[PHP] confused about logic

[Aaron Wolski]

Hi All,
 
I have input for where users can enter order numbers in which to search
the database to find results matching their entry.
 
To enter multiple order numbers they can comma separate like:
1,34,21,34,54
 
What I need to do is take those numbers and make a query that would like
like:
 
(cart_id in('1','34','21','34','54') OR id in('1','34','21','34','54'))
 
ANY idea how I can accomplish this?
 
Thanks all!
 
Aaron