看聊天室的代碼的時(shí)候有點(diǎn)疑惑：

// 創(chuàng)建一個(gè) 異步的tcp連接
// 請(qǐng)查看BusinessWorker::tryToConnectGateway方法
$gateway_connection  = new AsyncTcpConnection("GatewayProtocol://$addr");

// 然后發(fā)送一些數(shù)據(jù)

// 請(qǐng)查看BusinessWorker::tryToConnectGateway方法
$gateway_connection->send($gateway_data);
    $gateway_connection->connect();
}

由于AsyncTcpConnection的初始status狀態(tài)都是connecting狀態(tài)，所以send的時(shí)候都會(huì)先直接把buffer先存起來(lái)，然后直接return ，進(jìn)入到connect方法，connect方法則stream_socket_client連接服務(wù)端，同時(shí)將連接成功后的socket放入全局監(jiān)聽(tīng)中，等待Select::Loop, 。
問(wèn)題就是：
此時(shí)對(duì)于這條連接來(lái)說(shuō)，stream_select 什么時(shí)候才能監(jiān)聽(tīng)到？且剛剛send中沒(méi)有寫(xiě)入socket的數(shù)據(jù)是從哪里開(kāi)始寫(xiě)進(jìn)去的呢？
（新手，問(wèn)題若太簡(jiǎn)單，請(qǐng)勿噴。）
下面是 AsyncTcpConnection::$connect的代碼：

    public function connect()
    {
        // Open socket connection asynchronously.
        $this->_socket = stream_socket_client("tcp://{$this->_remoteAddress}", $errno, $errstr, 0,
            STREAM_CLIENT_ASYNC_CONNECT);
        // If failed attempt to emit onError callback.
        if (!$this->_socket) {
            $this->_status = self::STATUS_CLOSED;
            $this->emitError(WORKERMAN_CONNECT_FAIL, $errstr);
            return;
        }
        // Add socket to global event loop waiting connection is successfully established or faild.
        Worker::$globalEvent->add($this->_socket, EventInterface::EV_WRITE, array($this, 'checkConnection'));
    }