Zend FR

    /**
     * Dispatch the requested action
     *
     * @param string $action Method name of action
     * @return void
     */
    public function dispatch($action)
    {
        // Notify helpers of action preDispatch state
        $this->_helper->notifyPreDispatch();

        $this->preDispatch();
        if ($this->getRequest()->isDispatched()) {
            if (null === $this->_classMethods) {
                $this->_classMethods = get_class_methods($this);
            }
            $method = ucfirst($this->getRequest()->getMethod());

            // preDispatch() didn't change the action, so we can continue
            if ($this->getInvokeArg('useCaseSensitiveActions') || in_array($action, $this->_classMethods) || in_array($action.$method, $this->_classMethods)) {
                if ($this->getInvokeArg('useCaseSensitiveActions')) {
                    trigger_error('Using case sensitive actions without word separators is deprecated; please do not rely on this "feature"');
                }
                if (in_array($action.$method, $this->_classMethods)) {
                    $action = $action.$method;
                }
                $this->$action();
            } else {
                $this->__call($action, array());
            }
            $this->postDispatch();
        }

        // whats actually important here is that this action controller is
        // shutting down, regardless of dispatching; notify the helpers of this
        // state
        $this->_helper->notifyPostDispatch();
    }

    /**
     * The sign action is responsible for handling the "signing" of the 
     * guestbook. 
     *
     * Assuming the default route and default router, this action is dispatched 
     * via the following url:
     *   /guestbook/sign with POST method
     *
     * @return void
     */
    public function signActionPost()
    {
        // now check to see if the form submitted exists, and
        // if the values passed in are valid for this form
        if ($this->_getGuestbookForm()->isValid($this->getRequest()->getPost())) {
            
            // since we now know the form validated, we can now
            // start integrating that data sumitted via the form
            // into our model
            $model = $this->_getModel();
            $model->save($this->_getGuestbookForm()->getValues());
            
            // now that we have saved our model, lets url redirect
            // to a new location
            // this is also considered a "redirect after post"
            // @see http://en.wikipedia.org/wiki/Post/Redirect/Get
            return $this->_helper->redirector('index');
        } else {
            return $this->_helper->redirector('sign');
        }
    }

    /**
     * The sign action is responsible for display the "signing" form of the 
     * guestbook. 
     *
     * Assuming the default route and default router, this action is dispatched 
     * via the following url:
     *   /guestbook/sign with GET method
     *
     * @return void
     */
    public function signActionGet()
    {
        // assign the form to the view
        $this->view->form = $this->_getGuestbookForm();
    }

    /**
     * The sign action is responsible for display the "signing" form of the 
     * guestbook. 
     *
     * Assuming the default route and default router, this action is dispatched 
     * via the following url:
     *   /guestbook/sign with any method other than POST
     *
     * @return void
     */
    public function signAction()
    {
        // assign the form to the view
        $this->view->form = $this->_getGuestbookForm();
    }