PHPit.net has posted Part 2 in their "PHP:Form Series" - Formtypes & Setting Default Values.

Welcome to the second part of the PHP:Form Series. In the previous part I explained exactly what PHP:Form is, and one of its core features; inbuilt validators. In case you have forgotten, or haven't read that part yet, it might be wise to read it before reading this part. I'm assuming you have a reasonable understanding of how PHP:Form works.

In this part we're going to have a look at "form types" and the ability to set the default values using PHP. I've also included several code examples and live demos.

They look at what the different form types are (other than the usual form element types) and the live demos to help you see them in action. From there, they help you introduce default values and give you plenty of examples...