Although the documentation says you must provide a number between 0 and count - 1, you can actually supply a negative number, which appears to be cast to positive (such as in abs()).For example:<?php$db = new mysqli('localhost', 'test', 'password', 'schema');$db->multi_query(" SELECT * FROM ( SELECT 1 as 'position' UNION SELECT 2 as 'position' UNION SELECT 3 as 'position' UNION SELECT 4 as 'position' UNION SELECT 5 as 'position' ) as rows"); $result = $db->store_result();for ($i = 0; $i < $result->num_rows; $i++){ $offset = $i; $result->data_seek($offset); var_dump("Seek offset is: {$offset}", $result->fetch_object());}for ($i = 0; $i < $result->num_rows; $i++){ $offset = -$i; $result->data_seek($offset); var_dump("Seek offset is: {$offset}", $result->fetch_object());}