HTML_QuickForm2 is a PHP5 rewrite of HTML_QuickForm and HTML_QuickForm_Controller packages. It provides methods to create, validate and render HTML forms.
Supports all form elements defined by HTML standard, provides several custom elements.
Server-side and client-side validation, several common rules provided.
Multipage forms (tabbed forms and wizards)
Pluggable elements, rules, renderers and renderer plugins
Major advantages over PHP4 versions:
Most of the package's functionality is covered by unit tests.
DOM-like API for building the form structure, new streamlined API for elements' values handling.
Default rendering without tables (inspired by HTML_QuickForm_Renderer_Tableless).
Renderer plugins for elements with complex rendering needs.
Ability to chain validation rules with 'and' and 'or'.
Client-side validation can run "live" on changing the form fields, validation errors are displayed near the fields instead of in alert() (similar to HTML_QuickForm_DHTMLRulesTableless).