title: Call function in indexController from another controller Zend
body: <p>Need to call some function from another controller (not IndexController), for example:</p>
  
  <pre><code>class IndexController extends Zend_Controller_Action
  {
  
  public function indexAction()
  {
      $someFunction = new CustomController();
      $someFunction-&gt;someFunc();
  }
  </code></pre>
  
  <p>}
  But this throws an error :</p>
  
  <pre><code>Fatal error: Class 'CustomController' not found in C:\xampp\htdocs\demo.ru\application\controllers\IndexController.php on line 13
  </code></pre>