Example form using public form builder...

form_snippet.php

<?php

require_once( $_SERVER['DOCUMENT_ROOT'] . "/site/forms/forms.php" );

$f = Form('Contact', './')
	->setRenderer( fxForm::BASIC )  // Choose the renderer to use to convert this to HTML(5)
                                        // I also plan to implement a renderer for twitter's bootstrap and other renderers can
                                        // be plugged in as needed.

	->onSuccess('MySuccessHandler') // Which routine gets called on successful submission and validation?

	->add( Fieldset('About you...')
		->add( Input('name', 'Your name')->required() )            // Creates a text input with client + server validation
		->add( Email('email', 'Your email address')->required() )  // Creates an email input with client + server validation
		->add( URL('url', 'Your Website') )                        // Same here but for a url
		)

	->add( Fieldset('Your message...')
		->add( Textarea('msg', 'Your message to us')->required()->maxlength(1000) )
	)

	->add( Fieldset('Legal stuff...')
		->add( Checkbox('cond', '>I Agree to the terms and conditions.' ) )  // Creates a checkbox with a right-aligned label
	)

	->add( Submit('Send')->enabledIf('cond.checked') ) // Submit button state is controlled by the checkbox state (client side)
                                                           // Of course, on the server side, validation of elements will still take place.
                                                           // enabledIf() also allows you to check form element values.
                                                           // eg: ->enabledIf('age.value<18')
	->process()
	;

echo $f;