<"start \n";
  }
 
  //有客户端连接时
  public function connect($serv, $fd) {
    echo "connect \n";
    $serv->send($fd, "hello \n");
  }
 
  public function close($serv, $fd) {
    echo "close \n";
  }
 
  public function receive($serv, $fd, $from_id, $data) {
    echo "get message {$fd} : {$data} \n";
    //向客户端发送信息
    $serv->send($fd, $data . "\n");
  }
}
 
$serv = new EchoServer();

<"connect \n";
  }
 
  public function receive($client, $data) {
    echo "server send: {$data}";
 
    //向标准输出写入数据
    fwrite(STDOUT, "请输入消息：");
    //获取标准输入数据
    $msg = trim(fgets(STDIN));
    //向服务端发送数据
    $client->send($msg);
  }
 
  public function close($client) {
    echo "close \n";
  }
 
  public function error($client) {
    echo "error \n";
  }
}
 
$cli = new EchoClient();

> /data/php56/bin/php server.php
> /data/php56/bin/php client.php