This code uses an older version of the Toolkit.
The 2013_1 version is much, much better and easier to use. Also, be careful which endpoint the Toolkit points toward, as older versions, like 2009_2 are no longer supported.
The code when using the 2013_1 version of the Toolkit is simple:
$service = new NetSuiteService();
$search = new ItemSearchAdvanced();
$search->savedSearchId = "XX"; //replace with your internal ID
$request = new SearchRequest();
$request->searchRecord = $search;
$searchResponse = $service->search($request);