<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Sites\Item\Lists\Item\Items\Item\ListItemItemRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new ListItemItemRequestBuilderGetRequestConfiguration();
$queryParameters = ListItemItemRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->expand = ["fields"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->sites()->bySiteId('site-id')->lists()->byListId('list-id')->items()->byListItemId('listItem-id')->get($requestConfiguration)->wait();