Disabling layout & view rendering for direct response output in Zend Framework

Sometimes you want to disable default layout & view rendering in Zend Framework, for example to output a JSON response.

The following bolded two lines do the job:

    public function vouchersForNumberAction() {             $this->_helper->layout->disableLayout();             $this->_helper->viewRenderer->setNoRender(true);             ...             $data = new Zend_Dojo_Data('code', $vouchers, 'title');             header('Content-Type: application/json');             echo $data->toJson();     }