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详解php实现socket推送技术

时间:2021-07-01 10:21:17 帮助过:56人阅读

在socket出现之前已经有ajax定时请求、长轮询等方案,但都不能满足需求,socket就应用而生了。本文就为大家分享一篇php实现socket推送技术的示例,具有很好的参考价值,希望对大家有所帮助。一起跟随小编过来看看吧,希望能帮助到大家。

socket基本函数socket

总结下常用的socket函数

服务端: socket_create 创建socket设置基本参数

     socket_bind 绑定ip和端口号

     socket_listen 监听

     socket_accept 客户端的连接

     socket_read 读取客户端的数据

     socket_write 给单独客户端发送数据

     socket_close 关闭连接

客户端:socket_create 创建socket设置基本参数

     socket_connect 连接socket

     socket_write 给服务端发送数据

     socket_read 读取服务端数据

     socket_close 关闭连接

H5websocket不多说了,上链接

OK,开始贴代码~

----------------------------------------------------------分割线

服务端代码:

<?php
class WS {
 var $master;
 var $sockets = array();
 var $debug = false;//true为调试模式,
输出log日志 var $handshake = array(); function __construct($address, $port){ $this->master=socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("socket_create() failed"); socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1) or die("socket_option() failed"); socket_bind($this->master, $address, $port) or die("socket_bind() failed"); socket_listen($this->master,20) or die("socket_listen() failed"); $this->sockets[] = $this->master; $this->say("Server Started : ".date('Y-m-d H:i:s')); $this->say("Listening on : ".$address." port ".$port); $this->say("Master socket : ".$this->master."\n"); while(true){ $socketArr = $this->sockets; $write = NULL; $except = NULL; socket_select($socketArr, $write, $except, NULL); //自动选择来消息的socket 如果是握手 自动选择主机 foreach ($socketArr as $socket){ if ($socket == $this->master){ //主机 $client = socket_accept($this->master); if ($client < 0){ $this->log("socket_accept() failed"); continue; } else{ $this->connect($client); } } else { $bytes = @socket_recv($socket,$buffer,2048,0); if ($bytes == 0){ $this->disConnect($socket); } else{ $key = array_search($socket, $this->sockets); if (empty($this->handshake) || !isset($this->handshake[$key]) || !$this->handshake[$key]){ $this->doHandShake($socket, $buffer, $key); } else{ $buffer = $this->decode($buffer); echo $buffer.PHP_EOL; $key = array_search($socket, $this->sockets); $arr = $this->sockets; array_shift($arr); foreach ($arr as $s){ $this->send($s, $buffer); } } } } } } } function send($client, $msg){ $msg = $this->frame($msg); socket_write($client, $msg, strlen($msg)); } function connect($socket){ array_push($this->sockets, $socket); $this->say("\n" . $socket . " CONNECTED!"); $this->say(date("Y-n-d H:i:s")); } function disConnect($socket){ $index = array_search($socket, $this->sockets); socket_close($socket); $this->say($socket . " DISCONNECTED!"); if ($index >= 0){ echo 'unset index is:'.PHP_EOL; unset($this->sockets[$index]); } } function doHandShake($socket, $buffer, $handKey){ $this->log("\nRequesting handshake..."); $this->log($buffer); list($resource, $host, $origin, $key) = $this->getHeaders($buffer); $this->log("Handshaking..."); $upgrade = "HTTP/1.1 101 Switching Protocol\r\n" . "Upgrade: websocket\r\n" . "Connection: Upgrade\r\n" . "Sec-WebSocket-Accept: " . $this->calcKey($key) . "\r\n\r\n"; //必须以两个回车结尾 $this->log($upgrade); $sent = socket_write($socket, $upgrade, strlen($upgrade)); $this->handshake[$handKey]=true; $this->log("Done handshaking..."); return true; } function getHeaders($req){ $r = $h = $o = $key = null; if (preg_match("/GET (.*) HTTP/" ,$req,$match)) { $r = $match[1]; } if (preg_match("/Host: (.*)\r\n/" ,$req,$match)) { $h = $match[1]; } if (preg_match("/Origin: (.*)\r\n/" ,$req,$match)) { $o = $match[1]; } if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/",$req,$match)) { $key = $match[1]; } return array($r, $h, $o, $key); } function calcKey($key){ //基于websocket version 13 $accept = base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true)); return $accept; } function decode($buffer) { $len = $masks = $data = $decoded = null; $len = ord($buffer[1]) & 127; if ($len === 126) { $masks = substr($buffer, 4, 4); $data = substr($buffer, 8); } else if ($len === 127) { $masks = substr($buffer, 10, 4); $data = substr($buffer, 14); } else { $masks = substr($buffer, 2, 4); $data = substr($buffer, 6); } for ($index = 0; $index < strlen($data); $index++) { $decoded .= $data[$index] ^ $masks[$index % 4]; } return $decoded; } function frame($s){ $a = str_split($s, 125); if (count($a) == 1){ return "\x81" . chr(strlen($a[0])) . $a[0]; } $ns = ""; foreach ($a as $o){ $ns .= "\x81" . chr(strlen($o)) . $o; } return $ns; } function say($msg = ""){ echo $msg . "\n"; } function log($msg = ""){ if ($this->debug){ echo $msg . "\n"; } } } new WS('localhost', 4000);

客户端代码(H5):

<html>
 <head>
 <title>demo</title>
 <script src="https://cdn.bootcss.com/jquery/1.9.1/jquery.min.js"></script>
 </head>
 <body>
 <input type="text" id="content">
 <input type="button" value="send" id="send">
 <script type="text/javascript">
  var ws = new WebSocket("ws://localhost:4000");
  ws.onopen = function(){
  console.log("握手成功");
  }
  ws.onmessage = function(e){
  console.log("message:" + e.data);
  }
  ws.onerror = function(){
  console.log("error");
  }
  $("#send").click(function(){
  content = $("#content").val();
  console.log(content);
  ws.send(content);
  })
 </script>
 </body>
</html>

然后执行php demo.php 开启socket(从运维那偷学一招,linux下执行nohup php demo.php &可以在后台执行),浏览器打开多个index.html,就能建立通讯了。

代码解析:

1.属性$sockets数组保存每个accept连接(不知道这么描述对不对);

2.属性$handshake数组保存连接是否在连接状态;

相关推荐:

PHP socket 服务器框架workerman

php中关于websocket的详细介绍

python中socket模块详解

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