Smarty::mutingErrorHandler PHP Method

    public static function mutingErrorHandler($errno, $errstr, $errfile, $errline, $errcontext)
    {
        $_is_muted_directory = false;
        // add the SMARTY_DIR to the list of muted directories
        if (!isset(Smarty::$_muted_directories[SMARTY_DIR])) {
            $smarty_dir = realpath(SMARTY_DIR);
            if ($smarty_dir !== false) {
                Smarty::$_muted_directories[SMARTY_DIR] = array('file' => $smarty_dir, 'length' => strlen($smarty_dir));
            }
        }
        // walk the muted directories and test against $errfile
        foreach (Smarty::$_muted_directories as $key => &$dir) {
            if (!$dir) {
                // resolve directory and length for speedy comparisons
                $file = realpath($key);
                if ($file === false) {
                    // this directory does not exist, remove and skip it
                    unset(Smarty::$_muted_directories[$key]);
                    continue;
                }
                $dir = array('file' => $file, 'length' => strlen($file));
            }
            if (!strncmp($errfile, $dir['file'], $dir['length'])) {
                $_is_muted_directory = true;
                break;
            }
        }
        // pass to next error handler if this error did not occur inside SMARTY_DIR
        // or the error was within smarty but masked to be ignored
        if (!$_is_muted_directory || $errno && $errno & error_reporting()) {
            if (Smarty::$_previous_error_handler) {
                return call_user_func(Smarty::$_previous_error_handler, $errno, $errstr, $errfile, $errline, $errcontext);
            } else {
                return false;
            }
        }
    }