public function actionCities()
{
$country = Yii::$app->request->post('country');
if (empty($country) || $country === 'undefined') {
return null;
}
$province = Yii::$app->request->post('province');
if (empty($province) || $province === 'undefined') {
return null;
}
return City::asArray(Country::get($country)->getProvince($province)->cities);
}
