How do I do arithmetic in a MySQL db?

[thewhenwhen]

Edit: I figured it out. This is what I was looking for:


$x = ($userdata['user_whatever'] + 5);


$result = dbquery("UPDATE ".$db_prefix."users SET user_what= '$now', user_ever = '$addition' WHERE user_id='".$userdata['user_id']."'") or die(mysql_error());