app.php

<?php

require 'bootstrap.php';
use Abraham\TwitterOAuth\TwitterOAuth;

/* If access tokens are not available redirect to connect page. */
if (empty($_SESSION['access_token']) ||
    empty($_SESSION['access_token']['oauth_token']) ||
    empty($_SESSION['access_token']['oauth_token_secret'])
) {
    header('Location: ./clearsessions.php');
    exit;
}

/* Get user access tokens out of the session. */
$access_token = $_SESSION['access_token'];

/* Create a TwitterOauth object with consumer/user tokens. */
$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $access_token['oauth_token'], $access_token['oauth_token_secret']);

/* If method is set change API call made. Test is called by default. */
$user = $connection->get('account/verify_credentials', ['tweet_mode' => 'extended', 'include_entities' => 'true']);

// TODO: probably nothing of this is needed except the $tweets, maybe the $access_token?
$data = [
    'user' => $user,
];

echo $twig->render('app.html', $data);