问如何让我的服务器使用PHP客户端库将事件添加到google日历？

EN

<?php
//
// built from example at:
// https://stackoverflow.com/questions/26064095/inserting-google-calendar-entries-with-service-account
//
$startdate = new DateTime('2015-01-29 10:00', new DateTimeZone('Europe/London'));
$startdate = $startdate->format('c');
$enddate = new DateTime('2015-01-29 10:00', new DateTimeZone('Europe/London'));
$enddate = $enddate->format('c');
//
// call function to add one event to the calendar (xxxxxxxxxxx@googlemail.com = the calendar owner)
//
calendarize('Test Appointment','Test appt description',$startdate,$enddate,'xxxxxxxxxxx@googlemail.com');

//-----------------------------------------------//
// funtion to add an event to my Google calendar //
//-----------------------------------------------//
function calendarize ($title, $desc, $start_ev_datetime, $end_ev_datetime, $cal_id) {
    session_start();
    require_once '../google-api-php-client-master/autoload.php';
    //Google credentials
    $client_id = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com';
    $service_account_name = 'xxxxxxxxxxxxxxxxxxxxxxxxxx@developer.gserviceaccount.com';
    $key_file_location = '../google-api-php-client-master/API Project-xxxxxxxxxx.p12';
    if (!strlen($service_account_name) || !strlen($key_file_location))
        echo missingServiceAccountDetailsWarning();
    $client = new Google_Client();
    $client->setApplicationName("Whatever the name of your app is");
    if (isset($_SESSION['service_token'])) {
        $client->setAccessToken($_SESSION['service_token']);
    }
    $key = file_get_contents($key_file_location);
    $cred = new Google_Auth_AssertionCredentials(
        $service_account_name,
        array('https://www.googleapis.com/auth/calendar'),
        $key
    );
    $client->setAssertionCredentials($cred);
    if($client->getAuth()->isAccessTokenExpired()) {
        try {
          $client->getAuth()->refreshTokenWithAssertion($cred);
        } catch (Exception $e) {
          var_dump($e->getMessage());
        }
    }
    $_SESSION['service_token'] = $client->getAccessToken();
    $calendarService = new Google_Service_Calendar($client);
    $calendarList = $calendarService->calendarList;
    //Set the Event data
    $event = new Google_Service_Calendar_Event();
    $event->setSummary($title);
    $event->setDescription($desc);
    $start = new Google_Service_Calendar_EventDateTime();
    $start->setDateTime($start_ev_datetime);
    $start->setTimeZone('Europe/London');
    $event->setStart($start);
    $end = new Google_Service_Calendar_EventDateTime();
    $end->setDateTime($end_ev_datetime);
    $end->setTimeZone('Europe/London');
    $event->setEnd($end);
    try {
      $createdEvent = $calendarService->events->insert($cal_id, $event);
    } catch (Exception $e) {
      var_dump($e->getMessage());
    }
    echo 'Event Successfully Added with ID: '.$createdEvent->getId();
}
?>