InternalID cannot be converted

Hi,

Need help, I'm trying to get the internalID of records from a saved search using PHP.

But this error appear.
Object of class RecordRef could not be converted to string

Below is my code.

include_once 'NetSuiteService.php';

$service = new NetSuiteService();
$search = new TransactionSearchAdvanced();
$search->savedSearchId = "586"; //Search internal ID

$request = new SearchRequest();
$request->searchRecord = $search;
$searchResponse = $service->search($request);

//print_r($searchResponse);
var_dump($searchResponse);
$rec = count($searchResponse->searchResult->totalRecords);
$record = $searchResponse->searchResult->searchRowList->searchRow;
echo "<br>";
if($rec > 0){
foreach ($record as $records) {
  echo "InternaldID:" . $records->basic->internalId[0]->searchValue ."<br>";