If you want that your method return data in specific format in Yii2 then you can use this simple construction:
Example method return in JSON format:
use yii\web\Response;
//......
public function actionJson()
{
$something = true; // or you can set for test -> false;
$return_json = ['status' => 'error'];
if ($something == true)
{
$return_json = ['status' => 'success', 'message' => ' is successfully saved'];
}
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return $return_json;
}
/*header results
Connection: Keep-Alive
Content-Length: 55
Content-Type : application/json; charset=UTF-8
*/
Continue reading Yii 2 Response formats: RAW, HTML, JSON, JSONP, XML