Smarty::muteExpectedErrors PHP Method

    public static function muteExpectedErrors()
    {
        /*
            error muting is done because some people implemented custom error_handlers using
            http://php.net/set_error_handler and for some reason did not understand the following paragraph:
        
                It is important to remember that the standard PHP error handler is completely bypassed for the
                error types specified by error_types unless the callback function returns FALSE.
                error_reporting() settings will have no effect and your error handler will be called regardless -
                however you are still able to read the current value of error_reporting and act appropriately.
                Of particular note is that this value will be 0 if the statement that caused the error was
                prepended by the @ error-control operator.
        
            Smarty deliberately uses @filemtime() over file_exists() and filemtime() in some places. Reasons include
                - @filemtime() is almost twice as fast as using an additional file_exists()
                - between file_exists() and filemtime() a possible race condition is opened,
                  which does not exist using the simple @filemtime() approach.
        */
        $error_handler = array('Smarty', 'mutingErrorHandler');
        $previous = set_error_handler($error_handler);
        // avoid dead loops
        if ($previous !== $error_handler) {
            Smarty::$_previous_error_handler = $previous;
        }
    }

 /**
  * Initialise Twig
  *
  * @return void
  */
 protected function initTemplateEngine()
 {
     $this->loader = new \Smarty();
     $this->loader->muteExpectedErrors();
     $this->loader->setTemplateDir($this->getTemplateDir());
     $this->loader->addPluginsDir(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'SmartyPlugins');
     $this->initSmartyCache();
     Logger::debug("Smarty Cache: " . $this->loader->getCacheDir());
 }