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CModule::IncludeModule('sale');
CModule::IncludeModule('catalog');
use Bitrix\Sale;
$basket = Sale\Basket::loadItemsForFUser(Sale\Fuser::getId(), Bitrix\Main\Context::getCurrent()->getSite());
echo Sale\Fuser::getId().''.Bitrix\Main\Context::getCurrent()->getSite();
$productId=333;
$quantity=1;
      if ($item = $basket->getExistsItem('catalog', $productId)) {
         echo "yes";
         $item->setField('QUANTITY', $item->getQuantity() + $quantity);
      }
      else
      {
         echo "no";
         $item = $basket -> createItem('catalog', $productId);
         $item -> setFields(array(
            'QUANTITY' => $quantity,
            'CURRENCY' => Bitrix\Currency\CurrencyManager ::getBaseCurrency(),
            'LID' => Bitrix\Main\Context ::getCurrent() -> getSite(),
            'PRODUCT_PROVIDER_CLASS' => 'CCatalogProductProvider',
         ));


      }
      $basket -> save();
      echo "id=" . $item -> getId();// выводит 0
      echo $basket->isItemExists($item);    //    Существует ли такой товар в корзине
        $basket = $item->getCollection();    //    Корзина, которой принадлежит запись
      var_dump($basket->getListOfFormatText());