Basic Example of Google Calendar API using Google API PHP Client - google-calendar-api

Question

I have a property website where I have listed multiple properties. Each property has a Google Calendar and when the property is booked on that particular day, then a note is added on that day for that particular calendar.
I was doing all this manually, where I was updating the HTML of the website by showing the availability with a layout like this.
Now I am trying to make all this automated by using the Google Calendar API where I can display the booking of each property in a calendar like the example above.
I am trying to use the Google API PHP Client Library which is located at https://github.com/google/google-api-php-client
My biggest problem here is that I am unable to find any basic example of this also over the internet. Google pages are not showing the full examples.
For example, the guide page of Google shows just one example of "books", which I don't need at all.
I have searched all over the internet for some basic examples of the code but unable to find it at all. I search stackoverflow itself but all the codes that I have find are really confusing and all of them are different.
Moreover, most of them already "know" about it so there is no way to understand what is required.
If someone has a simple example where I can pull events of a day of a calendar, please post it here.
Also if you know of some other way to display the availability like the image above, would be great help !
Thanks.

Answer 1

What the heck, I'll repost an answer I gave from this question:
if($refresh_token_accessed_from_my_database) {
//If session contains no valid Access token, get a new one
if ($client->isAccessTokenExpired()) {
$client->refreshToken($refresh_token_accessed_from_my_database);
}
//We have access token now, launch the service
$this->service = new Google_Service_Calendar($client);
}
else {
//User has never been authorized, so let's ask for the ok
if (isset($_GET['code'])) {
//Creates refresh and access tokens
$credentials = $client->authenticate($_GET['code']);
//Store refresh token for further use
//I store mine in the DB, I've seen others store it in a file in a secure place on the server
$refresh_token = $credentials['refresh_token'];
//refresh_token->persist_somewhere()
//Store the access token in the session so we can get it after
//the callback redirect
$_SESSION['access_token'] = $client->getAccessToken();
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}
if (!isset($_SESSION['access_token'])) {
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
}
if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
$client->setAccessToken($_SESSION['access_token']);
$this->service = new Google_Service_Calendar($client);
}
When I built my project I started from the tutorial Morfinismo post in the comments, but I had a couple of problems following that one. I've made comments to describe the general flow and some potential problem points, you may want to compare those notes with the other tutorial if you're not too clear about what is going on.