在workerman中建立udp服务，文档有问题

在workerman中建立udp服务很简单，类似如下代码

$udp_worker = new Worker('udp://127.0.0.1:9090');
$udp_worker->onMessage = function($connection, $data){
    var_dump($data);
    $connection->send('get');
};
Worker::runAll();