<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Compliance\Ediscovery\Cases\Item\ReviewSets\Item\MicrosoftGraphEdiscoveryExport\ExportPostRequestBody;
use Microsoft\Graph\Beta\Generated\Models\Ediscovery\ExportOptions;
use Microsoft\Graph\Beta\Generated\Models\Ediscovery\ExportFileStructure;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new ExportPostRequestBody();
$requestBody->setOutputName('2020-12-06 Contoso investigation export');
$requestBody->setDescription('Export for the Contoso investigation');
$requestBody->setExportOptions(new ExportOptions('originalFiles,fileInfo,tags'));
$requestBody->setExportStructure(new ExportFileStructure('directory'));
$graphServiceClient->compliance()->ediscovery()->cases()->byCaseId('case-id')->reviewSets()->byReviewSetId('reviewSet-id')->microsoftGraphEdiscoveryExport()->post($requestBody)->wait();