Services_Twitterを使ってダイレクトメッセージ

gistfile1.php

<?php
//PEAR::Services_Twitter
require_once 'Services/Twitter.php';
//PEAR::HTTP_OAuth::Consumer
require_once 'HTTP/OAuth/Consumer.php';
//instance
$twitter = new Services_Twitter();
$oauth   = new HTTP_OAuth_Consumer($consumerKey, $consumerSecret, $authToken, $authTokenSecret);
$twitter->setOAuth($oauth);
//send new direct message
$twitter->direct_messages->new($user, $message);
?>