Adding events to google calendar api PHP?

Question

PHP

I want to write events to my calendar using the API
Gives an error

Fatal error: Uncaught exception 'Google_Service_Exception' with message '{ "error": { "errors": [ { "domain": "global", "reason": "authError", "message": "Invalid Credentials", "locationType ": "header", "location": "Authorization" } ], "code": 401, "message": "Invalid Credentials" } }

I do it on the local host, everything is according to the instructions from the Google site. It’s not possible to write it down, it displays events from the calendar, but it doesn’t record it.

<?php
require __DIR__ . '/vendor/autoload.php';
/**
 * Returns an authorized API client.
 * @return Google_Client the authorized client object
 */
function getClient()
{
    $client = new Google_Client();
    $client->setApplicationName('Google Calendar API PHP Quickstart');
    $client->setScopes(Google_Service_Calendar::CALENDAR_READONLY);
    $client->setAuthConfig('client_secret.json');
    $client->setAccessType('offline');
    // Load previously authorized credentials from a file.
    $credentialsPath = expandHomeDirectory('credentials.json');
    if (file_exists($credentialsPath)) {
        $accessToken = json_decode(file_get_contents($credentialsPath), true);
    } 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);
        // Store the credentials to disk.
        if (!file_exists(dirname($credentialsPath))) {
            mkdir(dirname($credentialsPath), 0700, true);
        }
        file_put_contents($credentialsPath, json_encode($accessToken));
        printf("Credentials saved to %s\n", $credentialsPath);
    }
    $client->setAccessToken($accessToken);
    // Refresh the token if it's expired.
    if ($client->isAccessTokenExpired()) {
        $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
        file_put_contents($credentialsPath, json_encode($client->getAccessToken()));
    }
    return $client;
}
/**
 * Expands the home directory alias '~' to the full path.
 * @param string $path the path to expand.
 * @return string the expanded path.
 */
function expandHomeDirectory($path)
{
    $homeDirectory = getenv('HOME');
    if (empty($homeDirectory)) {
        $homeDirectory = getenv('HOMEDRIVE') . getenv('HOMEPATH');
    }
    return str_replace('~', realpath($homeDirectory), $path);
}

// Get the API client and construct the service object.

$client = getClient();
$service = new Google_Service_Calendar($client);
$event = new Google_Service_Calendar_Event(array(
        'summary' => 'Google I/O 2015',
        'location' => '800 Howard St., San Francisco, CA 94103',
        'description' => 'A chance to hear more about Google\'s developer products.',
'start' => array(
'dateTime' => '2015-05-28T09:00:00-07:00',
'timeZone' => 'America/Los_Angeles',
),
'end' => array(
'dateTime' => '2015-05-28T17:00:00-07:00',
'timeZone' => 'America/Los_Angeles',
),
'recurrence' => array(
'RRULE:FREQ=DAILY;COUNT=2'
),
'attendees' => array(
array('email' => '[email protected]'),
array('email' => '[email protected]'),
),
'reminders' => array(
'useDefault' => FALSE,
'overrides' => array(
  array('method' => 'email', 'minutes' => 24 * 60),
  array('method' => 'popup', 'minutes' => 10),
  ),
),
));

$calendarId = 'primary';
$event = $service->events->insert($calendarId, $event);
?>