php网络编程指南：异步编程和事件循环

use ReactEventLoopLoop;use ReactHttpClientClient;// 创建事件循环$loop = Loop::get();// 发送 HTTP 请求$client = new Client($loop);$client->request('GET', 'http://example.com')->then(function ($response) use ($loop) {    // 响应处理完毕后关闭循环    $loop->stop();}, function ($e) {    // 出错后关闭循环    $loop->stop();});// 运行事件循环$loop->run();

use RatchetServerIoServer;use RatchetHttpHttpServer;use RatchetWebSocketWsServer;// Chat 消息处理器class Chat implements MessageComponentInterface{    // 所有连接的客户端    protected $clients;    public function onOpen(ConnectionInterface $conn)    {        $this->clients[] = $conn;    }    public function onMessage(ConnectionInterface $from, $msg)    {        foreach ($this->clients as $client) {            $client->send($msg);        }    }    public function onClose(ConnectionInterface $conn)    {        // 从客户端集移除连接    }    public function onError(ConnectionInterface $conn, Exception $e)    {        // 出错后关闭连接    }}// 创建 HTTP 服务器$http = new HttpServer(new WsServer(new Chat()));// 创建并运行 IO 服务器$io = new IoServer($http, 8080);$io->run();