Can't create an event using google calendar api php - php

Question

I've followed all the instructions, the php quickstart and the events.insert pages by google; but when i run it the consent form pops up I click allow and then nothing happens bar the consent form resetting.If i change the redirect url to another page then it no longer resets the consent form, but still nothing happens.
$client = new Google_Client();
$client->setAuthConfig('redacted');
$client->addScope("https://www.googleapis.com/auth/calendar");
$client->addScope("https://www.googleapis.com/auth/calendar.events");
$client->setRedirectUri('http://redacted/GoogleClientWorksCalendar.php');//this is the current file
$client->setAccessType('offline');
$client->setIncludeGrantedScopes(true);
$client->setPrompt('consent');
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
$service = new Google_Service_Calendar($client);
$event = new Google_Service_Calendar_Event(array(
'summary' => 'test',
'location' => 'somewhere',
'description' => 'test description',
'start' => array(
'dateTime' => '2020-09-03T09:00:00+02:00',
),
'end' => array(
'dateTime' => '2020-09-03T17:00:00+02:00',
),
));
$calendarId = 'redacted';
$results = $service->events->insert($calendarId, $event);
Thank you.

Answer 1

I have resolved my issue. The problem was I had forgotten a part of the google Oauth2.0 code required, which meant I never received the access token.
This snippet below is fully functional. Hope it helps and thank you all for answering.
$client = new Google_Client();
$client->setAuthConfig('redacted');
$client->addScope("https://www.googleapis.com/auth/calendar");
$client->addScope("https://www.googleapis.com/auth/calendar.events");
$client->setRedirectUri('http://redacted/GoogleClientWorksCalendar.php');//this is the current file
$client->setAccessType('offline');
$client->setIncludeGrantedScopes(true);
$client->setPrompt('consent');
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
$client->authenticate($_GET['code']);
$access_token = $client->getAccessToken();
$client->setAccessToken($access_token);
$service = new Google_Service_Calendar($client);
$event = new Google_Service_Calendar_Event(array(
'summary' => 'test',
'location' => 'somewhere',
'description' => 'test description',
'start' => array(
'dateTime' => '2020-09-03T09:00:00+02:00',
),
'end' => array(
'dateTime' => '2020-09-03T17:00:00+02:00',
),
));
$calendarId = 'redacted';
$results = $service->events->insert($calendarId, $event);