private static function _checkLoaded()
    {
        $cls = get_called_class();
        if (!array_key_exists($cls, self::$_loaded)) {
            self::$_loaded[$cls] = false;
        }
        if (!self::$_loaded[$cls]) {
            self::_loadColumns();
        }
    }
private static function _checkLoaded()
    {
        $cls = get_called_class();
        if (!array_key_exists($cls, self::$_loaded)) {
            self::$_loaded[$cls] = false;
        }
        if (!self::$_loaded[$cls]) {
            self::_loadColumns();
        }
    }
private static function _checkLoaded ( ) { $ cls = get_called_class ( ) ; if ( ! array_key_exists ( $ cls , self :: $ _loaded ) ) { self :: $ _loaded [ $ cls ] = false ; } if ( ! self :: $ _loaded [ $ cls ] ) { self :: _loadColumns ( ) ; } }
Check if the object columns were loaded

@return boolean loaded or not
Check if the object columns were loaded