Count Google Calendars

count_calendars.php

<?php

require __DIR__ . '/vendor/autoload.php';

$credentials_path = __DIR__ . '/credentials.json';

putenv("GOOGLE_APPLICATION_CREDENTIALS=$credentials_path");

$client = new Google_Client;
$client->useApplicationDefaultCredentials();
$client->setScopes(Google_Service_Calendar::CALENDAR_READONLY);

$service = new Google_Service_Calendar($client);

$cals = $service->calendarList->listCalendarList();

echo count($cals), PHP_EOL;