内容简介：PHP 用websocket实现客户端和服务器消息双向推送
PHP 实现websocket
html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>发送弹幕</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-1 col-sm-1 col-md-1 col-lg-1">
</div>
<div class="col-xs-10 col-sm-10 col-md-10 col-lg-10">
<div class="form-group">
<p style="height:30px"></p>
<div class="col-sm-2">
</div>
<div class="col-sm-4">
<input type="text" class="form-control" id="barrage" name="barrage" placeholder="弹幕" value="">
</div>
<div class="col-sm-4">
<button type="button" class="btn btn-primary" id="send">发送弹幕</button>
</div>
</div>
<!-- 弹幕内容 -->
<div class="form-group">
<p style="height:30px"></p>
<textarea class="form-control" rows="20" id="content"></textarea>
</div>
</div>
<div class="col-xs-1 col-sm-1 col-md-1 col-lg-1">
</div>
</div>
</div>
</body>
<script>
$(document).ready(function () {
var ws = new WebSocket("ws://127.0.0.1:9777");
ws.onopen = function () {
console.log("握手成功");
}
ws.onmessage = function (e) {
var content = e.data;
$('#content').append(content + "\n");
console.log(content);
}
ws.onerror = function () {
console.log("error");
}
$('#send').click(function (e) {
e.preventDefault();
var barrage = $('#barrage').val();
ws.send(barrage);
});
$('#barrage').bind('keypress', function (event) {
if (event.keyCode == "13") {
var barrage = $('#barrage').val();
ws.send(barrage);
}
});
});
</script>
</html>
PHP代码
<?php
class Socket
{
const BIND_NUM = 20;
private $master;
private $sockets = [];
private $handshake = false; // 握手
public function __construct($address, $port)
{
try {
// 创建
$this->master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// 参数
socket_set_option($this->master, SOL_SOCKET, SO_REUSEADDR, 1);
socket_set_nonblock($this->master);
// 绑定
socket_bind($this->master, $address, $port);
// 监听
socket_listen($this->master, static::BIND_NUM);
$this->sockets[] = $this->master;
$pid = posix_getpid();
// 输出
$this->say("Server Started : " . date('Y-m-d H:i:s'));
$this->say("Listening on : " . $address . " port " . $port);
$this->say("Pid : " . $pid);
$this->say("Master socket : " . $this->master . PHP_EOL);
} catch (\Exception $e) {
$this->error();
}
while (true) {
try {
// 慢点
usleep(200000);
$this->doServer();
} catch (\Exception $e) {
$this->error();
}
}
}
/**
* 开始服务
*/
public function doServer()
{
$write = $except = NULL;
socket_select($this->sockets, $write, $except, NULL); //自动选择来消息的socket 如果是握手 自动选择主机
foreach ($this->sockets as $socket) {
// 主机
if ($this->master == $socket) {
$client = socket_accept($this->master);
if ($client < 0) {
$this->notice("socket_accept() failed");
continue;
} else {
$this->connect($client);
}
} else {
// 非主机
$bytes = socket_recv($socket, $buffer, 2048, 0);
if ($bytes == 0) {
// 断开连接
$this->disConnect($socket);
} else {
if (!$this->handshake) {
// 准备握手
$this->doHandShake($socket, $buffer);
} else {
// 发送消息
$buffer = $this->decode($buffer);
$buffer='server say:'.$buffer;
$this->send($socket, $buffer);
}
}
}
}
}
/**
* 连接
*
* @param $socket
*/
public function connect($socket)
{
array_push($this->sockets, $socket);
$this->say("\n" . $socket . " CONNECTED!");
$this->say(date("Y-n-d H:i:s"));
}
/**
* 断开连接
*
* @param $socket
*/
public function disConnect($socket)
{
$index = array_search($socket, $this->sockets);
socket_close($socket);
$this->say($socket . " DISCONNECTED!");
if ($index >= 0) {
array_splice($this->sockets, $index, 1);
}
}
/**
* 握手
*
* @param $socket
* @param $buffer
* @return bool
*/
function doHandShake($socket, $buffer)
{
$this->say("\nRequesting handshake...");
$this->say($buffer);
$key = '';
if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/", $buffer, $match)) {
$key = $match[1];
}
$this->say("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
$this->say($upgrade);
socket_write($socket, $upgrade, strlen($upgrade));
$this->handshake = true;
$this->say($key);
$this->say("Done handshaking...");
return true;
}
/**
* 基于websocket version 13
*
* @param $key
* @return string
*/
function calcKey($key)
{
$accept = base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
return $accept;
}
/**
* 解密
*
* @param $buffer
* @return null|string
*/
function decode($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;
}
/**
* 发送消息
*
* @param $client
* @param $msg
*/
function send($client, $msg)
{
$this->say("> " . $msg);
$msg = $this->frame($msg);
socket_write($client, $msg, strlen($msg));
$this->say("! " . strlen($msg));
}
/**
* 数据帧
*
* @param $s
* @return string
*/
function frame($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;
}
/**
* 标准输出
*
* @param string $msg
*/
public function say($msg = "")
{
echo $msg . PHP_EOL;
}
/**
* 异常错误输出
*/
public function error()
{
$error = socket_last_error();
$error_msg = socket_strerror($error);
echo $error_msg . PHP_EOL;
}
/**
* 普通错误输出
*
* @param string $notice
*/
public function notice($notice = "")
{
echo $notice . PHP_EOL;
}
}
new Socket('127.0.0.1', 9777);
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