//如果$waitAckSec=0，则返回成功发送的字节�?

     //如果$waitAckSec大于0，则返回发送后接收到得内容

     //任何情况下，失败都返回FALSE

     function sendUdp($host, $port, $buff,$waitAckSec=0) {

         $socket = ($result = @socket_create(AF_INET,SOCK_DGRAM,SOL_UDP));

         //发送超时1秒

         socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,array("sec"=>3, "usec"=>0 ) );

         //接收超时6秒

         socket_set_option($socket,SOL_SOCKET,SO_SNDTIMEO,array("sec"=>6, "usec"=>0 ) );

         if($socket){

             $result = @socket_sendto($socket,$buff,strlen($buff),0,$host,$port);

             if($waitAckSec>0){

                 $result = FALSE;

                 $read = array($socket);

                 $write = NULL;

                 $except = NULL;

                 if(@socket_select($read,$write,$except,$waitAckSec)>0){

                     $fromHost = "";

                     $fromPort = 0;

                     @socket_recvfrom($socket,$result,4096,0,$fromHost,$fromPort);

                     $result = phpext_unpack($result);

                     if($result["needAck"] == 1){

                         $this->sendUdp($host, $port, $result["ackdata"]);

                         if(isset ($result['data']['list']) && isset ($result['data']['totalCount'])){

                             $list = $result['data']['list'];

                             $count = $result['data']['totalCount'];

                             while($count>  count($list)){

                                 @socket_recvfrom($socket,$result_temp,4096,0,$fromHost,$fromPort);

                                 $result_temp = phpext_unpack($result_temp);

                                 $this->sendUdp($host, $port, $result_temp["ackdata"]);

                                 $list = array_merge($list,$result_temp['data']['list']);

                             }

                             $result['data']['list'] = $list;

                         }

                     }else{

                         @socket_recvfrom($socket,$result,4096,0,$fromHost,$fromPort);

                         $result = phpext_unpack($result);

                         if($result["needAck"] == 1){

                             $this->sendUdp($host, $port, $result["ackdata"]);

                             if(isset ($result['data']['result']) && isset ($result['data']['userID'])){

                                 $list = $result['data']['list'];

                                 $count = $result['data']['totalCount'];

                                 while($count>  count($list)){

                                     @socket_recvfrom($socket,$result_temp,4096,0,$fromHost,$fromPort);

                                     $result_temp = phpext_unpack($result_temp);

                                     $this->sendUdp($host, $port, $result_temp["ackdata"]);

                                     $list = array_merge($list,$result_temp['data']['list']);

                                 }

                                 $result['data']['list'] = $list;

                             }

                         }

                     }

                 }else{

                     $result = SEND_UDP_ERROR;

                 }

             }

             @socket_close($socket);

         }

         return $result;

     }