public static function has(array $storage, $key)
    {
        $keys	= explode('.', $key);

        foreach($keys as $key)
        {
            if(!isset($storage[$key]))
                return false;

            $storage	= $storage[$key];
        }

        return true;
    }
public static function has(array $storage, $key)
    {
        $keys	= explode('.', $key);

        foreach($keys as $key)
        {
            if(!isset($storage[$key]))
                return false;

            $storage	= $storage[$key];
        }

        return true;
    }
public static function has ( array $ storage , $ key ) { $ keys = explode ( '.' , $ key ) ; foreach ( $ keys as $ key ) { if ( ! isset ( $ storage [ $ key ] ) ) return false ; $ storage = $ storage [ $ key ] ; } return true ; }
Check key existence
@param array $storage
@param string $key
@return bool
Check key existence