<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Groups\Item\TransitiveMembers\Graph\Group\GroupRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new GraphGroupRequestBuilderGetRequestConfiguration();
$headers = [
'ConsistencyLevel' => 'eventual',
];
$requestConfiguration->headers = $headers;
$queryParameters = GraphGroupRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->count = true;
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->groups()->byGroupId('group-id')->transitiveMembers()->graphGroup()->get($requestConfiguration)->wait();