软件简介

Amp 是一个 PHP 非阻塞并发框架，它提供了一个事件循环，promise 和 stream 作为异步编程的基础。与生成器结合使用的 promise
用于构建协程，它允许像同步代码一样编写异步代码，而不需要任何回调。

demo：

<?php

use Amp\Artax\Response;
use Amp\Loop;

require __DIR__ . '/../vendor/autoload.php';

Loop::run(function () {
    $uris = [
        "https://google.com/",
        "https://github.com/",
        "https://stackoverflow.com/",
    ];

    $client = new Amp\Artax\DefaultClient;
    $client->setOption(Amp\Artax\Client::OP_DISCARD_BODY, true);

    try {
        foreach ($uris as $uri) {
            $promises[$uri] = $client->request($uri);
        }

        $responses = yield $promises;

        foreach ($responses as $uri => $response) {
            print $uri . " - " . $response->getStatus() . $response->getReason() . PHP_EOL;
        }
    } catch (Amp\Artax\HttpException $error) {
        // If something goes wrong Amp will throw the exception where the promise was yielded.
        // The Client::request() method itself will never throw directly, but returns a promise.
        print $error->getMessage() . PHP_EOL;
    }
});