socket

<?php  
    class SocketServer{  
        private $socket; //socket资源句柄  
        private $userSocket = array(); //保存链接进来的套接字列表  
          
        private $writeSocket = array(); //保存链接进来的套接字列表  
        /** 
        *初始化 
        *@param String $host ip地址 
        *@param int $port 端口 
        *@param int $backlog 最大连接数 
        */  
        public function __construct($host = '127.0.0.1',$port = '9337', $backlog = 10)  
        {  
            $this -> socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die('socket创建失败'); //创建socket  
            socket_bind($this -> socket,$host,$port); //为socket绑定端口  
            socket_listen($this -> socket,$backlog); //监听socket套接字并设置链接数  可以不设置  
            $socketkey = $this -> generateRangNum();  
            $this->userSocket[$socketkey] = $this -> socket; //把套接字保存到数组中           
        }  
          
        /** 
        *启动woker实例 
        */  
        public function runStart() {  
              
            while(true) { //设置一个循环用来监听来自客户端的请求  
                $socketList = $this->userSocket; //把读的socket放到变量中  
                socket_select($socketList, $this->writeSocket , $except = null , null); //多路进行选择  
                  
                foreach ( $socketList as $socket ) {  
                      
                    if($this->socket == $socket) { //说明当前的服务器监听socket //就开始设置请求的函数  
                        $client = socket_accept($this->socket); //接收客户端的链接  
                        //添加客户端套接字  
                        $userkey    = $this->_addClient($client);    //把客户端的socket句柄添加到userSocket中  
                          
                        $data = array(  
                            'success' => 'Welcome',  
                            'info' => $userkey  
                        );  
                        $datajson = json_encode( $data );  
                          
                        socket_write($client,$datajson,strlen($datajson)); //触发链接后告诉客户端链接成功的信息  
                          
                        //$this->sendAll();  
                          
                    } else {   
                        $msg = @socket_read($socket,1024);//获取客户端发送来的信息  
                          
                        $msginfo = json_decode( $msg,true );  
                          
                        if ( $msginfo['type'] =='all' ) { //发送所有人  
                            $this->sendAll();  
                        } else {  
                            $this->sendToUser( $msginfo['userkey'],$msginfo['info'] );  
                        }  
                          
                          
                    }  
                      
                }  
            }  
              
        }  
          
          
        /** 
        *@param resource $client 客户端的套接字 
        */  
        private function _addClient($client) {  
            $socketkey = $this -> generateRangNum();  
            $this->userSocket[$socketkey] = $client;  
            return $socketkey;  
        }  
          
        //对单用户socket发送  
        public function sendToUser( $userkey,$info ) {  
              
            $socket = $this->userSocket[$userkey];  
              
            @socket_write($socket,$info,strlen( $info ));  
              
        }  
          
          
        //对所有socket发送  
        public function sendAll() {  
              
            $socketList = $this->userSocket;  
            foreach ($socketList as $socket) {  
                @socket_write($socket,'hai',strlen('hai'));  
            }  
        }  
          
        //生成唯一的key 用于单用户通信  
          
        public function generateRangNum() {  
            return md5(time() . mt_rand(1,1000000));  
        }  
          
    }  
      
    $s = new SocketServer();  
    $s -> runStart();