Removing an item from the Bitrix cart?

Question

1C-Bitrix

Guys, how do I remove an item from the cart if two items have the same id?
For example:
three products with the same id were put in the cart, one needs to be removed from the cart, so that the rest would remain?
All three products are deleted by the standard method, how can I delete one product?

Answer 1

You do not need to delete this product, but only reduce its quantity, for example like this:

use Bitrix\Sale;

$productId = 1234; // id нашего товара

// получаем корзину пользователя
$basket = Sale\Basket::loadItemsForFUser(
  Sale\Fuser::getId(),
  Bitrix\Main\Context::getCurrent()->getSite()
);

/** @var Sale\BasketItem $basketItem */
foreach ($basket as $basketItem) {
    if ($basketItem->getProductId() == $productId) {
        $basketItem->setField('QUANTITY', $basketItem->getQuantity() - 1);
    }
}

$basket->save();