curl-multi approaches

Approach #1

    // While we're still active, execute curl
        $active = null;
        do {
            $mrc = curl_multi_exec($multi, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);

        while ($active && $mrc == CURLM_OK) {
            // Wait for activity on any curl-connection
            if (curl_multi_select($multi) == -1) {
                continue;
            }
            // Continue to exec until curl is ready to give us more data
            do {
                $mrc = curl_multi_exec($multi, $active);
            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }





Approach #2

        //$running = null;
        //do {
        //  curl_multi_exec($mh, $running);
        //} while ($running);

        do {
            $status = curl_multi_exec($mh, $active);

            if ($active) {
                curl_multi_select($mh);
            }
        }
        //while ($active && $status == CURLM_OK);
        while ($active && $mrc == CURLM_OK) {
            if (curl_multi_select($mh) == -1) {
                usleep(100); continue;
            }
            do {
                $mrc = curl_multi_exec($mh, $active);
            } while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }