<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\IdentityGovernance\EntitlementManagement\Catalogs\Item\ResourceRoles\ResourceRolesRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new ResourceRolesRequestBuilderGetRequestConfiguration();
$queryParameters = ResourceRolesRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "(originSystem eq 'AadGroup' and resource/id eq 'a35bef72-a8aa-4ca3-af30-f6b2ece7208f')";
$queryParameters->expand = ["resource"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->identityGovernance()->entitlementManagement()->catalogs()->byAccessPackageCatalogId('accessPackageCatalog-id')->resourceRoles()->get($requestConfiguration)->wait();