PHPBuilder.com has this new article posted today with a look at PHP form validation - from an object-oriented approach.

All web developers will at some point need to program their own form. Whether it is for database submission, emailing, or for some other purpose, forms represent the primary means of enabling a user to send data to an application. As a result, it is important to have control over the data collected by your forms, which will aid in the creation of streamlined, error-free applications.

Continuing down that same line of thought, they show you how to design an application, providing first the layout/design of the interface and *then* going to the code. They lay out the entire class and explain how each of the methods work, both with each other and with the data that's passed in.

Looks pretty solid - it's a good, basic approach, but lacks any kind of normal validation styles, like a checkEmail function or something of the type...