% pear install --alldeps Services_Twitter-alpha
You can get some sample codes for Services_Twitter with OAuth from php doc, but it’s not a complete code. I rewrite some parts.
<?php
if (isset($_GET['clear'])) { // sometimes you need to clear session, just access ?clear=1
session_start();
$_SESSION = array();
session_destroy();
[...]
Complete working sample for Services_Twitter OAuth in PHP PEAR