//服务器信息  
    $server = ‘udp://127.0.0.1:9998‘;  
    //消息结束符号  
    $msg_eof = "\n";  
    $socket = stream_socket_server($server, $errno, $errstr, STREAM_SERVER_BIND);  
    if (!$socket) {  
        die("$errstr ($errno)");  
    }  
      
    do {  
        //接收客户端发来的信息  
        $inMsg = stream_socket_recvfrom($socket, 1024, 0, $peer);  
        //服务端打印出相关信息  
        echo "Client : $peer\n";  
        echo "Receive : {$inMsg}";  
        //给客户端发送信息  
        $outMsg = substr($inMsg, 0, (strrpos($inMsg, $msg_eof))).‘ -- ‘.date("D M j H:i:s Y\r\n");  
        stream_socket_sendto($socket, $outMsg, 0, $peer);  
          
    } while ($inMsg !== false);  

function udpGet($sendMsg = ‘‘, $ip = ‘127.0.0.1‘, $port = ‘9998‘){
    $handle = stream_socket_client("udp://{$ip}:{$port}", $errno, $errstr);
    if( !$handle ){
        die("ERROR: {$errno} - {$errstr}\n");
    }
    fwrite($handle, $sendMsg."\n");
    $result = fread($handle, 1024);
    fclose($handle);
    return $result;
}
 
$result = udpGet(‘Hello World‘);
echo $result;