<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\DriveItem;
use Microsoft\Graph\Beta\Generated\Models\Folder;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new DriveItem();
$requestBody->setName('New Folder');
$folder = new Folder();
$requestBody->setFolder($folder);
$additionalData = [
'@microsoft.graph.conflictBehavior' => 'rename',
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->drives()->byDriveId('drive-id')->items()->byDriveItemId('driveItem-id')->children()->post($requestBody)->wait();