<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Groups\Item\GroupItemRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new GroupItemRequestBuilderGetRequestConfiguration();
$queryParameters = GroupItemRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->select = ["allowExternalSenders","autoSubscribeNewMembers","isSubscribedByMail","unseenCount"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->groups()->byGroupId('group-id')->get($requestConfiguration)->wait();