function getAllCategories() { $app = \Slim\Slim::getInstance(); try { $app->response->setBody(json_encode(CategoriesDAO::getAll())); return json_encode($app->response->getBody()); } catch (Exception $e) { $app->response->setStatus(404); $app->response->setBody(getErrorMessage($e)); return json_encode($app->response->getBody()); } }