BasketHelper::update

static function update($id, $fields)
{
	global $APPLICATION;

	if (isset($fields["ID"]))
	{
		unset($fields["ID"]);
	}

	$id = (int)$id;
	$basket = new \CSaleBasket();
	$basket->Init();
	unset($basket);

	if (array_key_exists('QUANTITY', $fields) && (float)$fields['QUANTITY'] <= 0)
	{
		return static::delete($id);
	}

	$r = Basket::update($id, $fields);
	if (!$r->isSuccess())
	{
		foreach($r->getErrorMessages() as $error)
		{
			$APPLICATION->ThrowException($error);
		}

		return false;
	}

	return true;
}