callback.php

<?php
session_start();

require_once('lib/OAuth.php');
require_once('lib/twitteroauth.php');
define('CONSUMER_KEY', 'tQHzwXnuQ7yZrEdRVqpQZuouD');
define('CONSUMER_SECRET', '5Z8VA2KU0gvqfyMqfwuLIiXnHH0d58e04fWP9OO2jOQRWzamPl');
define('OAUTH_CALLBACK', '	http://saurabh.ueuo.com/callback.php');

if (isset($_REQUEST['oauth_verifier'], $_REQUEST['oauth_token']) && $_REQUEST['oauth_token'] == $_SESSION['request_token']) {
	$request_token = [];
	$request_token['oauth_token'] = $_SESSION['request_token'];
	$request_token['oauth_token_secret'] = $_SESSION['request_token_secret'];
	$connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $request_token['oauth_token'], $request_token['oauth_token_secret']);
	$access_token = $connection->getAccessToken($_REQUEST['oauth_verifier']);
	$_SESSION['access_token'] = $access_token;
	header('Location: ' . 'home.php');
}
?>