Import Calendars, Events From Google Calendar Using PHP.

Problem: how to get Calendar events from Google Calendar.

Requirement:

1. Create event in google calander using link https://www.google.com/calendar
2. Event should be public so while creating any event set it as public at bottom of page.
3. Create new project on Google developer console and enable Google Calender API.
4. Set Redirect URIS: http://localhost/google_calendar/calendar.php
5. Set Javascript Origing: http://localhost

Solution:

Step 1: Create new folder in your root directory.

             E.g: var/www/google_calendar

             Then create another folder in this folder

             E.g: var/www/google_calender/google-api-php-client

Step 2: Open terminal.

            Go in to "google_calendar/google-api-php-client"   directory.

            E.g: cd /var/www/google_calendar/google-api-php-client

Step 3: Now copy and paste this link into terminal.

            git clone https://github.com/google/google-api-php-client.git

Step 4: Now create one php file in "var/www/google_calendar" folder.

            E.g: var/www/google_calendar/calendar.php

Step 5: Paste the following code in calender.php file

<?php
require_once 'google-api-php-client/autoload.php';

$client = new Google_Client();
// OAuth2 client ID and secret can be found in the Google Developers Console.
$client->setClientId('YOUR_CLIENT_ID');
$client->setClientSecret('YOUR_CLIENT_SECRET');
$client->setRedirectUri('http://localhost/google_calender/calendar.php');
$client->addScope('https://www.googleapis.com/auth/calendar');

$service = new Google_Service_Calendar($client);

$authUrl = $client->createAuthUrl();

//Request authorization
echo "<a href=$authUrl>Click Here to accept calenders</a>";
echo '<br>';
//$authCode = trim(fgets(STDIN));
$authCode = $_GET['code'];

// Exchange authorization code for access token
$accessToken = $client->authenticate($authCode);
$client->setAccessToken($accessToken);

echo '<br><br><b>Calender list.</b><br>';
$calendarList = $service->calendarList->listCalendarList();
$i=1;
while (true) {
    foreach ($calendarList->getItems() as $calendarListEntry) {
        echo '<p>'.$i.'=>'.$calendarListEntry->getSummary().'</p>';
        $i++;
    }
    $pageToken = $calendarList->getNextPageToken();
    if ($pageToken) {
        $optParams = array('pageToken' => $pageToken);
        $calendarList = $service->calendarList->listCalendarList($optParams);
    } else {
        break;
    }
}


echo '<br>';
echo '<b>Event List.</b><br>';
$events = $service->events->listEvents('primary');
$i=1;
while (true) {
    foreach ($events->getItems() as $event) {
        echo '<p>'.$i.'=>'.$event->getSummary().'</p>';
        $i++;
    }
    $pageToken = $events->getNextPageToken();
    if ($pageToken) {
        $optParams = array('pageToken' => $pageToken);
        $events = $service->events->listEvents('primary', $optParams);
    } else {
        break;
    }
}
?>

Now run the script.

For more methods of event please check following link.

https://developers.google.com/google-apps/calendar/v3/reference/events