<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\RoleManagement\Defender\RoleAssignments\RoleAssignmentsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new RoleAssignmentsRequestBuilderGetRequestConfiguration();
$queryParameters = RoleAssignmentsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "roleDefinitionId eq 'b5c08161-a7af-481c-ace2-a20a69a48fb1'";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->roleManagement()->defender()->roleAssignments()->get($requestConfiguration)->wait();