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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