Keep in mind that mysqli::reap_async_query only returns mysqli_result on queries like SELECT. For queries where you may be interested in things like affected_rows or insert_id, you can't work off of the result of mysqli::reap_async_query as the example in mysqli::poll leads you to believe. For INSERT/UPDATE/DELETE queries, the data corresponding to the query can be accessed through the associated key to the first array in the mysqli::poll function.So instead of<?php    foreach ($links as $link) {        if ($result = $link->reap_async_query()) {            print_r($result->fetch_row());            mysqli_free_result($result);            $processed++;        }    }?>The data is accessible via:<?php    foreach ($links as $link) {        if ($result = $link->reap_async_query()) {            //This works for SELECT            if(is_object($result)){                print_r($result->fetch_row());                mysqli_free_result($result);            }            //This works for INSERT/UPDATE/DELETE            else {                print_r($link);            }            $processed++;        }    }?>