In this post to his blog Trevor Morris talks about his own introduction to the Fuel framework and some of his investigation into working with its forms support and validating the user input that comes from them.

I have been working on developing a website with the newest PHP framework on the block - Fuel, which describes itself as "a simple, flexible, community driven PHP 5.3 web framework based on the best ideas of other frameworks with a fresh start". [...] Although Fuel is a new framework, it borrows a lot of ideas from two very popular PHP frameworks, CodeIgniter and Kohana.

He starts off with one concern, a lack of documentation around some things that made it difficult for him to work with the HTML form helpers. He includes an example code snippet to show a basic email form field generation. Behind the scenes, he shows how to use the Validation library to add rules on the fields and check for a pass/fail status on the fields.