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1、socket服务器搭建思路

1) 目的：理解socket服务器工作机制

2) 思路：创建socket -> 把socket加入连接池 -> 处理接收信息 -> 握手动作 -> 发送信息

2、socket服务器代码

注：复制到php文件，直接命令行可以运行，不需要其他支持

特别注意：为了能传输中文_sendMsg做了json_encode()

<?php

/**
 * Socket服务器
 * @author wuchangliang 2018/1/17
 */
class SocketServer
{
    private $sockets; //连接池
    private $master;
    private $handshake;

    /**
     * @param $address
     * @param $port
     */
    public function run($address, $port)
    {
        //配置错误级别、运行时间、刷新缓冲区
        echo iconv('UTF-8', 'GBK', "欢迎来到PHP Socket测试服务。 \n");
        error_reporting(0);
        set_time_limit(0);
        ob_implicit_flush();

        //创建socket
        $this->master = $this->_connect($address, $port);
        $this->sockets[] = $this->master;

        //运行socket
        while (true) {
            $sockets = $this->sockets;
            $write = NULL;
            $except = NULL;
            socket_select($sockets, $write, $except, NULL); //$write,$except传引用
            foreach ($sockets as $socket) {
                if ($socket == $this->master) {
                    $client = socket_accept($socket);
                    $this->handshake = false;
                    if ($client) {
                        $this->sockets[] = $client; //加入连接池
                    }
                } else {
                    //接收信息
                    $bytes = @socket_recv($socket, $buffer, 2048, 0);
                    if ($bytes <= 6) {
                        $this->_disConnect($socket);
                        continue;
                    };

                    //处理信息
                    if (!$this->handshake) {
                        $this->_handshake($socket, $buffer);
                    } else {
                        $buffer = $this->_decode($buffer);
                        $this->_sendMsg($buffer, $socket);
                    }
                }

            }
        }
    }

    /**
     * 创建socket连接
     * @param $address
     * @param $port
     * @return resource
     */
    private function _connect($address, $port)
    {
        //创建socket
        $master = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)
        or die("socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n");
        socket_bind($master, $address, $port)
        or die("socket_bind() failed: reason: " . socket_strerror(socket_last_error($master)) . "\n");
        socket_listen($master, 5)
        or die("socket_listen() failed: reason: " . socket_strerror(socket_last_error($master)) . "\n");
        return $master;
    }

    /**
     * 握手动作
     * @param $socket
     * @param $buffer
     */
    private function _handshake($socket, $buffer)
    {
        //握手动作信息
        $buf = substr($buffer, strpos($buffer, 'Sec-WebSocket-Key:') + 18);
        $key = trim(substr($buf, 0, strpos($buf, "\r\n")));
        $new_key = base64_encode(sha1($key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true));
        $new_message = "HTTP/1.1 101 Switching Protocols\r\n";
        $new_message .= "Upgrade: websocket\r\n";
        $new_message .= "Sec-WebSocket-Version: 13\r\n";
        $new_message .= "Connection: Upgrade\r\n";
        $new_message .= "Sec-WebSocket-Accept: " . $new_key . "\r\n\r\n";

        //记录握手动作
        socket_write($socket, $new_message, strlen($new_message));
        $this->handshake = true;
    }

    /**
     * 断开socket连接
     * @param $socket
     */
    private function _disConnect($socket)
    {
        $index = array_search($socket, $this->sockets);
        socket_close($socket);
        if ($index >= 0) {
            array_splice($this->sockets, $index, 1);
        }
    }

    /**
     * 发送信息
     * @param $buffer
     * @param $client
     */
    private function _sendMsg($buffer, $client)
    {
        $send_buffer = $this->_frame(json_encode($buffer));
        foreach ($this->sockets as $socket) {
            if ($socket != $this->master && $socket != $client) { //广播发送（除了自己）
                socket_write($socket, $send_buffer, strlen($send_buffer));
            }
        }
    }

    /**
     * 解析数据帧
     * @param $buffer
     * @return null  
关键词：php下Socket服务器如何搭建并测试？（代码）