<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\RoleManagement\EntitlementManagement\RoleAssignments\RoleAssignmentsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new RoleAssignmentsRequestBuilderGetRequestConfiguration();
$queryParameters = RoleAssignmentsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "appScopeId eq '/AccessPackageCatalog/4cee616b-fdf9-4890-9d10-955e0ccb12bc'";
$queryParameters->expand = ["principal"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->roleManagement()->entitlementManagement()->roleAssignments()->get($requestConfiguration)->wait();