Zend\u表单-如果表单无效,是否有方法重新发布到表单中?

$form = new Zend_Form();
$form->setAction('/submit');
$form->setMethod('post');
$form->addElement('text', 'first_name', array(
    'label' => 'First Name:',
    'required' => true));
if (!$form->isValid($_POST)) {
    //handle errors
} else {
    //success
}