Smarty provides its own set of handy custom functions for creating form elements. In most cases you can still use these to draw QuickForm elements, but it's preferable to use $form.someElement.html instead, because

<?php 
require('HTML/QuickForm.php');
require('HTML/QuickForm/Renderer/ArraySmarty.php');
require('./slides/QuickForm_and_Smarty/setup.php');

$ratings = array('superb','marvelous','outstanding','stupendous','fabulous');
$tpl->assign('ratings',$ratings); // for the smarty radio button function

$form = new HTML_QuickForm('ratingForm','POST', $_SERVER['REQUEST_URI']);

$ratingRadios = array();
foreach ($ratings as $r) {                   // type, name, label,text,value
    $ratingRadios[] = $form->createElement('radio',null, null, $r,   $r);    
}

$form->addGroup($ratingRadios,'rating',null,'<br />');
$form->addGroupRule('rating','Please give us your honest opinion','required');

//  custom validation function
function isValidSelection($value,$array) {     return in_array($value,$array); } 

// ... register custom rule/callback function
$form->registerRule('validateSelection', 'callback', 'isValidSelection');
// ..."add" the rule
$form->addRule('rating','invalid selection','validateSelection',$ratings);

$form->addElement('submit', 'submitRatingButton', 'Submit');

if ($form->validate()) {
    $tpl->assign('response','Aw gee, do you really think so?');
}

$renderer =& new HTML_QuickForm_Renderer_ArraySmarty($tpl);
$form->accept($renderer);
$tpl->assign('form', $renderer->toArray());
$tpl->display('smarty_vs_qform.tpl');
?>
     
Output
How would you rate this presentation?










Template:
<form action="{$smarty.server.REQUEST_URI}" method="post" >
{$response|default:"How would you rate this presentation?" }<br />
{if $form.rating.error}<span style="color:red">{$form.rating.error}</span><br />{/if}


{* quickform style (preferred) *}
{$form.rating.html}<br />
{$form.submitRatingButton.html}</form>

<form action="{$smarty.server.REQUEST_URI}" method="post" >
{* smarty style -- more verbose, more processing *}

{html_radios name=rating selected=$smarty.request.rating  values=$ratings output=$ratings separator="<br />"}

{ $form.submitRatingButton.html }</form>