Facebook star ratings on website - facebook

Question

I'm new to Facebook API and trying to get a page's star ratings on a web page, but not getting far...
<?php
require_once __DIR__ . '/vendor/autoload.php'; // change path as needed
$fb = new \Facebook\Facebook([
'app_id' => '{API_ID_HERE}',
'app_secret' => '{API_SECRET_HERE}',
'default_graph_version' => 'v2.10',
//'default_access_token' => '{ACCESS_TOKEN_HERE}', // optional
]);
/* PHP SDK v5.0.0 */
/* make the API call */
$request = new FacebookRequest(
$session,
'GET',
'/PAGE_ID_HERE/ratings'
);
$response = $request->execute();
$graphObject = $response->getGraphObject();
/* handle the result */
?>
I don't expect it too be right 100% but trying to a connection at least, but I keep getting;
Class 'FacebookRequest' not found
Which I've googled but not found anything constructive, I've got composer etc. but not sure what I'm missing
Cheers
Update
I found a solution to that error, but not getting a whole new one which doesn't make sense...
Notice: Undefined variable: session in C:\xampp\htdocs\phptests\php-graph-sdk\index.php on line 33
Warning: parse_url() expects parameter 1 to be string, array given in C:\xampp\htdocs\phptests\php-graph-sdk\src\Facebook\Url\FacebookUrlManipulator.php on line 109
Warning: parse_url() expects parameter 1 to be string, array given in C:\xampp\htdocs\phptests\php-graph-sdk\src\Facebook\Url\FacebookUrlManipulator.php on line 43
Fatal error: Call to undefined method Facebook\FacebookRequest::execute() in C:\xampp\htdocs\phptests\php-graph-sdk\index.php on line 41
<?php
require_once __DIR__ . '/vendor/autoload.php'; // change path as needed
use Facebook\FacebookRequest;
// PHP GRAPH SDK 5.5
function QueryToRetrieveUserThroughID(string $id) {
$newFacebook = new Facebook\Facebook([
'app_id' => '',
'app_secret' => '',
'default_graph_version' => 'v2.5',
]);
$newFacebookApp = $newFacebook->getApp();
$response = $newFacebook->get($id, '');
// or $response = $newFacebook->get($id);
$graphObject = $response->getGraphObject();
}
$request = new FacebookRequest(
$session,
'GET',
'//ratings',
array(
'fields' => 'rating'
)
);
$response = $request->execute();
$graphObject = $response->getGraphObject();
/* handle the result */
?>