<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Users\Item\Chats\GetAllMessages\GetAllMessagesRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new GetAllMessagesRequestBuilderGetRequestConfiguration();
$queryParameters = GetAllMessagesRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->top = 2;
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->users()->byUserId('user-id')->chats()->getAllMessages()->get($requestConfiguration)->wait();