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                # 創建UDP服務器 程序代碼 ----- udp_server.php ```php //創建Server對象,監聽 127.0.0.1:9502端口,類型為SWOOLE_SOCK_UDP $serv = new swoole_server("127.0.0.1", 9502, SWOOLE_PROCESS, SWOOLE_SOCK_UDP); //監聽數據接收事件 $serv->on('Packet', function ($serv, $data, $clientInfo) { $serv->sendto($clientInfo['address'], $clientInfo['port'], "Server ".$data); var_dump($clientInfo); }); //啟動服務器 $serv->start(); ``` UDP服務器與TCP服務器不同,UDP沒有連接的概念。啟動Server后,客戶端無需Connect,直接可以向Server監聽的9502端口發送數據包。對應的事件為onPacket。 * $clientInfo是客戶端的相關信息,是一個數組,有客戶端的IP和端口等內容 * 調用 `$server->sendto` 方法向客戶端發送數據 啟動服務 ---- ```shell php udp_server.php ``` UDP服務器可以使用`netcat -u` 來連接測試 ```shell netcat -u 127.0.0.1 9502 hello Server: hello ```
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