How to get request context in asynchronous curl request?

Question

PHP

There are about 2 thousand urls where you need to go and collect data, synchronously it takes about 27 minutes.
I want to rewrite it to an asynchronous method in order to reduce the time it takes to receive data, but I don’t quite understand how, where, in fact, I can receive data. Moreover, I need to make sure that the newly received data clearly corresponds to a certain key in the array. So far, the implementation is very vague.
Please push in the right direction.

for($counter = 0; $counter < count($app_objects); $counter++){
                    $link = 'example.com';
                    $process = curl_init($link);
                    curl_setopt($process, CURLOPT_HTTPHEADER, array('Content-Type: application/json', false));
                    curl_setopt($process, CURLOPT_RETURNTRANSFER , 1);
                    $resources[$counter] = $process;
                }

                $multi_curl = curl_multi_init();

                foreach ($resources as $resource){
                    curl_multi_add_handle($multi_curl,$resource);
                }

                $active = false;

                do {
                    $mrc = curl_multi_exec($multi_curl, $active);
                } while ($active > 0);

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