php websocket Demo

最新推荐文章于 2025-10-14 11:27:11 发布

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本文介绍如何使用PHP搭建WebSocket服务端，并通过HTML客户端实现与服务器的实时双向通信。涵盖服务端握手、消息收发及客户端UI交互。

1、新建客户端client.html

<html>
    <meta>
        <meta http-equiv=Content-Type content="text/html;charset=utf-8">
    </head>
    <body>
        <h3>WebSocket协议的客户端程序</h3>
        <button id="btConnect">连接到WS服务器</button>
        <button id="btSendAndReceive">向WS服务器发消息并接收消息</button>
        <button id="btClose">断开与WS服务器的连接</button>
        <div id="val"></div>
    </body>
    <script>
        var wsClient = null; // WS客户端对象
        btConnect.onclick = function(){
            //连接到WS服务器，注意：协议名不是http！
            wsClient = new WebSocket('ws://127.0.0.1:8000');
            wsClient.onopen = function(){
                console.log('WS客户端已经成功连接到服务器上')
            }
        }
        btSendAndReceive.onclick = function(){
            //向WS服务器发送一个消息
            wsClient.send('Hello Server');
            //接收WS服务器返回的消息
            wsClient.onmessage = function(e){
                console.log('WS客户端接收到一个服务器的消息：'+ e.data);
                val.innerHTML=e.data;
            }
        }
        btClose.onclick = function(){
            //断开到WS服务器的连接
            wsClient.close();  //向服务器发消息，主动断开连接
            wsClient.onclose = function(){
                //经过客户端和服务器的四次挥手后，二者的连接断开了
                console.log('到服务器的连接已经断开')
            }
        }
    </script>
</html>

2、新建服务端

<?php
class websocket{
    public function __construct($address,$port)
    {
        //建立套接字
        $this->soc=$this->createSocket($address,$port);
        $this->socs=array($this->soc);
        $this->run();
    }

    // 建立套接字
    public function createSocket($address,$port)
    {
        //创建一个套接字
        $socket= socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        //设置套接字选项
        socket_set_block($socket);
        socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);
        //绑定IP地址和端口
        socket_bind($socket,$address,$port);
        //监听套接字
        socket_listen($socket, 4);
        return $socket;
    }

    public function run(){
        // 挂起进程
        $sock = $this->soc;
        while(true){
            echo "Waiting for Connection...\n";
            $msgsock = socket_accept($sock);        // 返回有效的套接字
            echo "Waiting for Request...\n";
            $buf = socket_read($msgsock, 8192);     // 读取请求
            echo "Request Received: $buf\n";
            $response = $this->hand_shake($buf);
            socket_write($msgsock,$response,strlen($response)); // 发送响应，让客户端知道连接成功；

            //正式开始通信...
            $buf = socket_read($msgsock, 8192);

            for($i=0; $i<3; $i++){
                $msg = "WELCOME $i\n";
                $msg = $this->code($msg);
                sleep(1);
                socket_write($msgsock, $msg, strlen($msg)); // 发送消息到客户端
            }
            socket_close($msgsock);
        }
        socket_close($sock);
    }

    /**
     * 套接字握手，可以不用管
     * @param $buf
     * @return string
     */
    public function hand_shake($buf){
        $buf  = substr($buf,strpos($buf,'Sec-WebSocket-Key:')+18);
        $key  = trim(substr($buf,0,strpos($buf,"\r\n")));

        $new_key = base64_encode(sha1($key."258EAFA5-E914-47DA-95CA-C5AB0DC85B11",true));

        $new_message = "HTTP/1.1 101 Switching Protocols\r\n";
        $new_message .= "Upgrade: websocket\r\n";
        $new_message .= "Sec-WebSocket-Version: 13\r\n";
        $new_message .= "Connection: Upgrade\r\n";
        $new_message .= "Sec-WebSocket-Accept: " . $new_key . "\r\n\r\n";
        return $new_message;
    }
    public function code($msg){
        $msg = preg_replace(array('/\r$/','/\n$/','/\r\n$/',), '', $msg);
        $frame = array();
        $frame[0] = '81';
        $len = strlen($msg);
        $frame[1] = $len<16?'0'.dechex($len):dechex($len);
        $frame[2] = $this->ord_hex($msg);
        $data = implode('',$frame);
        return pack("H*", $data);
    }
    public function ord_hex($data)  {
        $msg = '';
        $l = strlen($data);
        for ($i= 0; $i<$l; $i++) {
            $msg .= dechex(ord($data{$i}));
        }
        return $msg;
    }
}

// 调用
$address = '127.0.0.1';
$port    = 8000;
$server  = new websocket( $address, $port );

3、Windows的话，自己配置好php环境；下面执行命令php server.php运行服务端脚本。