Zend FR

$this->view->fmessages = $this->_helper->Messenger->getMessages();

echo $this->fmessages;

//$messages= $this->view->getHelper('Messenger');
//$messages= $this->view->getHelper('Custom_Controller_Action_Helper_Messenger');

$messages = $this->_helper->Messenger->getMessages();

 $messageObject= new Custom_Controller_Action_Helper_Messenger;
 $messages = $messageObject->getMessages();

 protected function _initActionHelpers() {
   ...     
     
  // Messenger
  Zend_Controller_Action_HelperBroker::addHelper(new Custom_Controller_Action_Helper_Messenger());

  ...
}

<?php
class Zend_View_Helper_DisplayFlashMessages extends Zend_View_Helper_Abstract {
    
    public function displayFlashMessages()  {

        //$messages=Zend_Controller_Action_HelperBroker::getStaticHelper('Messenger');
        $messages = new Custom_Controller_Action_Helper_Messenger();
        
        if ($messages->count()) {
            //return $this->view->htmlList($messages->getMessages(),false,array('id' => 'messages'));
            return $messages->getMessages();
        } else {
            return 'no messages';
        }

    }
}
?>

<?php
var_dump($this->displayFlashMessages());
?>

 public function __construct()
    {
        if (!self::$_session instanceof Zend_Session_Namespace) {
            self::$_session = new Zend_Session_Namespace($this->getName());
        }
    }

    /**
     * setNamespace() - change the namespace messages are added to, useful for
     * per action controller messaging between requests
     *
     * @param  string $namespace
     * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface
     */
    public function setNamespace($namespace = 'default')
    {
        $this->_namespace = $namespace;
        return $this;
    }

    /**
     * resetNamespace() - reset the namespace to the default
     *
     * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface
     */
    public function resetNamespace()
    {
        $this->setNamespace();
        return $this;
    }

    /**
     * addMessage() - Add a message to message
     *
     * @param  string $message
     * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface
     */
    public function addMessage($message, $class='info')    {
        
        if (!is_array(self::$_session->{$this->_namespace})) {
            self::$_session->{$this->_namespace} = array();
        }
        self::$_session->{$this->_namespace}[] = array('message'=>$message, 'class'=>$class);
        return $this;
    }

    /**
     * setMessage() - Set a single message to message
     *
     * @param  string $message
     * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface
     */
    public function setMessage($message, $class='info')
    {
        self::$_session->{$this->_namespace} = array(array('message'=>$message, 'class'=>$class));
        return $this;
    }

    /**
     * hasMessages() - Wether a specific namespace has messages
     *
     * @return boolean
     */
    public function hasMessages()
    {
        return isset(self::$_session->{$this->_namespace});
    }

    /**
     * getMessages() - Get messages from a specific namespace
     *
     * @return array
     */
    public function getMessages($rxFormat=false) {
        
        if ($this->hasMessages()) {
            $msgs = array_merge(array(),self::$_session->{$this->_namespace});
            $this->clearMessages();
            
            if ($rxFormat) {
                //@@// require_once 'Rx/Messenger/Message.php';
                
                $formatedMsgs = array();
                foreach($msgs as $msg) {
                    $formatedMsgs[] = new Rx_Messenger_Message($msg);
                }
                
                return$formatedMsgs;
            }
            
            return $msgs;
        }

        return array();
    }

   public function indexAction() {
        $this->view->fmessages = $this->_helper->Messenger->getMessages();
        $this->view->config = $this->_config;
    }

if ($request->isPost()) {
               $formData = $this->getRequest()->getPost();
               
                if ($form->isValid($formData)) {
                    $authentification = new Custom_Auth_Authentication();
                    
                     if ($authentification->authenticate($formData)) {
                        $this->_redirect("/accueil-administration.html");
                    } else {
                       $this->_helper->Messenger('Vous n\'êtes pas reconnu. Veuillez vous reconnecter !','error');
                       $this->_redirect("/accueil.html");
                    }
                }
                
            }