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
以上就是详解php实现socket推送技术的详细内容。