<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Users\Item\CalendarView\CalendarViewRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new CalendarViewRequestBuilderGetRequestConfiguration();
$queryParameters = CalendarViewRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->startDateTime = "2020-01-01T19:00:00-08:00";
$queryParameters->endDateTime = "2020-01-02T19:00:00-08:00";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->me()->calendarView()->get($requestConfiguration)->wait();