How to Add Event in Google Calendar Using PHP

Google Calendar has eliminated the use of a diary and pen to maintain a schedule. Also, events created in digital calendars make it possible to never miss an appointment!

Hence, integrating Google calendar with your business improves efficiency and time management.

If you are an online store owner where customers might need to book an appointment, I have curated a solution to add event in Google calendar using PHP.

With the below code you can add event to Google calendar and get notified for the same.

If your business is something like an online boutique appointment or treatment appointment, or simply you ask your customers to schedule an appointment before visiting, and you want to get notified of such events, use the below solution.

Method to Programmatically Add Event to Google Calendar:

<?php

class GoogleCalendarApi
{

    public function GetAccessTokenRefresh($client_id, $redirect_uri, $client_secret, $code)
    {
        $url = 'https://accounts.google.com/o/oauth2/token';

        $curlPost = 'client_id=' . $client_id . '&redirect_uri=' . $redirect_uri . '&client_secret=' . $client_secret . '&code=' . $code . '&grant_type=authorization_code';
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
        $data = json_decode(curl_exec($ch), true);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code != 200) {
            throw new Exception('Error : Failed to receieve access token');
        }
        return $data;
    }

    public function GetUserCalendarTimezone($access_token)
    {
        $url_settings = 'https://www.googleapis.com/calendar/v3/users/me/settings/timezone';

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url_settings);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Bearer ' . $access_token));
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        $data = json_decode(curl_exec($ch), true);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code != 200)
            throw new Exception('Error : Failed to get timezone');

        return $data['value'];
    }


    public function CreateCalendarEvent($calendar_id, $summary, $all_day, $event_time, $event_timezone, $access_token)
    {
        $url_events = 'https://www.googleapis.com/calendar/v3/calendars/' . $calendar_id . '/events';

        $curlPost = array('summary' => $summary);
        if ($all_day == 1) {
            $curlPost['start'] = array('date' => $event_time['event_date']);
            $curlPost['end'] = array('date' => $event_time['event_date']);
        } else {
            $curlPost['start'] = array('dateTime' => $event_time['start_time'], 'timeZone' => $event_timezone);
            $curlPost['end'] = array('dateTime' => $event_time['end_time'], 'timeZone' => $event_timezone);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url_events);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Bearer ' . $access_token, 'Content-Type: application/json'));
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($curlPost));
        $data = json_decode(curl_exec($ch), true);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code != 200)
            throw new Exception('Error : Failed to create event');

        return $data['id'];
    }

}

$capi = new GoogleCalendarApi();
const APPLICATION_ID = 'YOUR APPLICATION ID';
const APPLICATION_REDIRECT_URL = 'http://127.0.0.1:8081/magento236/add_event.php';
const APPLICATION_SECRET = 'c88TmBa5qo8cPAMMheV0agr9';

if(isset($_GET['code'])) {
    $CODE = $_GET['code'];
    $data = $capi->GetAccessTokenRefresh(APPLICATION_ID, APPLICATION_REDIRECT_URL, APPLICATION_SECRET, $CODE);
    $access_token = $data['access_token'];

    $user_timezone = $capi->GetUserCalendarTimezone($data['access_token']);
    $calendar_id = 'primary';
    $event_title = 'Event Title Meetanshi';

// Event starting & finishing at a specific time
    $full_day_event = 0;
    $event_time = ['start_time' => '2023-02-04T13:00:00', 'end_time' => '2023-02-04T13:15:00'];

// Full day event
    $full_day_event = 1;
    $event_time = ['event_date' => '2023-02-04'];

// Create event on primary calendar
    $event_id = $capi->CreateCalendarEvent($calendar_id, $event_title, $full_day_event, $event_time, $user_timezone, $data['access_token']);

    echo 'new event added';
    echo '</br>';
    echo 'event Id:-'.$event_id;

}else{

    $url =$login_url = 'https://accounts.google.com/o/oauth2/auth?scope=' . urlencode('https://www.googleapis.com/auth/calendar') . '&redirect_uri=' . APPLICATION_REDIRECT_URL . '&response_type=code&client_id=' . APPLICATION_ID . '&access_type=offline';

    echo '<a href="'.$url.'">click here add event</a>';
}


exit();