OAuth.php

$configuration = array(
  'callbackUrl' => 'http://stats.local/twitter',
  'siteUrl' => 'https://api.twitter.com/oauth',
  'requestTokenUrl' => 'https://api.twitter.com/oauth/request_token',
  'authorizeUrl' => 'https://api.twitter.com/oauth/authorize',
  'accessTokenUrl' => 'https://api.twitter.com/oauth/access_token',	
  'consumerKey' => '',
  'consumerSecret' => ''
);
$consumer = new Zend_Oauth_Consumer($configuration);
$token = $consumer->getRequestToken();
$consumer->redirect();