I'm just starting out with Zend Framework and am having issues using Zend_Controller_Action_HelperBroker::addPath() to add helpers. I'm not sure if my classes are named incorrectly, I'm giving it the wrong prefix, or what I'm doing wrong so I will post the code and file structure and get out of the way.

In Bootstrap.php public function __construct($application)

{
    ...
    // This works with a manual include_once('../application/plugins/helpers/Csrf.php');
    //Zend_Controller_Action_HelperBroker::addHelper(new Application_Controller_Action_Helper_Csrf());

    // This isn't picking up my helper class automagically
    Zend_Controller_Action_HelperBroker::addPath('../application/plugins/helpers','Application_Controller_Action_Helper');

   ...
}

In application/plugins/helpers/Csrf.php

class Application_Controller_Action_Helper_Csrf extends Zend_Controller_Action_Helper_Abstract
{
   ...
}

My directory tree:

/
application/
   ...
   plugins/
      helpers/
         Csrf.php
      CsrfProtect.php
...