php 异步get请求

<?php
function asyncCurl($urls) {
    $mh = curl_multi_init();
    $ch = [];
    foreach ($urls as $i => $url) {
        $ch[$i] = curl_init();
        curl_setopt($ch[$i], CURLOPT_URL, $url);
        curl_setopt($ch[$i], CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch[$i], CURLOPT_TIMEOUT, 1);
        curl_setopt($ch[$i], CURLOPT_CUSTOMREQUEST, "GET");
        curl_setopt($ch[$i], CURLOPT_HEADER, 0);
        curl_multi_add_handle($mh, $ch[$i]);
    }

    do {
        $mrc = curl_multi_exec($mh, $active);
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);

    while ($active && $mrc == CURLM_OK) {
        if (curl_multi_select($mh) != -1) {
            do {
                $mrc = curl_multi_exec($mh, $active);
            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }
    }

    $results = [];
    foreach ($ch as $i => $handle) {
        $results[$i] = curl_multi_getcontent($handle);
        curl_multi_remove_handle($mh, $handle);
        curl_close($handle);
    }

    curl_multi_close($mh);
    return $results;
}

$urls = [
    'https://api.example.com/data1',
    'https://api.example.com/data2',
    'https://api.example.com/data3'
];

$results = asyncCurl($urls);
print_r($results);
?>