Perform multiple cURL requests in parallel with PHP

func-curlMulti.php

/**
 * perform multiple curl requests in parallel
 * @param array.<string> $urls - an indexed array of urls to fetch
 * @param array.<integer> $curopts - curl options to pass to curl_setopt_array()
 * @return array
 */
function curlMulti(array $urls, array $curlopts)
{
   $ret = [];
   $chs = [];
   $mh = curl_multi_init();
   
   $len = count($urls);
   for ($i=0; $i<$len; $i++) {
      $chs[$i] = curl_init($urls[$i]);
      curl_setopt_array($chs[$i], $curlopts);
      curl_multi_add_handle($mh, $chs[$i]);
   }

   do {
      curl_multi_exec($mh, $active);
      curl_multi_select($mh, .1);
   }
   while ($active);

   for ($i=0; $i<$len; $i++) {
      $info = curl_getinfo($chs[$i]);
      $ret[$info['url']] = [
         'info' => $info,
         'content' => mb_convert_encoding(
            curl_multi_getcontent($chs[$i]), 
            'HTML-ENTITIES', 
            'UTF-8'
         )
      ];
   }
   curl_multi_close($mh);
   return $ret;
}