?? operator transform to ? ? how it fix?

[antaNTby]

    $row["productID"] = $productID ?  ? null;

    $row["min_order_amount"] = $Product["min_order_amount"] ?  ? 1;
    $row["real_instock"]     = $Product["myInStock"]["qnt"] ?  ? 1;

---

    $row["productID"] = $productID ?? null;

    $row["min_order_amount"] = $Product["min_order_amount"] ?? 1;
    $row["real_instock"]     = $Product["myInStock"]["qnt"] ?? 1;