通过php代码访问我的outlook收件箱

<?php
require_once 'vendor/autoload.php';

use Microsoft\Graph\Graph;
use Microsoft\Graph\Model;

$clientId = 'YOUR_CLIENT_ID';
$clientSecret = 'YOUR_CLIENT_SECRET';
$tenantId = 'YOUR_TENANT_ID';

$guzzle = new \GuzzleHttp\Client();

$graph = new Graph();
$graph->setHttpClient($guzzle);
$graph->setAccessToken(getAccessToken());

$messages = $graph->createRequest('GET', '/me/mailfolders/inbox/messages')
    ->setReturnType(Model\Message::class)
    ->execute();

foreach ($messages as $message) {
    echo 'Subject: ' . $message->getSubject() . '<br>';
    echo 'Sender: ' . $message->getFrom()->getEmailAddress()->getName() . '<br>';
    echo 'Received: ' . $message->getReceivedDateTime()->format('Y-m-d H:i:s') . '<br>';
    echo '------------------------<br>';
}

function getAccessToken() {
    global $clientId, $clientSecret, $tenantId, $guzzle;

    $tokenEndpoint = 'https://login.microsoftonline.com/' . $tenantId . '/oauth2/v2.0/token';

    $response = $guzzle->post($tokenEndpoint, [
        'form_params' => [
            'client_id' => $clientId,
            'client_secret' => $clientSecret,
            'scope' => 'https://graph.microsoft.com/.default',
            'grant_type' => 'client_credentials'
        ]
    ]);

    $responseData = json_decode($response->getBody(), true);
    return $responseData['access_token'];
}
?>