Better code indentation
You don't need to indent your $ser_ value assignments.  Indentation should be left for within a class, method, loop, etc as you do for most of your other code.  I notice that you separate your MySQL statement, which can be done, but on such a simple query, really isn't needed as the only purpose for doing that is to help readability when it is a complicated query. ^^

On a side note, mysql_ functions are deprecated now, and you should switch to mysqli_ (or the MySQLi class), or (preferably) PDO.