public static function hasContextDataByChildKey(string $key, string $child): bool
    {
        $coroutineId = self::getCoroutineId();
        return isset(self::$context[$coroutineId][self::DATA_KEY][$key][$child]);
    }
public static function hasContextDataByChildKey(string $key, string $child): bool
    {
        $coroutineId = self::getCoroutineId();
        return isset(self::$context[$coroutineId][self::DATA_KEY][$key][$child]);
    }
public static function hasContextDataByChildKey ( string $ key , string $ child ) : bool { $ coroutineId = self :: getCoroutineId ( ) ; return isset ( self :: $ context [ $ coroutineId ] [ self :: DATA_KEY ] [ $ key ] [ $ child ] ) ; }
has exists child key

@param string $key
@param string $child
@return bool
has exists child key