Dynamic Forms with PHP

[coplan]

I am writing a CMS engine for a custom setup, but it needs to be modular.  One of the things I'd like to control in the core is HTML forms.  A lot of the modules for this system will not be coded by myself, and I want to standardize the form structure, styles and whatever.  The problem is that there are a lot of variables:  Number of columns and rows, input types (radio buttons, text area, checkboxes, etc), variable names, etc. 

 

My first question:  Is there a PHP module or API out there that already handles this well?

 

If not, can anyone point me in a good direction as to how to set this up? 

 

Side note:  I'm using the Smarty engine for most of my templating.  If I have to code something from scratch, I would prefer using Smarty for as much HTML as possible.