array, Z_LVAL_P(key), (void **)&data)) {
+				return;
+			}
+		break;
+	}
+
+	arg = *data;
+
+	array_init(return_value);
+
+	add_assoc_string(return_value, "type", (char *)_symfony_debug_zval_type(arg), 1);
+	add_assoc_stringl(return_value, "zval_hash", _symfony_debug_memory_address_hash((void *)arg), 16, 1);
+	add_assoc_long(return_value, "zval_refcount", Z_REFCOUNT_P(arg));
+	add_assoc_bool(return_value, "zval_isref", (zend_bool)Z_ISREF_P(arg));
+
+	if (Z_TYPE_P(arg) == IS_OBJECT) {
+		static char hash[33] = {0};
+		php_spl_object_hash(arg, (char *)hash);
+		add_assoc_stringl(return_value, "object_class", (char *)Z_OBJCE_P(arg)->name, Z_OBJCE_P(arg)->name_length, 1);
+		add_assoc_long(return_value, "object_refcount", EG(objects_store).object_buckets[Z_OBJ_HANDLE_P(arg)].bucket.obj.refcount);
+		add_assoc_string(return_value, "object_hash", hash, 1);
+		add_assoc_long(return_value, "object_handle", Z_OBJ_HANDLE_P(arg));
+	} else if (Z_TYPE_P(arg) == IS_ARRAY) {
+		add_assoc_long(return_value, "array_count", zend_hash_num_elements(Z_ARRVAL_P(arg)));
+	} else if(Z_TYPE_P(arg) == IS_RESOURCE) {
+		add_assoc_long(return_value, "resource_handle", Z_LVAL_P(arg));
+		add_assoc_string(return_value, "resource_type", (char *)_symfony_debug_get_resource_type(Z_LVAL_P(arg)), 1);
+		add_assoc_long(return_value, "resource_refcount", _symfony_debug_get_resource_refcount(Z_LVAL_P(arg)));
+	} else if (Z_TYPE_P(arg) == IS_STRING) {
+		add_assoc_long(return_value, "strlen", Z_STRLEN_P(arg));
+	}
+}
+
+static const char* _symfony_debug_get_resource_type(long rsid)
+{
+	const char *res_type;
+	res_type = zend_rsrc_list_get_rsrc_type(rsid);
+
+	if (!res_type) {
+		return "Unknown";
+	}
+
+	return res_type;
+}
+
+static int _symfony_debug_get_resource_refcount(long rsid)
+{
+	zend_rsrc_list_entry *le;
+
+	if (zend_hash_index_find(&EG(regular_list), rsid, (void **) &le)==SUCCESS) {
+		return le->refcount;
+	}
+
+	return 0;
+}
+
+static char *_symfony_debug_memory_address_hash(void *address)
+{
+	static char result[17] = {0};
+	intptr_t address_rand;
+
+	if (!SYMFONY_DEBUG_G(req_rand_init)) {
+		if (!BG(mt_rand_is_seeded)) {
+			php_mt_srand(GENERATE_SEED() TSRMLS_CC);
+		}
+		SYMFONY_DEBUG_G(req_rand_init) = (intptr_t)php_mt_rand();
+	}
+
+	address_rand = (intptr_t)address ^ SYMFONY_DEBUG_G(req_rand_init);
+
+	snprintf(result, 17, "%016zx", address_rand);
+
+	return result;
+}
+
+static const char *_symfony_debug_zval_type(zval *zv)
+{
+	switch (Z_TYPE_P(zv)) {
+		case IS_NULL:
+			return "NULL";
+			break;
+
+		case IS_BOOL:
+			return "boolean";
+			break;
+
+		case IS_LONG:
+			return "integer";
+			break;
+
+		case IS_DOUBLE:
+			return "double";
+			break;
+
+		case IS_STRING:
+			return "string";
+			break;
+
+		case IS_ARRAY:
+			return "array";
+			break;
+
+		case IS_OBJECT:
+			return "object";
+
+		case IS_RESOURCE:
+			return "resource";
+
+		default:
+			return "unknown type";
+	}
+}
+
+zend_module_entry symfony_debug_module_entry = {
+	STANDARD_MODULE_HEADER,
+	"symfony_debug",
+	symfony_debug_functions,
+	PHP_MINIT(symfony_debug),
+	PHP_MSHUTDOWN(symfony_debug),
+	PHP_RINIT(symfony_debug),
+	PHP_RSHUTDOWN(symfony_debug),
+	PHP_MINFO(symfony_debug),
+	PHP_SYMFONY_DEBUG_VERSION,
+	PHP_MODULE_GLOBALS(symfony_debug),
+	PHP_GINIT(symfony_debug),
+	PHP_GSHUTDOWN(symfony_debug),
+	NULL,
+	STANDARD_MODULE_PROPERTIES_EX
+};
+
+#ifdef COMPILE_DL_SYMFONY_DEBUG
+ZEND_GET_MODULE(symfony_debug)
+#endif
+
+PHP_GINIT_FUNCTION(symfony_debug)
+{
+	symfony_debug_globals->req_rand_init = 0;
+}
+
+PHP_GSHUTDOWN_FUNCTION(symfony_debug)
+{
+
+}
+
+PHP_MINIT_FUNCTION(symfony_debug)
+{
+	return SUCCESS;
+}
+
+PHP_MSHUTDOWN_FUNCTION(symfony_debug)
+{
+	return SUCCESS;
+}
+
+PHP_RINIT_FUNCTION(symfony_debug)
+{
+	return SUCCESS;
+}
+
+PHP_RSHUTDOWN_FUNCTION(symfony_debug)
+{
+	return SUCCESS;
+}
+
+PHP_MINFO_FUNCTION(symfony_debug)
+{
+	php_info_print_table_start();
+	php_info_print_table_header(2, "Symfony Debug support", "enabled");
+	php_info_print_table_header(2, "Symfony Debug version", PHP_SYMFONY_DEBUG_VERSION);
+	php_info_print_table_end();
+}
--- a/Resources/ext/tests/001.phpt
+++ b/Resources/ext/tests/001.phpt
@@ -0,0 +1,151 @@
+--TEST--
+Test symfony_zval_info API
+--SKIPIF--
+<?php if (!extension_loaded("symfony_debug")) print "skip"; ?>
+--FILE--
+<?php 
+
+$int = 42;
+$float = 42.42;
+$str = "foobar";
+$object = new StdClass;
+$array = array('foo', 'bar');
+$resource = tmpfile();
+$null = null;
+$bool = true;
+
+$anotherint = 42;
+$refcount2 = &$anotherint;
+
+$var = array('int' => $int,
+			 'float' => $float,
+			 'str' => $str,
+			 'object' => $object,
+			 'array' => $array,
+			 'resource' => $resource,
+			 'null' => $null,
+			 'bool' => $bool,
+			 'refcount' => &$refcount2);
+
+var_dump(symfony_zval_info('int', $var));
+var_dump(symfony_zval_info('float', $var));
+var_dump(symfony_zval_info('str', $var));
+var_dump(symfony_zval_info('object', $var));
+var_dump(symfony_zval_info('array', $var));
+var_dump(symfony_zval_info('resource', $var));
+var_dump(symfony_zval_info('null', $var));
+var_dump(symfony_zval_info('bool', $var));
+
+var_dump(symfony_zval_info('refcount', $var));
+var_dump(symfony_zval_info('not-exist', $var));
+?>
+--EXPECTF--
+array(4) {
+  ["type"]=>
+  string(7) "integer"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+}
+array(4) {
+  ["type"]=>
+  string(6) "double"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+}
+array(5) {
+  ["type"]=>
+  string(6) "string"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+  ["strlen"]=>
+  int(6)
+}
+array(8) {
+  ["type"]=>
+  string(6) "object"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+  ["object_class"]=>
+  string(8) "stdClass"
+  ["object_refcount"]=>
+  int(1)
+  ["object_hash"]=>
+  string(32) "%s"
+  ["object_handle"]=>
+  int(1)
+}
+array(5) {
+  ["type"]=>
+  string(5) "array"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+  ["array_count"]=>
+  int(2)
+}
+array(7) {
+  ["type"]=>
+  string(8) "resource"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+  ["resource_handle"]=>
+  int(4)
+  ["resource_type"]=>
+  string(6) "stream"
+  ["resource_refcount"]=>
+  int(1)
+}
+array(4) {
+  ["type"]=>
+  string(4) "NULL"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+}
+array(4) {
+  ["type"]=>
+  string(7) "boolean"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(2)
+  ["zval_isref"]=>
+  bool(false)
+}
+array(4) {
+  ["type"]=>
+  string(7) "integer"
+  ["zval_hash"]=>
+  string(16) "%s"
+  ["zval_refcount"]=>
+  int(3)
+  ["zval_isref"]=>
+  bool(true)
+}
+NULL
--- a/Tests/DebugClassLoaderTest.php
+++ b/Tests/DebugClassLoaderTest.php
@@ -0,0 +1,187 @@
+<?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\DebugClassLoader;
+use Symfony\Component\Debug\ErrorHandler;
+use Symfony\Component\Debug\Exception\ContextErrorException;
+
+class DebugClassLoaderTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var int Error reporting level before running tests.
+     */
+    private $errorReporting;
+
+    private $loader;
+
+    protected function setUp()
+    {
+        $this->errorReporting = error_reporting(E_ALL | E_STRICT);
+        $this->loader = new ClassLoader();
+        spl_autoload_register(array($this->loader, 'loadClass'), true, true);
+        DebugClassLoader::enable();
+    }
+
+    protected function tearDown()
+    {
+        DebugClassLoader::disable();
+        spl_autoload_unregister(array($this->loader, 'loadClass'));
+        error_reporting($this->errorReporting);
+    }
+
+    public function testIdempotence()
+    {
+        DebugClassLoader::enable();
+
+        $functions = spl_autoload_functions();
+        foreach ($functions as $function) {
+            if (is_array($function) && $function[0] instanceof DebugClassLoader) {
+                $reflClass = new \ReflectionClass($function[0]);
+                $reflProp = $reflClass->getProperty('classLoader');
+                $reflProp->setAccessible(true);
+
+                $this->assertNotInstanceOf('Symfony\Component\Debug\DebugClassLoader', $reflProp->getValue($function[0]));
+
+                return;
+            }
+        }
+
+        $this->fail('DebugClassLoader did not register');
+    }
+
+    public function testUnsilencing()
+    {
+        ob_start();
+
+        $this->iniSet('log_errors', 0);
+        $this->iniSet('display_errors', 1);
+
+        // See below: this will fail with parse error
+        // but this should not be @-silenced.
+        @class_exists(__NAMESPACE__.'\TestingUnsilencing', true);
+
+        $output = ob_get_clean();
+
+        $this->assertStringMatchesFormat('%aParse error%a', $output);
+    }
+
+    public function testStacking()
+    {
+        // the ContextErrorException must not be loaded to test the workaround
+        // for https://bugs.php.net/65322.
+        if (class_exists('Symfony\Component\Debug\Exception\ContextErrorException', false)) {
+            $this->markTestSkipped('The ContextErrorException class is already loaded.');
+        }
+
+        ErrorHandler::register();
+
+        try {
+            // Trigger autoloading + E_STRICT at compile time
+            // which in turn triggers $errorHandler->handle()
+            // that again triggers autoloading for ContextErrorException.
+            // Error stacking works around the bug above and everything is fine.
+
+            eval('
+                namespace '.__NAMESPACE__.';
+                class ChildTestingStacking extends TestingStacking { function foo($bar) {} }
+            ');
+            $this->fail('ContextErrorException expected');
+        } catch (\ErrorException $exception) {
+            // if an exception is thrown, the test passed
+            restore_error_handler();
+            restore_exception_handler();
+            $this->assertEquals(E_STRICT, $exception->getSeverity());
+            $this->assertStringStartsWith(__FILE__, $exception->getFile());
+            $this->assertRegexp('/^Runtime Notice: Declaration/', $exception->getMessage());
+        } catch (\Exception $exception) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $exception;
+        }
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testNameCaseMismatch()
+    {
+        class_exists(__NAMESPACE__.'\TestingCaseMismatch', true);
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testFileCaseMismatch()
+    {
+        if (!file_exists(__DIR__.'/Fixtures/CaseMismatch.php')) {
+            $this->markTestSkipped('Can only be run on case insensitive filesystems');
+        }
+
+        class_exists(__NAMESPACE__.'\Fixtures\CaseMismatch', true);
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testPsr4CaseMismatch()
+    {
+        class_exists(__NAMESPACE__.'\Fixtures\Psr4CaseMismatch', true);
+    }
+
+    public function testNotPsr0()
+    {
+        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\NotPSR0', true));
+    }
+
+    public function testNotPsr0Bis()
+    {
+        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\NotPSR0bis', true));
+    }
+
+    public function testClassAlias()
+    {
+        $this->assertTrue(class_exists(__NAMESPACE__.'\Fixtures\ClassAlias', true));
+    }
+}
+
+class ClassLoader
+{
+    public function loadClass($class)
+    {
+    }
+
+    public function getClassMap()
+    {
+        return array(__NAMESPACE__.'\Fixtures\NotPSR0bis' => __DIR__.'/Fixtures/notPsr0Bis.php');
+    }
+
+    public function findFile($class)
+    {
+        if (__NAMESPACE__.'\TestingUnsilencing' === $class) {
+            eval('-- parse error --');
+        } elseif (__NAMESPACE__.'\TestingStacking' === $class) {
+            eval('namespace '.__NAMESPACE__.'; class TestingStacking { function foo() {} }');
+        } elseif (__NAMESPACE__.'\TestingCaseMismatch' === $class) {
+            eval('namespace '.__NAMESPACE__.'; class TestingCaseMisMatch {}');
+        } elseif (__NAMESPACE__.'\Fixtures\CaseMismatch' === $class) {
+            return __DIR__.'/Fixtures/CaseMismatch.php';
+        } elseif (__NAMESPACE__.'\Fixtures\Psr4CaseMismatch' === $class) {
+            return __DIR__.'/Fixtures/psr4/Psr4CaseMismatch.php';
+        } elseif (__NAMESPACE__.'\Fixtures\NotPSR0' === $class) {
+            return __DIR__.'/Fixtures/reallyNotPsr0.php';
+        } elseif (__NAMESPACE__.'\Fixtures\NotPSR0bis' === $class) {
+            return __DIR__.'/Fixtures/notPsr0Bis.php';
+        }
+    }
+}
--- a/Tests/ErrorHandlerTest.php
+++ b/Tests/ErrorHandlerTest.php
@@ -11,135 +11,96 @@

 namespace Symfony\Component\Debug\Tests;

+use Psr\Log\LogLevel;
 use Symfony\Component\Debug\ErrorHandler;
-use Symfony\Component\Debug\Exception\DummyException;
+use Symfony\Component\Debug\Exception\ContextErrorException;

 /**
- * ErrorHandlerTest
+ * ErrorHandlerTest.
 *
 * @author Robert Schönthal <seroscho@googlemail.com>
+ * @author Nicolas Grekas <p@tchwork.com>
 */
 class ErrorHandlerTest extends \PHPUnit_Framework_TestCase
 {
-    /**
-     * @var int Error reporting level before running tests.
-     */
-    protected $errorReporting;
-
-    /**
-     * @var string Display errors setting before running tests.
-     */
-    protected $displayErrors;
-
-    public function setUp()
+    public function testRegister()
    {
-        $this->errorReporting = error_reporting(E_ALL | E_STRICT);
-        $this->displayErrors = ini_get('display_errors');
-        ini_set('display_errors', '1');
-    }
+        $handler = ErrorHandler::register();

-    public function tearDown()
-    {
-        ini_set('display_errors', $this->displayErrors);
-        error_reporting($this->errorReporting);
-    }
-
-    public function testCompileTimeError()
-    {
-        // the ContextErrorException must not be loaded to test the workaround
-        // for https://bugs.php.net/bug.php?id=65322.
-        if (class_exists('Symfony\Component\Debug\Exception\ContextErrorException', false)) {
-            $this->markTestSkipped('The ContextErrorException class is already loaded.');
-        }
-
-        $exceptionHandler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('handle'));
-
-        // the following code forces some PHPUnit classes to be loaded
-        // so that they will be available in the exception handler
-        // as they won't be autoloaded by PHP
-        class_exists('PHPUnit_Framework_MockObject_Invocation_Object');
-        $this->assertInstanceOf('stdClass', new \stdClass());
-        $this->assertEquals(1, 1);
-        $this->assertStringStartsWith('foo', 'foobar');
-        $this->assertArrayHasKey('bar', array('bar' => 'foo'));
-
-        $that = $this;
-        $exceptionCheck = function ($exception) use ($that) {
-            $that->assertInstanceOf('Symfony\Component\Debug\Exception\ContextErrorException', $exception);
-            $that->assertEquals(E_STRICT, $exception->getSeverity());
-            $that->assertEquals(2, $exception->getLine());
-            $that->assertStringStartsWith('Runtime Notice: Declaration of _CompileTimeError::foo() should be compatible with', $exception->getMessage());
-            $that->assertArrayHasKey('bar', $exception->getContext());
-        };
-
-        $exceptionHandler->expects($this->once())
-            ->method('handle')
-            ->will($this->returnCallback($exceptionCheck))
-        ;
-
-        ErrorHandler::register();
-        set_exception_handler(array($exceptionHandler, 'handle'));
-
-        // dummy variable to check for in error handler.
-        $bar = 123;
-
-        // trigger compile time error
        try {
-            eval(<<<'PHP'
-class _BaseCompileTimeError { function foo() {} }
-class _CompileTimeError extends _BaseCompileTimeError { function foo($invalid) {} }
-PHP
-            );
-        } catch (DummyException $e) {
-            // if an exception is thrown, the test passed
+            $this->assertInstanceOf('Symfony\Component\Debug\ErrorHandler', $handler);
+            $this->assertSame($handler, ErrorHandler::register());
+
+            $newHandler = new ErrorHandler();
+
+            $this->assertSame($newHandler, ErrorHandler::register($newHandler, false));
+            $h = set_error_handler('var_dump');
+            restore_error_handler();
+            $this->assertSame(array($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);
+            } catch (\Exception $e) {
+            }
+
+            restore_error_handler();
+            restore_exception_handler();
+
+            if (isset($e)) {
+                throw $e;
+            }
+        } catch (\Exception $e) {
        }

        restore_error_handler();
        restore_exception_handler();
+
+        if (isset($e)) {
+            throw $e;
+        }
    }

    public function testNotice()
    {
-        $exceptionHandler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('handle'));
-        set_exception_handler(array($exceptionHandler, 'handle'));
-
-        $that = $this;
-        $exceptionCheck = function ($exception) use ($that) {
-            $that->assertInstanceOf('Symfony\Component\Debug\Exception\ContextErrorException', $exception);
-            $that->assertEquals(E_NOTICE, $exception->getSeverity());
-            $that->assertEquals(__LINE__ + 40, $exception->getLine());
-            $that->assertEquals(__FILE__, $exception->getFile());
-            $that->assertRegexp('/^Notice: Undefined variable: (foo|bar)/', $exception->getMessage());
-            $that->assertArrayHasKey('foobar', $exception->getContext());
-
-            $trace = $exception->getTrace();
-            $that->assertEquals(__FILE__, $trace[0]['file']);
-            $that->assertEquals('Symfony\Component\Debug\ErrorHandler', $trace[0]['class']);
-            $that->assertEquals('handle', $trace[0]['function']);
-            $that->assertEquals('->', $trace[0]['type']);
-
-            $that->assertEquals(__FILE__, $trace[1]['file']);
-            $that->assertEquals(__CLASS__, $trace[1]['class']);
-            $that->assertEquals('triggerNotice', $trace[1]['function']);
-            $that->assertEquals('::', $trace[1]['type']);
-
-            $that->assertEquals(__CLASS__, $trace[2]['class']);
-            $that->assertEquals('testNotice', $trace[2]['function']);
-            $that->assertEquals('->', $trace[2]['type']);
-        };
-
-        $exceptionHandler->expects($this->once())
-            ->method('handle')
-            ->will($this->returnCallback($exceptionCheck));
        ErrorHandler::register();

        try {
            self::triggerNotice($this);
-        } catch (DummyException $e) {
+            $this->fail('ContextErrorException expected');
+        } catch (ContextErrorException $exception) {
            // if an exception is thrown, the test passed
-        }
+            restore_error_handler();
+            restore_exception_handler();

-        restore_error_handler();
+            $this->assertEquals(E_NOTICE, $exception->getSeverity());
+            $this->assertEquals(__FILE__, $exception->getFile());
+            $this->assertRegexp('/^Notice: Undefined variable: (foo|bar)/', $exception->getMessage());
+            $this->assertArrayHasKey('foobar', $exception->getContext());
+
+            $trace = $exception->getTrace();
+            $this->assertEquals(__FILE__, $trace[0]['file']);
+            $this->assertEquals('Symfony\Component\Debug\ErrorHandler', $trace[0]['class']);
+            $this->assertEquals('handleError', $trace[0]['function']);
+            $this->assertEquals('->', $trace[0]['type']);
+
+            $this->assertEquals(__FILE__, $trace[1]['file']);
+            $this->assertEquals(__CLASS__, $trace[1]['class']);
+            $this->assertEquals('triggerNotice', $trace[1]['function']);
+            $this->assertEquals('::', $trace[1]['type']);
+
+            $this->assertEquals(__FILE__, $trace[1]['file']);
+            $this->assertEquals(__CLASS__, $trace[2]['class']);
+            $this->assertEquals(__FUNCTION__, $trace[2]['function']);
+            $this->assertEquals('->', $trace[2]['type']);
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
    }

    // dummy function to test trace in error handler.
@@ -152,71 +113,290 @@ PHP

    public function testConstruct()
    {
-        $handler = ErrorHandler::register(3);
+        try {
+            $handler = ErrorHandler::register();
+            $handler->throwAt(3, true);
+            $this->assertEquals(3 | E_RECOVERABLE_ERROR | E_USER_ERROR, $handler->throwAt(0));

-        $level = new \ReflectionProperty($handler, 'level');
-        $level->setAccessible(true);
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();

-        $this->assertEquals(3, $level->getValue($handler));
-
-        restore_error_handler();
+            throw $e;
+        }
    }

-    public function testHandle()
+    public function testDefaultLogger()
    {
-        $handler = ErrorHandler::register(0);
-        $this->assertFalse($handler->handle(0, 'foo', 'foo.php', 12, array()));
-
-        restore_error_handler();
-
-        $handler = ErrorHandler::register(3);
-        $this->assertFalse($handler->handle(4, 'foo', 'foo.php', 12, array()));
-
-        restore_error_handler();
-
-        $handler = ErrorHandler::register(3);
        try {
-            $handler->handle(111, 'foo', 'foo.php', 12, array());
-        } catch (\ErrorException $e) {
-            $this->assertSame('111: foo in foo.php line 12', $e->getMessage());
-            $this->assertSame(111, $e->getSeverity());
-            $this->assertSame('foo.php', $e->getFile());
-            $this->assertSame(12, $e->getLine());
+            $handler = ErrorHandler::register();
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $handler->setDefaultLogger($logger, E_NOTICE);
+            $handler->setDefaultLogger($logger, array(E_USER_NOTICE => LogLevel::CRITICAL));
+
+            $loggers = array(
+                E_DEPRECATED => array(null, LogLevel::INFO),
+                E_USER_DEPRECATED => array(null, LogLevel::INFO),
+                E_NOTICE => array($logger, LogLevel::NOTICE),
+                E_USER_NOTICE => array($logger, LogLevel::CRITICAL),
+                E_STRICT => array(null, LogLevel::NOTICE),
+                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::ERROR),
+                E_RECOVERABLE_ERROR => array(null, LogLevel::ERROR),
+                E_COMPILE_ERROR => array(null, LogLevel::EMERGENCY),
+                E_PARSE => array(null, LogLevel::EMERGENCY),
+                E_ERROR => array(null, LogLevel::EMERGENCY),
+                E_CORE_ERROR => array(null, LogLevel::EMERGENCY),
+            );
+            $this->assertSame($loggers, $handler->setLoggers(array()));
+
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
        }
+    }

-        restore_error_handler();
+    public function testHandleError()
+    {
+        $this->iniSet('error_reporting', -1);

-        $handler = ErrorHandler::register(E_USER_DEPRECATED);
-        $this->assertTrue($handler->handle(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));
+        try {
+            $handler = ErrorHandler::register();
+            $handler->throwAt(0, true);
+            $this->assertFalse($handler->handleError(0, 'foo', 'foo.php', 12, array()));

-        restore_error_handler();
+            restore_error_handler();
+            restore_exception_handler();

-        $handler = ErrorHandler::register(E_DEPRECATED);
-        $this->assertTrue($handler->handle(E_DEPRECATED, 'foo', 'foo.php', 12, array()));
+            $handler = ErrorHandler::register();
+            $handler->throwAt(3, true);
+            $this->assertFalse($handler->handleError(4, 'foo', 'foo.php', 12, array()));

-        restore_error_handler();
+            restore_error_handler();
+            restore_exception_handler();

-        $logger = $this->getMock('Psr\Log\LoggerInterface');
+            $handler = ErrorHandler::register();
+            $handler->throwAt(3, true);
+            try {
+                $handler->handleError(4, 'foo', 'foo.php', 12, array());
+            } catch (\ErrorException $e) {
+                $this->assertSame('Parse Error: foo', $e->getMessage());
+                $this->assertSame(4, $e->getSeverity());
+                $this->assertSame('foo.php', $e->getFile());
+                $this->assertSame(12, $e->getLine());
+            }

-        $that = $this;
-        $warnArgCheck = function ($message, $context) use ($that) {
-            $that->assertEquals('foo', $message);
-            $that->assertArrayHasKey('type', $context);
-            $that->assertEquals($context['type'], ErrorHandler::TYPE_DEPRECATION);
-            $that->assertArrayHasKey('stack', $context);
-            $that->assertInternalType('array', $context['stack']);
-        };
+            restore_error_handler();
+            restore_exception_handler();

-        $logger
-            ->expects($this->once())
-            ->method('warning')
-            ->will($this->returnCallback($warnArgCheck))
-        ;
+            $handler = ErrorHandler::register();
+            $handler->throwAt(E_USER_DEPRECATED, true);
+            $this->assertFalse($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));

-        $handler = ErrorHandler::register(E_USER_DEPRECATED);
-        $handler->setLogger($logger);
-        $handler->handle(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array());
+            restore_error_handler();
+            restore_exception_handler();

-        restore_error_handler();
+            $handler = ErrorHandler::register();
+            $handler->throwAt(E_DEPRECATED, true);
+            $this->assertFalse($handler->handleError(E_DEPRECATED, 'foo', 'foo.php', 12, array()));
+
+            restore_error_handler();
+            restore_exception_handler();
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $that = $this;
+            $warnArgCheck = function ($logLevel, $message, $context) use ($that) {
+                $that->assertEquals('info', $logLevel);
+                $that->assertEquals('foo', $message);
+                $that->assertArrayHasKey('type', $context);
+                $that->assertEquals($context['type'], E_USER_DEPRECATED);
+                $that->assertArrayHasKey('stack', $context);
+                $that->assertInternalType('array', $context['stack']);
+            };
+
+            $logger
+                ->expects($this->once())
+                ->method('log')
+                ->will($this->returnCallback($warnArgCheck))
+            ;
+
+            $handler = ErrorHandler::register();
+            $handler->setDefaultLogger($logger, E_USER_DEPRECATED);
+            $this->assertTrue($handler->handleError(E_USER_DEPRECATED, 'foo', 'foo.php', 12, array()));
+
+            restore_error_handler();
+            restore_exception_handler();
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $that = $this;
+            $logArgCheck = function ($level, $message, $context) use ($that) {
+                $that->assertEquals('Undefined variable: undefVar', $message);
+                $that->assertArrayHasKey('type', $context);
+                $that->assertEquals($context['type'], E_NOTICE);
+            };
+
+            $logger
+                ->expects($this->once())
+                ->method('log')
+                ->will($this->returnCallback($logArgCheck))
+            ;
+
+            $handler = ErrorHandler::register();
+            $handler->setDefaultLogger($logger, E_NOTICE);
+            $handler->screamAt(E_NOTICE);
+            unset($undefVar);
+            @$undefVar++;
+
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
+    }
+
+    public function testHandleException()
+    {
+        try {
+            $handler = ErrorHandler::register();
+
+            $exception = new \Exception('foo');
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $that = $this;
+            $logArgCheck = function ($level, $message, $context) use ($that) {
+                $that->assertEquals('Uncaught Exception: foo', $message);
+                $that->assertArrayHasKey('type', $context);
+                $that->assertEquals($context['type'], E_ERROR);
+            };
+
+            $logger
+                ->expects($this->exactly(2))
+                ->method('log')
+                ->will($this->returnCallback($logArgCheck))
+            ;
+
+            $handler->setDefaultLogger($logger, E_ERROR);
+
+            try {
+                $handler->handleException($exception);
+                $this->fail('Exception expected');
+            } catch (\Exception $e) {
+                $this->assertSame($exception, $e);
+            }
+
+            $that = $this;
+            $handler->setExceptionHandler(function ($e) use ($exception, $that) {
+                $that->assertSame($exception, $e);
+            });
+
+            $handler->handleException($exception);
+
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
+    }
+
+    public function testHandleFatalError()
+    {
+        try {
+            $handler = ErrorHandler::register();
+
+            $error = array(
+                'type' => E_PARSE,
+                'message' => 'foo',
+                'file' => 'bar',
+                'line' => 123,
+            );
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $that = $this;
+            $logArgCheck = function ($level, $message, $context) use ($that) {
+                $that->assertEquals('Fatal Parse Error: foo', $message);
+                $that->assertArrayHasKey('type', $context);
+                $that->assertEquals($context['type'], E_ERROR);
+            };
+
+            $logger
+                ->expects($this->once())
+                ->method('log')
+                ->will($this->returnCallback($logArgCheck))
+            ;
+
+            $handler->setDefaultLogger($logger, E_ERROR);
+
+            $handler->handleFatalError($error);
+
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
+    }
+
+    public function testLegacyInterface()
+    {
+        $this->iniSet('error_reporting', -1 & ~E_USER_DEPRECATED);
+
+        try {
+            $handler = ErrorHandler::register(0);
+            $this->assertFalse($handler->handle(0, 'foo', 'foo.php', 12, array()));
+
+            restore_error_handler();
+            restore_exception_handler();
+
+            $logger = $this->getMock('Psr\Log\LoggerInterface');
+
+            $that = $this;
+            $logArgCheck = function ($level, $message, $context) use ($that) {
+                $that->assertEquals('Undefined variable: undefVar', $message);
+                $that->assertArrayHasKey('type', $context);
+                $that->assertEquals($context['type'], E_NOTICE);
+            };
+
+            $logger
+                ->expects($this->once())
+                ->method('log')
+                ->will($this->returnCallback($logArgCheck))
+            ;
+
+            $handler = ErrorHandler::register(E_NOTICE);
+            $handler->setLogger($logger, 'scream');
+            unset($undefVar);
+            @$undefVar++;
+
+            restore_error_handler();
+            restore_exception_handler();
+        } catch (\Exception $e) {
+            restore_error_handler();
+            restore_exception_handler();
+
+            throw $e;
+        }
    }
 }
--- a/Tests/Exception/FlattenExceptionTest.php
+++ b/Tests/Exception/FlattenExceptionTest.php
@@ -126,9 +126,9 @@ class FlattenExceptionTest extends \PHPUnit_Framework_TestCase

        $flattened->setPrevious($flattened2);

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

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

    /**
@@ -162,7 +162,7 @@ class FlattenExceptionTest extends \PHPUnit_Framework_TestCase
                'message' => 'test',
                'class' => 'Exception',
                'trace' => array(array(
-                    'namespace' => '', 'short_class' => '', 'class' => '','type' => '','function' => '', 'file' => 'foo.php', 'line' => 123,
+                    'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => '', 'file' => 'foo.php', 'line' => 123,
                    'args' => array(),
                )),
            ),
@@ -186,6 +186,28 @@ class FlattenExceptionTest extends \PHPUnit_Framework_TestCase
        $this->assertContains('*DEEP NESTED ARRAY*', serialize($trace));
    }

+    public function testTooBigArray()
+    {
+        $a = array();
+        for ($i = 0; $i < 20; $i++) {
+            for ($j = 0; $j < 50; $j++) {
+                for ($k = 0; $k < 10; $k++) {
+                    $a[$i][$j][$k] = 'value';
+                }
+            }
+        }
+        $a[20] = 'value';
+        $a[21] = 'value1';
+        $exception = $this->createException($a);
+
+        $flattened = FlattenException::create($exception);
+        $trace = $flattened->getTrace();
+        $serializeTrace = serialize($trace);
+
+        $this->assertContains('*SKIPPED over 10000 entries*', $serializeTrace);
+        $this->assertNotContains('*value1*', $serializeTrace);
+    }
+
    private function createException($foo)
    {
        return new \Exception();
@@ -214,12 +236,12 @@ class FlattenExceptionTest extends \PHPUnit_Framework_TestCase
                'class' => 'Exception',
                'trace' => array(
                    array(
-                        'namespace' => '', 'short_class' => '', 'class' => '','type' => '','function' => '',
+                        'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => '',
                        'file' => 'foo.php', 'line' => 123,
                        'args' => array(),
                    ),
                    array(
-                        'namespace' => '', 'short_class' => '', 'class' => '','type' => '','function' => 'test',
+                        'namespace' => '', 'short_class' => '', 'class' => '', 'type' => '', 'function' => 'test',
                        'file' => __FILE__, 'line' => 123,
                        'args' => array(
                            array(
--- a/Tests/ExceptionHandlerTest.php
+++ b/Tests/ExceptionHandlerTest.php
@@ -12,31 +12,26 @@
 namespace Symfony\Component\Debug\Tests;

 use Symfony\Component\Debug\ExceptionHandler;
+use Symfony\Component\Debug\Exception\OutOfMemoryException;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;

 class ExceptionHandlerTest extends \PHPUnit_Framework_TestCase
 {
-    protected function setUp()
-    {
-        if (!class_exists('Symfony\Component\HttpFoundation\Request')) {
-            $this->markTestSkipped('The "HttpFoundation" component is not available');
-        }
-    }
-
    public function testDebug()
    {
        $handler = new ExceptionHandler(false);
        $response = $handler->createResponse(new \RuntimeException('Foo'));

        $this->assertContains('<h1>Whoops, looks like something went wrong.</h1>', $response->getContent());
-        $this->assertNotContains('<div class="block_exception clear_fix">', $response->getContent());
+        $this->assertNotContains('<h2 class="block_exception clear_fix">', $response->getContent());

        $handler = new ExceptionHandler(true);
        $response = $handler->createResponse(new \RuntimeException('Foo'));

        $this->assertContains('<h1>Whoops, looks like something went wrong.</h1>', $response->getContent());
-        $this->assertContains('<div class="block_exception clear_fix">', $response->getContent());
+        $this->assertContains('<h2 class="block_exception clear_fix">', $response->getContent());
    }

    public function testStatusCode()
@@ -66,4 +61,56 @@ class ExceptionHandlerTest extends \PHPUnit_Framework_TestCase
        $handler = new ExceptionHandler(true);
        $response = $handler->createResponse(new \RuntimeException('Foo', 0, new \RuntimeException('Bar')));
    }
+
+    public function testHandle()
+    {
+        $exception = new \Exception('foo');
+
+        if (class_exists('Symfony\Component\HttpFoundation\Response')) {
+            $handler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('createResponse'));
+            $handler
+                ->expects($this->exactly(2))
+                ->method('createResponse')
+                ->will($this->returnValue(new Response()));
+        } else {
+            $handler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('sendPhpResponse'));
+            $handler
+                ->expects($this->exactly(2))
+                ->method('sendPhpResponse');
+        }
+
+        $handler->handle($exception);
+
+        $that = $this;
+        $handler->setHandler(function ($e) use ($exception, $that) {
+            $that->assertSame($exception, $e);
+        });
+
+        $handler->handle($exception);
+    }
+
+    public function testHandleOutOfMemoryException()
+    {
+        $exception = new OutOfMemoryException('foo', 0, E_ERROR, __FILE__, __LINE__);
+
+        if (class_exists('Symfony\Component\HttpFoundation\Response')) {
+            $handler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('createResponse'));
+            $handler
+                ->expects($this->once())
+                ->method('createResponse')
+                ->will($this->returnValue(new Response()));
+        } else {
+            $handler = $this->getMock('Symfony\Component\Debug\ExceptionHandler', array('sendPhpResponse'));
+            $handler
+                ->expects($this->once())
+                ->method('sendPhpResponse');
+        }
+
+        $that = $this;
+        $handler->setHandler(function ($e) use ($that) {
+            $that->fail('OutOfMemoryException should bypass the handler');
+        });
+
+        $handler->handle($exception);
+    }
 }
--- a/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
+++ b/Tests/FatalErrorHandler/ClassNotFoundFatalErrorHandlerTest.php
@@ -0,0 +1,179 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\ClassLoader\ClassLoader as SymfonyClassLoader;
+use Symfony\Component\ClassLoader\UniversalClassLoader as SymfonyUniversalClassLoader;
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\FatalErrorHandler\ClassNotFoundFatalErrorHandler;
+
+class ClassNotFoundFatalErrorHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider provideClassNotFoundData
+     */
+    public function testHandleClassNotFound($error, $translatedMessage)
+    {
+        $handler = new ClassNotFoundFatalErrorHandler();
+
+        $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
+
+        $this->assertInstanceof('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
+        $this->assertSame($translatedMessage, $exception->getMessage());
+        $this->assertSame($error['type'], $exception->getSeverity());
+        $this->assertSame($error['file'], $exception->getFile());
+        $this->assertSame($error['line'], $exception->getLine());
+    }
+
+    /**
+     * @dataProvider provideLegacyClassNotFoundData
+     */
+    public function testLegacyHandleClassNotFound($error, $translatedMessage, $autoloader)
+    {
+        $this->iniSet('error_reporting', -1 & ~E_USER_DEPRECATED);
+
+        // Unregister all autoloaders to ensure the custom provided
+        // autoloader is the only one to be used during the test run.
+        $autoloaders = spl_autoload_functions();
+        array_map('spl_autoload_unregister', $autoloaders);
+        spl_autoload_register($autoloader);
+
+        $handler = new ClassNotFoundFatalErrorHandler();
+
+        $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
+
+        spl_autoload_unregister($autoloader);
+        array_map('spl_autoload_register', $autoloaders);
+
+        $this->assertInstanceof('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
+        $this->assertSame($translatedMessage, $exception->getMessage());
+        $this->assertSame($error['type'], $exception->getSeverity());
+        $this->assertSame($error['file'], $exception->getFile());
+        $this->assertSame($error['line'], $exception->getLine());
+    }
+
+    public function provideClassNotFoundData()
+    {
+        return array(
+            array(
+                array(
+                    '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(
+                    '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(
+                    '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(
+                    '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(
+                    '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\"?",
+            ),
+        );
+    }
+
+    public function provideLegacyClassNotFoundData()
+    {
+        $prefixes = array('Symfony\Component\Debug\Exception\\' => realpath(__DIR__.'/../../Exception'));
+
+        $symfonyAutoloader = new SymfonyClassLoader();
+        $symfonyAutoloader->addPrefixes($prefixes);
+
+        $symfonyUniversalClassLoader = new SymfonyUniversalClassLoader();
+        $symfonyUniversalClassLoader->registerPrefixes($prefixes);
+
+        return array(
+            array(
+                array(
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
+                ),
+                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
+                array($symfonyAutoloader, 'loadClass'),
+            ),
+            array(
+                array(
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Class \'Foo\\Bar\\UndefinedFunctionException\' not found',
+                ),
+                "Attempted to load class \"UndefinedFunctionException\" from namespace \"Foo\Bar\".\nDid you forget a \"use\" statement for \"Symfony\Component\Debug\Exception\UndefinedFunctionException\"?",
+                array($symfonyUniversalClassLoader, 'loadClass'),
+            ),
+            array(
+                array(
+                    '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?",
+                function ($className) { /* do nothing here */ },
+            ),
+        );
+    }
+
+    public function testCannotRedeclareClass()
+    {
+        if (!file_exists(__DIR__.'/../FIXTURES/REQUIREDTWICE.PHP')) {
+            $this->markTestSkipped('Can only be run on case insensitive filesystems');
+        }
+
+        require_once __DIR__.'/../FIXTURES/REQUIREDTWICE.PHP';
+
+        $error = array(
+            'type' => 1,
+            'line' => 12,
+            'file' => 'foo.php',
+            'message' => 'Class \'Foo\\Bar\\RequiredTwice\' not found',
+        );
+
+        $handler = new ClassNotFoundFatalErrorHandler();
+        $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
+
+        $this->assertInstanceof('Symfony\Component\Debug\Exception\ClassNotFoundException', $exception);
+    }
+}
--- a/Tests/FatalErrorHandler/UndefinedFunctionFatalErrorHandlerTest.php
+++ b/Tests/FatalErrorHandler/UndefinedFunctionFatalErrorHandlerTest.php
@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Debug\Tests\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedFunctionFatalErrorHandler;
+
+class UndefinedFunctionFatalErrorHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider provideUndefinedFunctionData
+     */
+    public function testUndefinedFunction($error, $translatedMessage)
+    {
+        $handler = new UndefinedFunctionFatalErrorHandler();
+        $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
+
+        $this->assertInstanceof('Symfony\Component\Debug\Exception\UndefinedFunctionException', $exception);
+        // class names are case insensitive and PHP/HHVM do not return the same
+        $this->assertSame(strtolower($translatedMessage), strtolower($exception->getMessage()));
+        $this->assertSame($error['type'], $exception->getSeverity());
+        $this->assertSame($error['file'], $exception->getFile());
+        $this->assertSame($error['line'], $exception->getLine());
+    }
+
+    public function provideUndefinedFunctionData()
+    {
+        return array(
+            array(
+                array(
+                    '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".',
+            ),
+        );
+    }
+}
+
+function test_namespaced_function()
+{
+}
--- a/Tests/FatalErrorHandler/UndefinedMethodFatalErrorHandlerTest.php
+++ b/Tests/FatalErrorHandler/UndefinedMethodFatalErrorHandlerTest.php
@@ -0,0 +1,66 @@
+<?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\FatalErrorHandler;
+
+use Symfony\Component\Debug\Exception\FatalErrorException;
+use Symfony\Component\Debug\FatalErrorHandler\UndefinedMethodFatalErrorHandler;
+
+class UndefinedMethodFatalErrorHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider provideUndefinedMethodData
+     */
+    public function testUndefinedMethod($error, $translatedMessage)
+    {
+        $handler = new UndefinedMethodFatalErrorHandler();
+        $exception = $handler->handleError($error, new FatalErrorException('', 0, $error['type'], $error['file'], $error['line']));
+
+        $this->assertInstanceof('Symfony\Component\Debug\Exception\UndefinedMethodException', $exception);
+        $this->assertSame($translatedMessage, $exception->getMessage());
+        $this->assertSame($error['type'], $exception->getSeverity());
+        $this->assertSame($error['file'], $exception->getFile());
+        $this->assertSame($error['line'], $exception->getLine());
+    }
+
+    public function provideUndefinedMethodData()
+    {
+        return array(
+            array(
+                array(
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Call to undefined method SplObjectStorage::what()',
+                ),
+                'Attempted to call method "what" on class "SplObjectStorage".',
+            ),
+            array(
+                array(
+                    'type' => 1,
+                    'line' => 12,
+                    'file' => 'foo.php',
+                    'message' => 'Call to undefined method SplObjectStorage::walid()',
+                ),
+                "Attempted to call method \"walid\" on 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 method \"offsetFet\" on class \"SplObjectStorage\".\nDid you mean to call e.g. \"offsetGet\", \"offsetSet\" or \"offsetUnset\"?",
+            ),
+        );
+    }
+}
--- a/Tests/Fixtures/ClassAlias.php
+++ b/Tests/Fixtures/ClassAlias.php
@@ -0,0 +1,3 @@
+<?php
+
+class_alias('Symfony\Component\Debug\Tests\Fixtures\NotPSR0bis', 'Symfony\Component\Debug\Tests\Fixtures\ClassAlias');
--- a/Tests/Fixtures/PEARClass.php
+++ b/Tests/Fixtures/PEARClass.php
@@ -0,0 +1,5 @@
+<?php
+
+class Symfony_Component_Debug_Tests_Fixtures_PEARClass
+{
+}
--- a/Tests/Fixtures/RequiredTwice.php
+++ b/Tests/Fixtures/RequiredTwice.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class RequiredTwice
+{
+}
--- a/Tests/Fixtures/casemismatch.php
+++ b/Tests/Fixtures/casemismatch.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class CaseMismatch
+{
+}
--- a/Tests/Fixtures/notPsr0Bis.php
+++ b/Tests/Fixtures/notPsr0Bis.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class NotPSR0bis
+{
+}
--- a/Tests/Fixtures/psr4/Psr4CaseMismatch.php
+++ b/Tests/Fixtures/psr4/Psr4CaseMismatch.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class PSR4CaseMismatch
+{
+}
--- a/Tests/Fixtures/reallyNotPsr0.php
+++ b/Tests/Fixtures/reallyNotPsr0.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+class NotPSR0
+{
+}
--- a/Tests/MockExceptionHandler.php
+++ b/Tests/MockExceptionHandler.php
@@ -0,0 +1,24 @@
+<?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/composer.json
+++ b/composer.json
@@ -16,16 +16,17 @@
        }
    ],
    "require": {
-        "php": ">=5.3.3"
+        "php": ">=5.3.3",
+        "psr/log": "~1.0"
    },
    "require-dev": {
-        "symfony/http-kernel": "~2.1",
+        "symfony/class-loader": "~2.2",
+        "symfony/http-kernel": "~2.3.24|~2.5.9|~2.6,>=2.6.2",
        "symfony/http-foundation": "~2.1"
    },
    "suggest": {
        "symfony/http-foundation": "",
-        "symfony/http-kernel": "",
-        "symfony/class-loader": ""
+        "symfony/http-kernel": ""
    },
    "autoload": {
        "psr-0": { "Symfony\\Component\\Debug\\": "" }
@@ -34,7 +35,7 @@
    "minimum-stability": "dev",
    "extra": {
        "branch-alias": {
-            "dev-master": "2.3-dev"
+            "dev-master": "2.6-dev"
        }
    }
 }
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -6,6 +6,10 @@
         colors="true"
         bootstrap="vendor/autoload.php"
 >
+    <php>
+        <!-- Silence E_USER_DEPRECATED (-16385 == -1 & ~E_USER_DEPRECATED) -->
+        <ini name="error_reporting" value="-16385"/>
+    </php>
    <testsuites>
        <testsuite name="Symfony Debug Component Test Suite">
            <directory>./Tests/</directory>