After seeing validators for checking if a value exists in a database table for about the tenth time on IRC, i have decided to put up a proposal for Zend_Validate_DbMatch.
The code i have proposed should allow you to check if a value exists in a given field of a given table, and be easy to attach to your forms.
If you want to see this in the Zend Framework, or want to see the source see the proposals page in the ZF Wiki.
You can find the Zend_Validate_DbMatch proposal in full here

#1 by UnderDog on August 30, 2010 - 2:36 pm
Hi
Good that you made that proposal.
Better re-check the URL in your post