PHP异步编程：协程与异步I/O的结合技巧

use Swoole\Coroutine;
use Swoole\Event;

$http = new HttpServer("127.0.0.1", 9501);
$http->on("request", function(HttpServerRequest $request, HttpServerResponse $response) {
    Coroutine::create(function() use ($request, $response) {
        $method = $request->getMethod();
        $path = $request->getUri()->getPath();
        $query = $request->getUri()->getQueryParams();

        // 执行耗时的操作，如数据库查询
        $result = yield from doSomethingAsync($method, $path, $query);

        // 将结果写入响应
        $response->end($result);
    });
});
$http->start();

use Amp\Loop;
use Amp\Websocket\Client;
use Amp\Websocket\Message;

Loop::run(function() {
    // 多个网站的URL列表
    $urls = ["example1.com", "example2.com", "example3.com"];

    // 同时爬取多个网站
    foreach ($urls as $url) {
        $client = new Client($url);
        yield $client->open();

        // 发送HTTP GET请求
        $request = new Message(null, Message::TYPE_HTTP_GET, $url);
        yield $client->send($request);

        // 接收HTTP响应
        // yield from $client->receive() 返回HTTP响应消息
    }
});