详解php实现socket推送技术

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~

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服务端代码：

<?phpclass 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; $this->log("Done hand<span style="color:transparent">本文来源gaodai#ma#com搞*!代#%^码$网!</span><strong>搞代gaodaima码</strong>shaking..."); 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;

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