public function switchAction() { $this->_helper->viewRenderer->setNoRender(); $id = trim($this->getRequest()->getParam('id')); if (isset($this->authidentity) && $this->authidentity->userid != $id) { $userModel = new Application_Model_Users($this->registry->DB); $userModel->switchUser($id); echo json_encode(array('status' => 'success')); } else { echo json_encode(array('status' => 'error')); } }