How to implement websocket in php

Guanhui
Release: 2023-03-01 07:24:01
Original
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How to implement websocket in php

How to implement websocket in php

First create the socket service in the php code and listen to the port information;

//传相应的IP与端口进行创建socket操作
function WebSocket($address,$port){
    $server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
    socket_set_option($server, SOL_SOCKET, SO_REUSEADDR, 1);//1表示接受所有的数据包
    socket_bind($server, $address, $port);
    socket_listen($server);
    return $server;
}
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Then design A loop hangs the websocket channel to receive, process and send data;

//对创建的socket循环进行监听,处理数据
function run(){
    //死循环,直到socket断开
    while(true){
        $changes=$this->sockets;
        $write=NULL;
        $except=NULL;
         
        /*
        //这个函数是同时接受多个连接的关键,我的理解它是为了阻塞程序继续往下执行。
        socket_select ($sockets, $write = NULL, $except = NULL, NULL);
 
        $sockets可以理解为一个数组,这个数组中存放的是文件描述符。当它有变化(就是有新消息到或者有客户端连接/断开)时,socket_select函数才会返回,继续往下执行。
        $write是监听是否有客户端写数据,传入NULL是不关心是否有写变化。
        $except是$sockets里面要被排除的元素,传入NULL是”监听”全部。
        最后一个参数是超时时间
        如果为0:则立即结束
        如果为n>1: 则最多在n秒后结束,如遇某一个连接有新动态,则提前返回
        如果为null:如遇某一个连接有新动态,则返回
        */
        socket_select($changes,$write,$except,NULL);
        foreach($changes as $sock){
             
            //如果有新的client连接进来,则
            if($sock==$this->master){
 
                //接受一个socket连接
                $client=socket_accept($this->master);
 
                //给新连接进来的socket一个唯一的ID
                $key=uniqid();
                $this->sockets[]=$client;  //将新连接进来的socket存进连接池
                $this->users[$key]=array(
                    'socket'=>$client,  //记录新连接进来client的socket信息
                    'shou'=>false       //标志该socket资源没有完成握手
                );
            //否则1.为client断开socket连接,2.client发送信息
            }else{
                $len=0;
                $buffer='';
                //读取该socket的信息,注意:第二个参数是引用传参即接收数据,第三个参数是接收数据的长度
                do{
                    $l=socket_recv($sock,$buf,1000,0);
                    $len+=$l;
                    $buffer.=$buf;
                }while($l==1000);
 
                //根据socket在user池里面查找相应的$k,即健ID
                $k=$this->search($sock);
 
                //如果接收的信息长度小于7,则该client的socket为断开连接
                if($len<7){
                    //给该client的socket进行断开操作,并在$this->sockets和$this->users里面进行删除
                    $this->send2($k);
                    continue;
                }
                //判断该socket是否已经握手
                if(!$this->users[$k]['shou']){
                    //如果没有握手,则进行握手处理
                    $this->woshou($k,$buffer);
                }else{
                    //走到这里就是该client发送信息了,对接受到的信息进行uncode处理
                    $buffer = $this->uncode($buffer,$k);
                    if($buffer==false){
                        continue;
                    }
                    //如果不为空,则进行消息推送操作
                    $this->send($k,$buffer);
                }
            }
        }
         
    }
     
}
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Finally wait for the client to connect.

var ws = new WebSocket("ws://IP:端口");
//握手监听函数
ws.onopen=function(){
     //状态为1证明握手成功,然后把client自定义的名字发送过去
    if(so.readyState==1){
         //握手成功后对服务器发送信息
     so.send('type=add&ming='+n);
    }
}
//错误返回信息函数
ws.onerror = function(){
    console.log("error");
};
//监听服务器端推送的消息
ws.onmessage = function (msg){
    console.log(msg);
}
 
//断开WebSocket连接
ws.onclose = function(){
    ws = false;
}
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Recommended tutorials: "PHP Tutorial" "PHP7"

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