如何检索Google Calendar Resources PHP API客户端？

composer require google/apiclient:^2.0

require 'vendor/autoload.php';

$client = new Google_Client();
$client->setApplicationName("Google Calendar API Sample");
$client->setScopes(Google_Service_Calendar::CALENDAR_READONLY);
$client->setAuthConfig('path/to/your/credentials.json');
$client->setAccessType("offline");

// Load previously authorized token from a file, if it exists.
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
$tokenPath = 'path/to/token.json';
if (file_exists($tokenPath)) {
    $accessToken = json_decode(file_get_contents($tokenPath), true);
    $client->setAccessToken($accessToken);
}

// If there is no previous token or it's expired.
if ($client->isAccessTokenExpired()) {
    // Refresh the token if possible, else fetch a new one.
    if ($client->getRefreshToken()) {
        $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
    } else {
        // Request authorization from the user.
        $authUrl = $client->createAuthUrl();
        printf("Open the following link in your browser:\n%s\n", $authUrl);
        print 'Enter verification code: ';
        $authCode = trim(fgets(STDIN));

        // Exchange authorization code for an access token.
        $accessToken = $client->fetchAccessTokenWithAuthCode($authCode);
        printf("Refresh token: %s\n", $client->getRefreshToken());

        // Save the token to a file.
        if (!file_exists(dirname($tokenPath))) {
            mkdir(dirname($tokenPath), 0700, true);
        }
        file_put_contents($tokenPath, json_encode($accessToken));
        printf("Saved access token in %s\n", $tokenPath);
    }
    $client->setAccessToken($accessToken);
}

// Create API client and service object.
$service = new Google_Service_Calendar($client);

$calendarList = $service->calendarList->listCalendarList();
while ($calendarList->getNextPageToken() != null) {
    $calendarPages = $service->calendarList->listCalendarList($calendarList->getNextPageToken());
    foreach ($calendarPages as $calendar) {
        echo "Calendar: " . $calendar->getSummary() . "
";
    }
}