<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Drives\Item\Items\Item\Workbook\Names\Item\Range\Merge\MergePostRequestBody;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new MergePostRequestBody();
$requestBody->setAcross(true);
$graphServiceClient->drives()->byDriveId('drive-id')->items()->byDriveItemId('driveItem-id')->workbook()->names()->byWorkbookNamedItemId('workbookNamedItem-id')->range()->merge()->post($requestBody)->wait();