/**
 * @param $auction DbAuction
 * @param $userIds array
 * @return mixed
 */
function listUserIdsWithoutAuctionOwner($auction, $userIds)
{
    $item = DbItem::find($auction->getField("itemId"));
    $ownerId = DbUser::find($item->getField("userId"))->getId();
    $key = array_search($ownerId, $userIds);
    unset($userIds[$key]);
    return $userIds;
}