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; }
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); } } } } }
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; }
Recommended tutorials: "PHP Tutorial" "PHP7"
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