html5 - 本质就是websocket的客户端，php Websocket 怎么接收数据

<code>class WebsocketClient
{

    private $_Socket = null;

    public function __construct($host, $port)
    {
        $this->_connect($host, $port);
    }

    public function __destruct()
    {
        $this->_disconnect();
    }

    public function sendData($data)
    {
        // send actual data:
        return fwrite($this->_Socket, $this->encode($data)) or die('Error:' . $errno . ':' . $errstr);

        $wsData = fread($this->_Socket, 2000);
        $retData = trim($wsData, chr(0) . chr(255));

        return $retData;
    }

    private function encode($data)
    {
        $data = is_array($data) || is_object($data) ? json_encode($data) : (string)$data;
        $len = strlen($data);
        $mask = array();
        for ($j = 0; $j  127)
            {
                return false;
            }
        }
        $head[1] += 128;
        $head = array_merge($head, $mask);
        foreach ($head as $k => $v)
        {
            $head[$k] = chr($v);
        }
        $mask_data = '';
        for ($j = 0; $j _generateRandomString(32);
        $key2 = $this->_generateRandomString(32);
        $key3 = $this->_generateRandomString(8, false, true);
        $header = "GET ws://" . $host . ":" . $port . "/ HTTP/1.1\r\n";
        $header .= "Host: " . $host . ":" . $port . "\r\n";
        $header .= "Connection: Upgrade\r\n";
        $header .= "Pragma: no-cache\r\n";
        $header .= "Cache-Control: no-cache\r\n";
        $header .= "Upgrade: websocket\r\n";
        $header .= "Sec-WebSocket-Version: 13\r\n";
        $header .= "User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36\r\n";
        $header .= "Accept-Encoding: gzip, deflate, sdch\r\n";
        $header .= "Accept-Language: zh-CN,zh;q=0.8\r\n";
        $header .= "Sec-WebSocket-Key: " . $key1 . "\r\n";
        $header .= "Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n";
        $header .= "\r\n";
        $this->_Socket = fsockopen($host, $port, $errno, $errstr, 2);
        fwrite($this->_Socket, $header) or die('Error: ' . $errno . ':' . $errstr);
        $response = fread($this->_Socket, 2000);

        /**
         * @todo: check response here. Currently not implemented cause "2 key handshake" is already deprecated.
         * See: http://en.wikipedia.org/wiki/WebSocket#WebSocket_Protocol_Handshake
         */
        return true;
    }

    private function _disconnect()
    {
        fclose($this->_Socket);
    }

    private function _generateRandomString($length = 10, $addSpaces = true, $addNumbers = true)
    {
        $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"§$%&/()=[]{}';
        $useChars = array();
        // select some random chars:
        for ($i = 0; $i </code>

<code>class WebsocketClient
{

    private $_Socket = null;

    public function __construct($host, $port)
    {
        $this->_connect($host, $port);
    }

    public function __destruct()
    {
        $this->_disconnect();
    }

    public function sendData($data)
    {
        // send actual data:
        return fwrite($this->_Socket, $this->encode($data)) or die('Error:' . $errno . ':' . $errstr);

        $wsData = fread($this->_Socket, 2000);
        $retData = trim($wsData, chr(0) . chr(255));

        return $retData;
    }

    private function encode($data)
    {
        $data = is_array($data) || is_object($data) ? json_encode($data) : (string)$data;
        $len = strlen($data);
        $mask = array();
        for ($j = 0; $j  127)
            {
                return false;
            }
        }
        $head[1] += 128;
        $head = array_merge($head, $mask);
        foreach ($head as $k => $v)
        {
            $head[$k] = chr($v);
        }
        $mask_data = '';
        for ($j = 0; $j _generateRandomString(32);
        $key2 = $this->_generateRandomString(32);
        $key3 = $this->_generateRandomString(8, false, true);
        $header = "GET ws://" . $host . ":" . $port . "/ HTTP/1.1\r\n";
        $header .= "Host: " . $host . ":" . $port . "\r\n";
        $header .= "Connection: Upgrade\r\n";
        $header .= "Pragma: no-cache\r\n";
        $header .= "Cache-Control: no-cache\r\n";
        $header .= "Upgrade: websocket\r\n";
        $header .= "Sec-WebSocket-Version: 13\r\n";
        $header .= "User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36\r\n";
        $header .= "Accept-Encoding: gzip, deflate, sdch\r\n";
        $header .= "Accept-Language: zh-CN,zh;q=0.8\r\n";
        $header .= "Sec-WebSocket-Key: " . $key1 . "\r\n";
        $header .= "Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n";
        $header .= "\r\n";
        $this->_Socket = fsockopen($host, $port, $errno, $errstr, 2);
        fwrite($this->_Socket, $header) or die('Error: ' . $errno . ':' . $errstr);
        $response = fread($this->_Socket, 2000);

        /**
         * @todo: check response here. Currently not implemented cause "2 key handshake" is already deprecated.
         * See: http://en.wikipedia.org/wiki/WebSocket#WebSocket_Protocol_Handshake
         */
        return true;
    }

    private function _disconnect()
    {
        fclose($this->_Socket);
    }

    private function _generateRandomString($length = 10, $addSpaces = true, $addNumbers = true)
    {
        $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"§$%&/()=[]{}';
        $useChars = array();
        // select some random chars:
        for ($i = 0; $i </code>