WebSocket 长连接 及超时问题解决

<?php
set_time_limit(0);
class SocketService
{
    private $address  = 'localhost';
    private $port = 80;
    private $_sockets;
    public function __construct($address = '', $port='')
    {
        if(!empty($address)){
            $this->address = $address;
        }
        if(!empty($port)) {
            $this->port = $port;
        }
    }

    public function service(){
        //获取tcp协议号码。
        $tcp = getprotobyname("SOL_TCP");           # 获取与协议名称关联的协议号
        $sock = socket_create(AF_INET, SOCK_STREAM, $tcp);  # 创建一个套接字（通讯节点）
        socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1);  # 设置套接字选项
        if($sock < 0)
        {
            throw new Exception("failed to create socket: ".socket_strerror($sock)."\n");
        }
        socket_bind($sock, $this->address, $this->port);    # 绑定
        socket_listen($sock, $this->port);      # 监听套接字上的连接
        $this->_sockets = $sock;   
    }

    public function run(){
        $this->service();
        $clients[] = $this->_sockets;   # 数组存储 每个socket
        # 让服务器无限获取客户端传过来的信息
        while (true){
            $changes = $clients;
            $write = NULL;
            $except = NULL;
            socket_select($changes,  $write,  $except, NULL);
            foreach ($changes as $key => $_sock){
                if($this->_sockets == $_sock){  # 判断是不是新接入的socket
                    if(($newClient = socket_accept($_sock))  === false){    # 接受新的套接字上的连接   socket_accept的作用就是接受socket_bind()所绑定的主机发过来的套接流
                        die('failed to accept socket: '.socket_strerror($_sock)."\n");  # 返回描述套接字错误的字符串
                    }
                    $line = trim(socket_read($newClient, 1024));  # 读取客户端传过来的资源，并转化为字符串     socket_read的作用就是读出socket_accept()的资源并把它转化为字符串
                    $this->handshaking($newClient, $line);
                    //获取client ip
                    socket_getpeername ($newClient, $ip);                                   # 查询给定套接字的远程端，这可能导致主机/端口或UNIX文件系统路径，具体取决于其类型。
                    $clients[$ip] = $ne