<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Policies\RoleManagementPolicies\RoleManagementPoliciesRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new RoleManagementPoliciesRequestBuilderGetRequestConfiguration();
$queryParameters = RoleManagementPoliciesRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "scopeId eq '/' and scopeType eq 'DirectoryRole'";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->policies()->roleManagementPolicies()->get($requestConfiguration)->wait();