CFile::getInstance PHP Method

    public static function getInstance($filepath, $class_name = __CLASS__)
    {
        if ($class_name != __CLASS__ && !is_subclass_of($class_name, __CLASS__)) {
            throw new CFileException('Unable to spawn CFile object from `' . $class_name . '` class');
        }
        if (!array_key_exists($filepath, self::$_instances)) {
            self::$_instances[$filepath] = new $class_name($filepath);
        }
        return self::$_instances[$filepath];
    }

 public static function getInstance($filepath, $class_name = __CLASS__)
 {
     return parent::getInstance($filepath, __CLASS__);
 }