The Horde_Form API does what every form library does, providing an abstract interface to create and validate forms.

Features of Horde's Form library:

• 53 different field types: simple types like "text" or "int" and complex ones like "address", "image", or "date".
• Not enough? Add your own ones.
• Validation of required fields and field contents.
• Abstracted renderers: HTML, WML, PDF?
• Optional protection agains re-submission.