<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\IdentityGovernance\AccessReviews\Definitions\Item\Instances\InstancesRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new InstancesRequestBuilderGetRequestConfiguration();
$queryParameters = InstancesRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->top = 100;
$queryParameters->skip = 0;
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->identityGovernance()->accessReviews()->definitions()->byAccessReviewScheduleDefinitionId('accessReviewScheduleDefinition-id')->instances()->get($requestConfiguration)->wait();