高效下载：开发 PHP 异步 HTTP 下载多个文件的最佳实践

require 'vendor/autoload.php';
use GuzzleHttpClient;
use GuzzleHttpPromise;

$client = new Client();
$promises = [];

// 定义需要下载的文件列表
$urls = [
    'http://example.com/file1.jpg',
    'http://example.com/file2.jpg',
    'http://example.com/file3.jpg'
];

// 发起异步下载请求
foreach ($urls as $url) {
    $promises[] = $client->getAsync($url);
}

// 等待所有下载请求完成
$results = Promiseunwrap($promises);

// 保存下载的文件
foreach ($results as $key => $response) {
    file_put_contents('download/file' . ($key+1) . '.jpg', $response->getBody());
}

require 'vendor/autoload.php';
use ReactEventLoopFactory;
use ReactPromiseDeferred;
use ReactHttpClientResponse;

$loop = Factory::create();
$client = new ReactHttpClientClient($loop);

// 定义需要下载的文件列表
$urls = [
    'http://example.com/file1.jpg',
    'http://example.com/file2.jpg',
    'http://example.com/file3.jpg'
];

// 发起异步下载请求
foreach ($urls as $url) {
    $deferred = new Deferred();
    
    $client->request('GET', $url)
        ->on('response', function (Response $response) use ($deferred) {
            $chunks = [];
            $response->on('data', function ($data) use (&$chunks) {
                $chunks[] = $data;
            });
            $response->on('end', function () use (&$chunks, $deferred) {
                $file = 'download/' . basename($url);
                file_put_contents($file, implode('', $chunks));
                $deferred->resolve();
            });
        })
        ->on('error', function (Exception $error) use ($deferred) {
            $deferred->reject($error);
        });
    
    $promises[] = $deferred->promise();
}

// 等待所有下载请求完成
ReactPromisell($promises)->then(function () {
    echo 'All files have been downloaded!';
});

$loop->run();