<?php
$query = "SELECT id,name,rank,(cmdtime+sqltime-lwtime)/3600 as `off`,country FROM player WHERE time > 360000 ORDER BY `off` DESC LIMIT 5";

$query2 = "SET @n:=0";
$query3 = str_replace("FROM", ", @n:=@n+1 as num FROM", $query);
$query3 = str_replace("LIMIT 5", "", $query3);
?>