PHP NetSuite API - get Customer records by internalID range - php

Question

I need to sync Customers from NetSuite to another system and would like to search Customers by internalId range, using the PHP library for the API. Given that the internalId's are autoincrement fields, I would only need Customers with internalId greater than the highest ID in the external system.
Is there a way to do this? If so, how?
I've currently only been able to iterate over ALL records, using the SearchRequest and SearchMoreWithIdRequest. A slight optimization I can do with this is to iterate over the pages in reverse order to avoid pulling too much duplicate data, but would prefer to filter by internalId (greater-than) if possible.
Thanks
here is existing code
/// initial search
$search = new CustomerSearchBasic();
$request = new SearchRequest();
$request->searchRecord = $search;
$searchResponse = $service->search($request);
// cache the search ID because we're gonna need to re-search, with pagination, using this id
$searchId = $searchResponse->searchResult->searchId;
$totalRecords = $searchResponse->searchResult->totalRecords;
// process the results
process_response($searchResponse);
// get subsequent pages
for ($page = 2; $page < ceil($totalRecords / $pageSize); $page++) {
echo "[page: $page] ... searchId: '$searchId'" . PHP_EOL;
if (!$searchId) continue;
$request = new SearchMoreWithIdRequest();
$request->searchId = $searchId;
$request->pageIndex = $page;
$searchResponse = $service->searchMoreWithId($request);
// process the results
process_response($searchResponse);
}
function process_response($searchResponse) { ... }