How cakephp2 call method another helper to current helper? - cakephp-2.0

Question

I have created helper name TicketHelper (has TicketsController), CommonHelper (no controller) and ExcelHelper (no controller). Inside TicketHelper it work fine when called any function of CommonHelper. Here example TicketHelper:
<?php
class TicketHelper extends AppHelper {
public $helpers = array('Session','Common');
public function myFunction(){
echo $this->Common->workfine();
}
?>
By the same action i called CommonHelper to ExcelHelper it produces error: Fatal error: Call to a member function workfine() on a non-object in

Answer 1

After many hours check, i found mistake problem with constructor
<?php
class TicketHelper extends AppHelper {
public $helpers = array('Session','Common');
public function myFunction(){
echo $this->Common->workfine();
}
//Here my problem constructor Note: function name and class name are the same
function TicketHelper (){
//My code here
}
/**
* It should be follow cakephp doc
* function __construct($id = false, $table = null, $ds = null) {
* parent::__construct($id, $table, $ds);
*
* }
*
*/
?>

Answer 2

You should not use a helper inside a controller. A helper is used for logic in the view. It is included in the controller but accessible in the view. For logic shared between controllers, use a component instead http://book.cakephp.org/2.0/en/controllers/components.html#creating-a-component.
If you still want to use a helper in the controller (not recommended):
$view = new View($this);
$myHelper = $view->loadHelper('MyHelper');