PHP 函数并发编程在大型系统中的应用

use GuzzleHttpClient;function fetchPage(string $url): string{    $client = new Client();    return $client->request('GET', $url)->getBody()->getContents();}function coroutineHttpRequests(): array{    $urls = ['https://example.com', 'https://example.com/about', 'https://example.com/contact'];    $results = [];    // Create a generator function    function* coroutine() {        foreach ($urls as $url) {            $result = yield fetchPage($url);            $results[] = $result;        }    }    // Spawn the coroutine    $coroutine = coroutine();    // Iterate over the coroutine and yield results    while ($coroutine->valid()) {        $coroutine->send();    }    return $results;}$results = coroutineHttpRequests();print_r($results);

use ZipArchive;function compressFile(string $filename): void{    $zip = new ZipArchive();    if ($zip->open($filename . '.zip', ZipArchive::CREATE) === true) {        foreach (glob($filename . '/*') as $file) {            $zip->addFile($file, basename($file));        }        $zip->close();    }}function parallelFileCompression(): void{    $files = ['file1', 'file2', 'file3'];    // Create a Process object for each file    $processes = array_map(function ($file) {        return new Process("compressFile($file)");    }, $files);    // Start the processes    foreach ($processes as $process) {        $process->start();    }    // Wait for the processes to finish    foreach ($processes as $process) {        $process->wait();    }}parallelFileCompression();