I'm looking for an easy to use, reasonably complete form validation solution for php. I recall using one years ago that used a few tags on the HMTL side then captured the OB to replace them with some pretty serious code. This feels slightly like overkill me, yet I'm not REALLY wanting to go nuts with my own right now. I'm using SMARTY, so anything I use should not throw too many curve balls.
I'm going to be validating the basics, name, address, email, credit card number (format validation OK)...
Any ideas? Thanks folks!