How to set a condition for checking the amount in the cart?

Question

Yii

The question is. I need a condition, for example, if the basket amount is < 20000r, then false, else true.
How can this be represented in the controller?

public function actionView() {
        $session=Yii::$app->session;
        $session->open();
        //$this -> setMeta('Корзина');
        $orders = new Orders();
        if ($orders->load(Yii::$app->request->post())){
            $orders->qty = $session['cart.qty'];
            $orders->sum = $session['cart.sum'];
            if($orders->save()) {
                $this->saveOrdersItem($session['cart'], $orders->id);
                Yii::$app->session->setFlash('success', 'Ваш заказ принят, менеджер свяжется с вами.');
                $session->remove('cart');
                $session->remove('cart.qty');
                $session->remove('cart.sum');
                return $this->refresh();
            } else Yii::$app->session->setFlash('success', 'Ошибка оформления заказа');
        }
        return $this->render('view', compact('session', 'orders'));
    }

Answer 1

In my opinion, this is obvious:
or if you need to customize the logic, then

if($orders->sum < 20000){
  //тут если условие выполнено
}else{
  //тут если условие не выполнено
}

At what it is absolutely not important in the controller it or somewhere else.
Unless of course there is a number and not a string with the amount and the name of the currency.
I highly recommend reading at least the first paragraph on php, how do you plan to work with the language without knowing it at all?