ErrorHandler::handleException() - Code Metrics - Inspection of "f58c1426fcf8afdbc6c251e60542600cd5bfe6f9" - itstructure/yii2-template-multilanguage - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Branch — master (f58c14)

by Andrey
created 2021-04-18 03:22 UTC
ErrorHandler::handleException() F

↳ Parent: ErrorHandler
Complexity

Conditions	22
Paths	5376
Size

Total Lines
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
cc	22
nc	5376
nop	2
dl	0
loc	66
rs	0
c	0
b	0
f	0
How to fix Long Method Complexity

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Debug;

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\FatalThrowableError;
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;

/**
 * A generic ErrorHandler for the PHP engine.
 *
 * 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 <[email protected]>
 */
class ErrorHandler
{
    /**
     * @deprecated since version 2.6, to be removed in 3.0.
     */
    const TYPE_DEPRECATION = -100;

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

    private $loggers = array(
        E_DEPRECATED => array(null, LogLevel::INFO),
        E_USER_DEPRECATED => array(null, LogLevel::INFO),
        E_NOTICE => array(null, LogLevel::WARNING),
        E_USER_NOTICE => array(null, LogLevel::WARNING),
        E_STRICT => array(null, LogLevel::WARNING),
        E_WARNING => array(null, LogLevel::WARNING),
        E_USER_WARNING => array(null, LogLevel::WARNING),
        E_COMPILE_WARNING => array(null, LogLevel::WARNING),
        E_CORE_WARNING => array(null, LogLevel::WARNING),
        E_USER_ERROR => array(null, LogLevel::CRITICAL),
        E_RECOVERABLE_ERROR => array(null, LogLevel::CRITICAL),
        E_COMPILE_ERROR => array(null, LogLevel::CRITICAL),
        E_PARSE => array(null, LogLevel::CRITICAL),
        E_ERROR => array(null, LogLevel::CRITICAL),
        E_CORE_ERROR => array(null, LogLevel::CRITICAL),
    );

    private $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 $loggedTraces = array();
    private $isRecursive = 0;
    private $isRoot = false;
    private $exceptionHandler;
    private $bootstrappingLogger;

    private static $reservedMemory;
    private static $stackedErrors = array();
    private static $stackedErrorLevels = array();
    private static $toStringException = null;
    private static $exitCode = 0;

    /**
     * Same init value as thrownErrors.
     *
     * @deprecated since version 2.6, to be removed in 3.0.
     */
    private $displayErrors = 0x1FFF;

    /**
     * Registers the error handler.
     *
     * @param self|null|int $handler The handler to register, or @deprecated (since version 2.6, to be removed in 3.0) bit field of thrown levels
     * @param bool          $replace Whether to replace or not any existing handler
     *
     * @return self The registered error handler
     */
    public static function register($handler = null, $replace = true)
    {
        if (null === self::$reservedMemory) {
            self::$reservedMemory = str_repeat('x', 10240);
            register_shutdown_function(__CLASS__.'::handleFatalError');
        }

        $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();
        }

        if (null === $prev = set_error_handler(array($handler, 'handleError'))) {
            restore_error_handler();
            // Specifying the error types earlier would expose us to https://bugs.php.net/63206
            set_error_handler(array($handler, 'handleError'), $handler->thrownErrors | $handler->loggedErrors);
            $handler->isRoot = true;
        }

        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 __construct(BufferingLogger $bootstrappingLogger = null)
    {
        if ($bootstrappingLogger) {
            $this->bootstrappingLogger = $bootstrappingLogger;
            $this->setDefaultLogger($bootstrappingLogger);
        }
    }

    /**
     * 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)
    {
        $loggers = array();

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

        $this->setLoggers($loggers);
    }

    /**
     * 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;
        $flush = array();

        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];

            if ($this->bootstrappingLogger && $prev[$type][0] === $this->bootstrappingLogger) {
                $flush[$type] = $type;
            }
        }
        $this->reRegister($prevLogged | $this->thrownErrors);

        if ($flush) {

            foreach ($this->bootstrappingLogger->cleanLogs() as $log) {
                $type = $log[2]['type'];
                if (!isset($flush[$type])) {
                    $this->bootstrappingLogger->log($log[0], $log[1], $log[2]);
                } elseif ($this->loggers[$type][0]) {
                    $this->loggers[$type][0]->log($this->loggers[$type][1], $log[1], $log[2]);
                }
            }
        }

        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 PHP error levels that throw an exception when a PHP error occurs.
     *
     * @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 version 2.6
        $this->displayErrors = $this->thrownErrors;


        return $prev;
    }

    /**
     * Sets the PHP error levels for which local variables are preserved.
     *
     * @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 PHP error levels for which the stack trace is preserved.
     *
     * @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) {
// Returns always int(0).
return 0 === $foo & 4;
return (0 === $foo) & 4;

// More likely intended return: true/false
return 0 === ($foo & 4);
            $handler = set_error_handler('var_dump');
            $handler = is_array($handler) ? $handler[0] : null;
            restore_error_handler();
            if ($handler === $this) {
                restore_error_handler();
                if ($this->isRoot) {
                    set_error_handler(array($this, 'handleError'), $this->thrownErrors | $this->loggedErrors);
                } else {
                    set_error_handler(array($this, 'handleError'));
                }
            }
        }
    }

    /**
     * Handles errors by filtering then logging them according to the configured bit fields.
     *
     * @param int    $type    One of the E_* constants
     * @param string $message
     * @param string $file
     * @param int    $line
     *
     * @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)
    {
        $level = error_reporting() | E_RECOVERABLE_ERROR | E_USER_ERROR | E_DEPRECATED | E_USER_DEPRECATED;
        $log = $this->loggedErrors & $type;
        $throw = $this->thrownErrors & $type & $level;
        $type &= $level | $this->screamedErrors;

        if (!$type || (!$log && !$throw)) {
            return $type && $log;
        }
        $scope = $this->scopedErrors & $type;

        if (4 < $numArgs = func_num_args()) {
            $context = $scope ? (func_get_arg(4) ?: array()) : array();
            $backtrace = 5 < $numArgs ? func_get_arg(5) : null; // defined on HHVM
        } else {
            $context = array();
            $backtrace = null;
        }

        if (isset($context['GLOBALS']) && $scope) {
            $e = $context;                  // Whatever the signature of the method,
            unset($e['GLOBALS'], $context); // $context is always a reference in 5.3
            $context = $e;
        }

        if (null !== $backtrace && $type & E_ERROR) {
            // E_ERROR fatal errors are triggered on HHVM when
            // hhvm.error_handling.call_user_handler_on_fatals=1
            // which is the way to get their backtrace.
            $this->handleFatalError(compact('type', 'message', 'file', 'line', 'backtrace'));

            return true;
        }

        if ($throw) {
            if (null !== self::$toStringException) {
                $throw = self::$toStringException;
                self::$toStringException = null;
            } elseif ($scope && 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();
            }

            if (E_USER_ERROR & $type) {
                $backtrace = $backtrace ?: $throw->getTrace();

                for ($i = 1; isset($backtrace[$i]); ++$i) {
                    if (isset($backtrace[$i]['function'], $backtrace[$i]['type'], $backtrace[$i - 1]['function'])
                        && '__toString' === $backtrace[$i]['function']
                        && '->' === $backtrace[$i]['type']
                        && !isset($backtrace[$i - 1]['class'])
                        && ('trigger_error' === $backtrace[$i - 1]['function'] || 'user_error' === $backtrace[$i - 1]['function'])
                    ) {
                        // Here, we know trigger_error() has been called from __toString().
                        // HHVM is fine with throwing from __toString() but PHP triggers a fatal error instead.
                        // A small convention allows working around the limitation:
                        // given a caught $e exception in __toString(), quitting the method with
                        // `return trigger_error($e, E_USER_ERROR);` allows this error handler
                        // to make $e get through the __toString() barrier.

                        foreach ($context as $e) {
                            if (($e instanceof \Exception || $e instanceof \Throwable) && $e->__toString() === $message) {
                                if (1 === $i) {
                                    // On HHVM
                                    $throw = $e;
                                    break;
                                }
                                self::$toStringException = $e;

                                return true;
                            }
                        }

                        if (1 < $i) {
                            // On PHP (not on HHVM), display the original error message instead of the default one.
                            $this->handleException($throw);

                            // Stop the process by giving back the error to the native handler.
                            return false;
                        }
                    }
                }
            }

            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 & $level) {
            if ($scope) {
                $e['scope_vars'] = $context;
                if ($trace) {
                    $e['stack'] = $backtrace ?: debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT);
                }
            } elseif ($trace) {
                if (null === $backtrace) {
                    $e['stack'] = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
                } else {
                    foreach ($backtrace as &$frame) {
                        unset($frame['args'], $frame);
                    }
                    $e['stack'] = $backtrace;
                }
            }
        }

        if ($this->isRecursive) {
            $log = 0;
        } elseif (self::$stackedErrorLevels) {

            self::$stackedErrors[] = array($this->loggers[$type][0], ($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
        } else {
            try {
                $this->isRecursive = true;
$answer = 42;

$correct = false;

$correct = (bool) $answer;
                $this->loggers[$type][0]->log(($type & $level) ? $this->loggers[$type][1] : LogLevel::DEBUG, $message, $e);
                $this->isRecursive = false;
$answer = 42;

$correct = false;

$correct = (bool) $answer;
            } catch (\Exception $e) {
                $this->isRecursive = false;

                throw $e;
            } catch (\Throwable $e) {
                $this->isRecursive = false;

                throw $e;
            }
        }

        return $type && $log;
    }

    /**
     * Handles an exception by logging then forwarding it to another handler.
     *
     * @param \Exception|\Throwable $exception An exception to handle
     * @param array                 $error     An array as returned by error_get_last()
     *
     * @internal
     */
    public function handleException($exception, array $error = null)
    {
        if (null === $error) {
            self::$exitCode = 255;
        }
        if (!$exception instanceof \Exception) {
            $exception = new FatalThrowableError($exception);
        }
        $type = $exception instanceof FatalErrorException ? $exception->getSeverity() : E_ERROR;

        if (($this->loggedErrors & $type) || $exception instanceof FatalThrowableError) {
            $e = array(
                'type' => $type,
                'file' => $exception->getFile(),
class A
{
    public function foo() { }
}

class B extends A
{
    public function bar() { }
}

/**
 * @param A|B $x
 */
function someFunction($x)
{
    $x->foo(); // This call is fine as the method exists in A and B.
    $x->bar(); // This method only exists in B and might cause an error.
}
                'line' => $exception->getLine(),
class A
{
    public function foo() { }
}

class B extends A
{
    public function bar() { }
}

/**
 * @param A|B $x
 */
function someFunction($x)
{
    $x->foo(); // This call is fine as the method exists in A and B.
    $x->bar(); // This method only exists in B and might cause an error.
}
                'level' => error_reporting(),
                'stack' => $exception->getTrace(),
class A
{
    public function foo() { }
}

class B extends A
{
    public function bar() { }
}

/**
 * @param A|B $x
 */
function someFunction($x)
{
    $x->foo(); // This call is fine as the method exists in A and B.
    $x->bar(); // This method only exists in B and might cause an error.
}
            );
            if ($exception instanceof FatalErrorException) {
                if ($exception instanceof FatalThrowableError) {
                    $error = array(
                        'type' => $type,
                        'message' => $message = $exception->getMessage(),
                        'file' => $e['file'],
                        'line' => $e['line'],
                    );
                } else {
                    $message = 'Fatal '.$exception->getMessage();
                }
            } elseif ($exception instanceof \ErrorException) {
if ($x instanceof DoesNotExist) {
    // Do something.
}
                $message = 'Uncaught '.$exception->getMessage();
                if ($exception instanceof ContextErrorException) {
                    $e['context'] = $exception->getContext();
                }
            } else {
                $message = 'Uncaught Exception: '.$exception->getMessage();
            }
        }
        if ($this->loggedErrors & $type) {
            try {
                $this->loggers[$type][0]->log($this->loggers[$type][1], $message, $e);
function myFunction($a) {
    switch ($a) {
        case 'foo':
            $x = 1;
            break;

        case 'bar':
            $x = 2;
            break;
    }

    // $x is potentially undefined here.
    echo $x;
}
            } catch (\Exception $handlerException) {

            } catch (\Throwable $handlerException) {

            }
        }
        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) {

        } catch (\Throwable $handlerException) {

        }
        if (isset($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 $error = null)
    {
        if (null === self::$reservedMemory) {
            return;
        }

        self::$reservedMemory = null;

        $handler = set_error_handler('var_dump');
        $handler = is_array($handler) ? $handler[0] : null;
        restore_error_handler();

        if (!$handler instanceof self) {
            return;
        }

        if ($exit = null === $error) {
            $error = error_get_last();
        }

        try {
            while (self::$stackedErrorLevels) {

                static::unstackErrors();
            }
        } catch (\Exception $exception) {
            // Handled below
        } catch (\Throwable $exception) {
            // Handled below
        }

        if ($error && $error['type'] &= E_PARSE | E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR) {

            // Let's not throw anymore but keep logging
            $handler->throwAt(0, true);
            $trace = isset($error['backtrace']) ? $error['backtrace'] : null;

            if (0 === strpos($error['message'], 'Allowed memory') || 0 === strpos($error['message'], 'Out of memory')) {
                $exception = new OutOfMemoryException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, false, $trace);
            } else {
                $exception = new FatalErrorException($handler->levels[$error['type']].': '.$error['message'], 0, $error['type'], $error['file'], $error['line'], 2, true, $trace);
            }
        }

        try {
            if (isset($exception)) {
                self::$exitCode = 255;
                $handler->handleException($exception, $error);
            }
        } catch (FatalErrorException $e) {
            // Ignore this re-throw
        }

        if ($exit && self::$exitCode) {
            $exitCode = self::$exitCode;
            register_shutdown_function('register_shutdown_function', function () use ($exitCode) { exit($exitCode); });
        }
    }

    /**
     * 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) {
                $e[0]->log($e[1], $e[2], $e[3]);
            }
        }
    }

    /**
     * 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 $level The level (null to use the error_reporting() value and 0 to disable)
     *
     * @deprecated since version 2.6, to be removed in 3.0. Use throwAt() instead.
     */
    public function setLevel($level)
    {
        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}

        $level = null === $level ? error_reporting() : $level;
        $this->throwAt($level, true);
    }

    /**
     * Sets the display_errors flag value.
     *
     * @param int $displayErrors The display_errors flag value
     *
     * @deprecated since version 2.6, to be removed in 3.0. Use throwAt() instead.
     */
    public function setDisplayErrors($displayErrors)
    {
        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the throwAt() method instead.', E_USER_DEPRECATED);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}

        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 version 2.6, to be removed in 3.0. Use setLoggers() or setDefaultLogger() instead.
     */
    public static function setLogger(LoggerInterface $logger, $channel = 'deprecation')
    {
        @trigger_error('The '.__METHOD__.' static method is deprecated since version 2.6 and will be removed in 3.0. Use the setLoggers() or setDefaultLogger() methods instead.', E_USER_DEPRECATED);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}

        $handler = set_error_handler('var_dump');
        $handler = is_array($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 version 2.6, to be removed in 3.0. Use handleError() instead.
     */
    public function handle($level, $message, $file = 'unknown', $line = 0, $context = array())
    {
        $this->handleError(E_USER_DEPRECATED, 'The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the handleError() method instead.', __FILE__, __LINE__, array());

        return $this->handleError($level, $message, $file, $line, (array) $context);
    }

    /**
     * Handles PHP fatal errors.
     *
     * @deprecated since version 2.6, to be removed in 3.0. Use handleFatalError() instead.
     */
    public function handleFatal()
    {
        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.6 and will be removed in 3.0. Use the handleFatalError() method instead.', E_USER_DEPRECATED);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}

        static::handleFatalError();
    }
}

/**
 * Private class used to work around https://bugs.php.net/54275.
 *
 * @author Nicolas Grekas <[email protected]>
 *
 * @internal
 */
class ErrorHandlerCanary
{
    private static $displayErrors = null;

    public function __construct()
    {
        if (null === self::$displayErrors) {
            self::$displayErrors = ini_set('display_errors', 1);
        }
    }

    public function __destruct()
    {
        if (null !== self::$displayErrors) {
            ini_set('display_errors', self::$displayErrors);
            self::$displayErrors = null;
        }
    }
}

Branch — master (f58c14)

ErrorHandler::handleException() F

Complexity

Size

Duplication

Importance

How to fix Long Method Complexity

Long Method

Available Fixes

Available Fixes

Available Fixes

1. Missing dependencies

2. Missing use statement

Available Fixes

Available Fixes

itstructure / yii2-template-multilanguage

Branch — master (f58c14)

ErrorHandler::handleException() F

Complexity

Size

Duplication

Importance

How to fix Long Method Complexity

Long Method

Available Fixes

Available Fixes

Available Fixes

1. Missing dependencies

2. Missing use statement

Available Fixes

Available Fixes

Duplication Side-by-Side

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