<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Drives\Item\Items\Item\Content\ContentRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new ContentRequestBuilderGetRequestConfiguration();
$queryParameters = ContentRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->format = "{format}";
$requestConfiguration->queryParameters = $queryParameters;
$graphServiceClient->drives()->byDriveId('drive-id')->items()->byDriveItemId('driveItem-id')->content()->get($requestConfiguration)->wait();