protected static function _checkData($plugin)
    {
        return (Arr::in($plugin, self::$_data)) ? self::$_data[$plugin] : [];
    }
protected static function _checkData($plugin)
    {
        return (Arr::in($plugin, self::$_data)) ? self::$_data[$plugin] : [];
    }
protected static function _checkData ( $ plugin ) { return ( Arr :: in ( $ plugin , self :: $ _data ) ) ? self :: $ _data [ $ plugin ] : [ ] ; }
Check plugin data.

@param string $plugin
@return array
Check plugin data .