在socket出现之前已经有ajax定时请求、长轮询等方案，但都不能满足某些特定情况下的需求，基于此，socket就应运而生了。
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
服务端代码socket.php(名字自己定义)：
<?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);
$msg = $this->frame('恭喜你，成功了');
socket_write($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index.html（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>
然后到socket.php所在的目录执行php socket.php 开启socket（直接使用php命令要添加环境变量）,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。
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