public function actionRecalc()
{
$post_counts = array();
$ids = Yii::$app->session->get('ids');
for ($i = 0; $i < count($ids); $i++) {
$post_counts[$i] = $_POST['count' . $ids[$i]];
}
$cart = new Cart();
$cart->recalc($ids, $post_counts);
return $this->redirect(Yii::$app->request->referrer);
}