class My_Form_Registration extends Zend_Form
{
    public function init()
    {
        // Erstellt die Benutzer Subform: Benutzername und Passwort
        $user = new Zend_Form_SubForm();
        $user->addElements(array(
            new Zend_Form_Element_Text('username', array(
                'required'   => true,
                'label'      => 'Benutzername:',
                'filters'    => array('StringTrim', 'StringToLower'),
                'validators' => array(
                    'Alnum',
                    array('Regex',
                          false,
                          array('/^[a-z][a-z0-9]{2,}$/'))
                )
            )),

            new Zend_Form_Element_Password('password', array(
                'required'   => true,
                'label'      => 'Passwort:',
                'filters'    => array('StringTrim'),
                'validators' => array(
                    'NotEmpty',
                    array('StringLength', false, array(6))
                )
            )),
        ));

        // Erstellt die Demographische Subform: Vorname,
        // Familienname und Ort
        $demog = new Zend_Form_SubForm();
        $demog->addElements(array(
            new Zend_Form_Element_Text('givenName', array(
                'required'   => true,
                'label'      => 'Vorname (erster):',
                'filters'    => array('StringTrim'),
                'validators' => array(
                    array('Regex',
                          false,
                          array('/^[a-z][a-z0-9., \'-]{2,}$/i'))
                )
            )),

            new Zend_Form_Element_Text('familyName', array(
                'required'   => true,
                'label'      => 'Familienname (letzter):',
                'filters'    => array('StringTrim'),
                'validators' => array(
                    array('Regex',
                          false,
                          array('/^[a-z][a-z0-9., \'-]{2,}$/i'))
                )
            )),

            new Zend_Form_Element_Text('location', array(
                'required'   => true,
                'label'      => 'Der eigene Ort:',
                'filters'    => array('StringTrim'),
                'validators' => array(
                    array('StringLength', false, array(2))
                )
            )),
        ));

        // Erstellt die Mailinglisten Subform
        $listOptions = array(
            'none'        => 'keine Listen bitte',
            'fw-general'  => 'Zend Framework General Liste',
            'fw-mvc'      => 'Zend Framework MVC Liste',
            'fw-auth'     => 'Zend Framework Authentication und ACL Liste',
            'fw-services' => 'Zend Framework Web Services Liste',
        );
        $lists = new Zend_Form_SubForm();
        $lists->addElements(array(
            new Zend_Form_Element_MultiCheckbox('subscriptions', array(
                'label'        =>
                    'Welche Liste wollen Sie erhalten?',
                'multiOptions' => $listOptions,
                'required'     => true,
                'filters'      => array('StringTrim'),
                'validators'   => array(
                    array('InArray',
                          false,
                          array(array_keys($listOptions)))
                )
            )),
        ));

        // Die Subformen der Hauptform anhängen
        $this->addSubForms(array(
            'user'  => $user,
            'demog' => $demog,
            'lists' => $lists
        ));
    }
}

            

class My_Form_Registration extends Zend_Form
{
    // ...

    /**
     * Eine Subform für die anzeige Vorbereiten
     * 
     * @param  string|Zend_Form_SubForm $spec 
     * @return Zend_Form_SubForm
     */
    public function prepareSubForm($spec)
    {
        if (is_string($spec)) {
            $subForm = $this->{$spec};
        } elseif ($spec instanceof Zend_Form_SubForm) {
            $subForm = $spec;
        } else {
            throw new Exception('Ungültiges Argument an ' .
                                __FUNCTION__ . '() übergeben');
        }
        $this->setSubFormDecorators($subForm)
             ->addSubmitButton($subForm)
             ->addSubFormActions($subForm);
        return $subForm;
    }

    /**
     * Form Dekoratore zu einer individuellen Subform hinzufügen
     * 
     * @param  Zend_Form_SubForm $subForm
     * @return My_Form_Registration
     */
    public function setSubFormDecorators(Zend_Form_SubForm $subForm)
    {
        $subForm->setDecorators(array(
            'FormElements',
            array('HtmlTag', array('tag' => 'dl',
                                   'class' => 'zend_form')),
            'Form',
        ));
        return $this;
    }

    /**
     * Einen Sendebutton in einer individuellen Subform hinzufügen
     * 
     * @param  Zend_Form_SubForm $subForm
     * @return My_Form_Registration
     */
    public function addSubmitButton(Zend_Form_SubForm $subForm)
    {
        $subForm->addElement(new Zend_Form_Element_Submit(
            'save', 
            array(
                'label'    => 'Speichern und Fortfahren',
                'required' => false,
                'ignore'   => true,
            )
        ));
        return $this;
    }

    /**
     * Aktion und Methode der Subform hinzufügen
     * 
     * @param  Zend_Form_SubForm $subForm 
     * @return My_Form_Registration
     */
    public function addSubFormActions(Zend_Form_SubForm $subForm)
    {
        $subForm->setAction('/registration/process')
                ->setMethod('post');
        return $this;
    }
}

            

class RegistrationController extends Zend_Controller_Action
{
    protected $_form;

    public function getForm()
    {
        if (null === $this->_form) {
            $this->_form = new My_Form_Registration();
        }
        return $this->_form;
    }
}

            

class RegistrationController extends Zend_Controller_Action
{
    // ...

    protected $_namespace = 'RegistrationController';
    protected $_session;

    /**
     * Den Session Namespace erhalten den wir verwenden
     * 
     * @return Zend_Session_Namespace
     */
    public function getSessionNamespace()
    {
        if (null === $this->_session) {
            $this->_session =
                new Zend_Session_Namespace($this->_namespace);
        }

        return $this->_session;
    }

    /**
     * Eine Liste von bereits in der Session gespeicherten Forms erhalten
     * 
     * @return array
     */
    public function getStoredForms()
    {
        $stored = array();
        foreach ($this->getSessionNamespace() as $key => $value) {
            $stored[] = $key;
        }

        return $stored;
    }

    /**
     * Eine Liste aller vorhandenen Subforms erhalten
     * 
     * @return array
     */
    public function getPotentialForms()
    {
        return array_keys($this->getForm()->getSubForms());
    }

    /**
     * Welche Subform wurde übermittelt?
     * 
     * @return false|Zend_Form_SubForm
     */
    public function getCurrentSubForm()
    {
        $request = $this->getRequest();
        if (!$request->isPost()) {
            return false;
        }

        foreach ($this->getPotentialForms() as $name) {
            if ($data = $request->getPost($name, false)) {
                if (is_array($data)) {
                    return $this->getForm()->getSubForm($name);
                    break;
                }
            }
        }

        return false;
    }

    /**
     * Die nächste Suboform für die Anzeige erhalten
     * 
     * @return Zend_Form_SubForm|false
     */
    public function getNextSubForm()
    {
        $storedForms    = $this->getStoredForms();
        $potentialForms = $this->getPotentialForms();

        foreach ($potentialForms as $name) {
            if (!in_array($name, $storedForms)) {
                return $this->getForm()->getSubForm($name);
            }
        }

        return false;
    }
}

            

class My_Form_Registration extends Zend_Form
{
    // ...
    
    /**
     * Ist die Form gültig?
     * 
     * @param  Zend_Form_SubForm $subForm 
     * @param  array $data 
     * @return bool
     */
    public function subFormIsValid(Zend_Form_SubForm $subForm,
                                   array $data)
    {
        $name = $subForm->getName();
        if ($subForm->isValid($data)) {
            $this->getSessionNamespace()->$name = $subForm->getValues();
            return true;
        }

        return false;
    }

    /**
     * Ist die komplette Form gültig?
     * 
     * @return bool
     */
    public function formIsValid()
    {
        $data = array();
        foreach ($this->getSessionNamespace() as $key => $info) {
            $data[$key] = $info;
        }

        return $this->getForm()->isValid($data);
    }
}

            

class RegistrationController extends Zend_Controller_Action
{
    // ...

    public function indexAction()
    {
        // Entweder die aktuelle Seite nochmals anzeigen, oder
        // die nächste "next" (erste) Subform holen
        if (!$form = $this->getCurrentSubForm()) {
            $form = $this->getNextSubForm();
        }
        $this->view->form = $this->getForm()->prepareSubForm($form);
    }

    public function processAction()
    {
        if (!$form = $this->getCurrentSubForm()) {
            return $this->_forward('index');
        }

        if (!$this->subFormIsValid($form,
                                   $this->getRequest()->getPost())) {
            $this->view->form = $this->getForm()->prepareSubForm($form);
            return $this->render('index');
        }

        if (!$this->formIsValid()) {
            $form = $this->getNextSubForm();
            $this->view->form = $this->getForm()->prepareSubForm($form);
            return $this->render('index');
        }

        // Gültige Form!
        // Information in einer Prüfseite darstellen
        $this->view->info = $this->getSessionNamespace();
        $this->render('verification');
    }
}

            

<? // registration/index.phtml ?>
<h2>Registration</h2>
<?= $this->form ?>

<? // registration/verification.phtml ?>
<h2>Danke für die Registrierung!</h2>
<p>
    Hier sind die angegebenen Informationen:
</p>

<?
// Dieses Konstrukt muß getan werden wegen dem Weg wie Elemente
// im Session Namespace gespeichert werden
foreach ($this->info as $info):
    foreach ($info as $form => $data): ?>
<h4><?= ucfirst($form) ?>:</h4>
<dl>
    <? foreach ($data as $key => $value): ?>
    <dt><?= ucfirst($key) ?></dt>
    <? if (is_array($value)):
        foreach ($value as $label => $val): ?>
    <dd><?= $val ?></dd>
        <? endforeach;
       else: ?>
    <dd><?= $this->escape($value) ?></dd>
    <? endif;
    endforeach; ?>
</dl>
<? endforeach;
endforeach ?>