JTwitter test

twitter_test.php

<?php
// We are a valid Joomla entry point.
define('_JEXEC', 1);

// Setup the base path related constant.
define('JPATH_BASE', dirname(__FILE__));

// Maximise error reporting.
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Bootstrap the application.
require dirname(__FILE__).'/bootstrap.php';

class TwitterApp extends JApplicationWeb
{
	/**
	 * Display the application.
	 */
	function doExecute(){
		$key = "lIio7RcLe5IASG5jpnZrA";
		$secret = "dl3BrWij7LT04NUpy37BRJxGXpWgjNvMrneuQ11EveE";
		$my_url = JUri::current();

		$option = new JRegistry;
		$option->set('consumer_key', $key);
		$option->set('consumer_secret', $secret);
		$option->set('callback', $my_url);
		$option->set('sendheaders', true);

		$oauth = new JTwitterOAuth($option);

		//$access_token = $obj->getStoredToken();
		//$oauth->setToken($access_token);

		$new_token = $oauth->authenticate();

		// Store the new access token.
		/*if ($new_token != $access_token)
		{
			$obj->storeToken($new_token);
		}*/

		$twitter = new JTwitter($oauth);

		$friends = $twitter->friends;
		//$response = $friends->getFriendshipsLookup('testuse70078234');

		$statuses = $twitter->statuses;
		$response = $statuses->tweet('Testing JTwitter code.');

		print_r($response);
	}
}

$web = JApplicationWeb::getInstance('TwitterApp');
JFactory::$application = $web;

$session = JFactory::getSession();
if($session->isActive() == false){
	$session->initialise(JFactory::getApplication()->input);
	$session->start();
}

// Run the application
$web->execute();

but you can do a module to test, because i test your code and appear me error 500 :( help me plz