为什么不在php中使用Google_Oauth2Service接收电子邮件地址呢？

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

$client = new Google_Client();
$client->setApplicationName('Your Application Name');
$client->setScopes(Google_Service_PeopleService::CONTACTS_READONLY);
$client->setAuthConfig('path/to/your/client_secret.json');
$client->setAccessType('offline');

$service = new Google_Service_PeopleService($client);

// 获取访问令牌
if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
    $client->setAccessToken($_SESSION['access_token']);
} else {
    $redirectUri = 'http://' . $_SERVER['HTTP_HOST'] . '/oauth2callback.php';
    header('Location: ' . filter_var($client->createAuthUrl(), FILTER_SANITIZE_URL));
    exit(1);
}

// 获取联系人
$contacts = $service->people->connections->listConnections('people/me', array(
    'personFields' => 'names,emailAddresses',
));

foreach ($contacts->getConnections() as $person) {
    if ($person->hasEmails()) {
        foreach ($person->getEmails() as $email) {
            echo $email->getValue() . "\n";
        }
    }
}
?>