In PHP authentication systems, how do I parallelize workloads?

    // Example of parallelizing tasks in PHP using cURL multi-handles
    function parallelRequests($urls) {
        $multiCurl = curl_multi_init();
        $curlHandles = [];

        foreach ($urls as $url) {
            $curlHandles[$url] = curl_init($url);
            curl_setopt($curlHandles[$url], CURLOPT_RETURNTRANSFER, true);
            curl_multi_add_handle($multiCurl, $curlHandles[$url]);
        }

        $running = null;
        do {
            curl_multi_exec($multiCurl, $running);
            curl_multi_select($multiCurl);
        } while ($running > 0);

        $responses = [];
        foreach ($curlHandles as $url => $handle) {
            $responses[$url] = curl_multi_getcontent($handle);
            curl_multi_remove_handle($multiCurl, $handle);
            curl_close($handle);
        }
        curl_multi_close($multiCurl);

        return $responses;
    }

    $urls = ['https://api.example.com/user1', 'https://api.example.com/user2'];
    $results = parallelRequests($urls);
    print_r($results);