PHP MWExceptionHandler::reservedMemory方法代码示例

    /**
     * Look for a fatal error as the cause of the request termination and log
     * as an exception.
     *
     * Special handling is included for missing class errors as they may
     * indicate that the user needs to install 3rd-party libraries via
     * Composer or other means.
     *
     * @since 1.25
     */
    public static function handleFatalError()
    {
        self::$reservedMemory = null;
        $lastError = error_get_last();
        if ($lastError && isset($lastError['type']) && in_array($lastError['type'], self::$fatalErrorTypes)) {
            $msg = "Fatal Error: {$lastError['message']}";
            // HHVM: Class undefined: foo
            // PHP5: Class 'foo' not found
            if (preg_match("/Class (undefined: \\w+|'\\w+' not found)/", $lastError['message'])) {
                // @codingStandardsIgnoreStart Generic.Files.LineLength.TooLong
                $msg = <<<TXT
{$msg}

MediaWiki or an installed extension requires this class but it is not embedded directly in MediaWiki's git repository and must be installed separately by the end user.

Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">mediawiki.org</a> for help on installing the required components.
TXT;
                // @codingStandardsIgnoreEnd
            }
            $e = new ErrorException($msg, 0, $lastError['type']);
            self::logError($e, 'fatal');
        }
    }

    /**
     * Dual purpose callback used as both a set_error_handler() callback and
     * a registered shutdown function. Receive a callback from the interpreter
     * for a raised error or system shutdown, check for a fatal error, and log
     * to the 'fatal' logging channel.
     *
     * Special handling is included for missing class errors as they may
     * indicate that the user needs to install 3rd-party libraries via
     * Composer or other means.
     *
     * @since 1.25
     *
     * @param int $level Error level raised
     * @param string $message Error message
     * @param string $file File that error was raised in
     * @param int $line Line number error was raised at
     * @param array $context Active symbol table point of error
     * @param array $trace Backtrace at point of error (undocumented HHVM
     *     feature)
     * @return bool Always returns false
     */
    public static function handleFatalError($level = null, $message = null, $file = null, $line = null, $context = null, $trace = null)
    {
        // Free reserved memory so that we have space to process OOM
        // errors
        self::$reservedMemory = null;
        if ($level === null) {
            // Called as a shutdown handler, get data from error_get_last()
            if (static::$handledFatalCallback) {
                // Already called once (probably as an error handler callback
                // under HHVM) so don't log again.
                return false;
            }
            $lastError = error_get_last();
            if ($lastError !== null) {
                $level = $lastError['type'];
                $message = $lastError['message'];
                $file = $lastError['file'];
                $line = $lastError['line'];
            } else {
                $level = 0;
                $message = '';
            }
        }
        if (!in_array($level, self::$fatalErrorTypes)) {
            // Only interested in fatal errors, others should have been
            // handled by MWExceptionHandler::handleError
            return false;
        }
        $msg = "[{exception_id}] PHP Fatal Error: {$message}";
        // Look at message to see if this is a class not found failure
        // HHVM: Class undefined: foo
        // PHP5: Class 'foo' not found
        if (preg_match("/Class (undefined: \\w+|'\\w+' not found)/", $msg)) {
            // @codingStandardsIgnoreStart Generic.Files.LineLength.TooLong
            $msg = <<<TXT
{$msg}

MediaWiki or an installed extension requires this class but it is not embedded directly in MediaWiki's git repository and must be installed separately by the end user.

Please see <a href="https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries">mediawiki.org</a> for help on installing the required components.
TXT;
            // @codingStandardsIgnoreEnd
        }
        // We can't just create an exception and log it as it is likely that
        // the interpreter has unwound the stack already. If that is true the
        // stacktrace we would get would be functionally empty. If however we
        // have been called as an error handler callback *and* HHVM is in use
        // we will have been provided with a useful stacktrace that we can
        // log.
        $trace = $trace ?: debug_backtrace();
        $logger = LoggerFactory::getInstance('fatal');
        $logger->error($msg, ['exception' => ['class' => 'ErrorException', 'message' => "PHP Fatal Error: {$message}", 'code' => $level, 'file' => $file, 'line' => $line, 'trace' => static::redactTrace($trace)], 'exception_id' => wfRandomString(8)]);
        // Remember call so we don't double process via HHVM's fatal
        // notifications and the shutdown hook behavior
        static::$handledFatalCallback = true;
        return false;
    }