public static function curlMultiExec($multiHandle, &$stillRunning)
    {
        if (isset(self::$multiHandles[(int) $multiHandle])) {
            foreach (self::$multiHandles[(int) $multiHandle] as $curlHandle) {
                if (!isset(self::$responses[(int) $curlHandle])) {
                    self::$multiExecLastChs[] = $curlHandle;
                    self::curlExec($curlHandle);
                }
            }
        }

        return CURLM_OK;
    }