<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Devices\Item\DeviceItemRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new DeviceItemRequestBuilderGetRequestConfiguration();
$queryParameters = DeviceItemRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->select = ["id","extensionAttributes"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->devices()->byDeviceId('device-id')->get($requestConfiguration)->wait();