<?php
$server = new Swoole\Server('127.0.0.1', 9502, SWOOLE_PROCESS, SWOOLE_SOCK_UDP);

$server->on('Packet', function ($server, $data, $clientInfo) {
    var_dump($clientInfo);
    $server->sendto($clientInfo['address'], $clientInfo['port'], "Server: {$data}");
});

$server->start();