How to renew/extend facebook access tokens with PHP?

Question

Facebook has removed the offline_access token functionality, now tokens have to be renewed whenever the user visits your website to keep them active.

Say someone has

Answer 1

use Facebook\FacebookSession;
use Facebook\GraphSessionInfo;
use Facebook\FacebookRequest;
use Facebook\GraphUser;
use Facebook\FacebookRequestException;
use Facebook\FacebookRedirectLoginHelper;

    FacebookSession::setDefaultApplication('YOURAPPID', 'SECRET');

    $user_accessToken = $_COOKIE['access_token_facebook']

    $session = new FacebookSession($user_accessToken);

    try {
        $session->validate();
    } catch (FacebookRequestException $ex) {
        // When Facebook returns an error
        echo $ex->getMessage();
    } catch (\Exception $ex) {
        // When validation fails or other local issues
        echo $ex->getMessage();
    }
    if ($session) {
        // Exchange token for long token
        $longToken = $session->getExchangeToken();
        // ... your other stuff
    }

Ref: https://developers.facebook.com/docs/facebook-login/access-tokens#pagetokens https://developers.facebook.com/docs/facebook-login/access-tokens#extending