swoole如何实现局域网打洞？

首先是服务端，一定要位于公网上，我们以udp为例，其实tcp也是一样的，代码如下：

<?php
 
$arr = [];
 
 
$server = new Swoole\Server('0.0.0.0', 9503, SWOOLE_PROCESS, SWOOLE_SOCK_UDP);
$server->set([
    "worker_num" => 1
]);
$server->on('packet', function ($server, $data, $clientInfo) use (&$arr){
    $list = explode("\n", $data);
    foreach ($list as $value) {
        $data = json_decode($value, 1);
        if ($data) {
            if ($data["do"] == "reg") {
                $arr[$data["user"]] = $clientInfo;
                var_dump($arr);
                $server->sendTo($clientInfo['address'], $clientInfo['port'], "Server：");
//                $server->send($fd, "ok\n");
            } else if ($data["do"] == "get") {
                $server->sendTo($clientInfo['address'], $clientInfo['port'],
     ...

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