<?php require 'openid.php'; try { # Change 'localhost' to your domain name. $openid = new LightOpenID('localhost'); if(!$openid->mode) { if(isset($_POST['openid_identifier'])) { $openid->identity = $_POST['openid_identifier']; header('Location: ' . $openid->authUrl()); } ?> <form action="" method="post"> OpenID: <input type="text" name="openid_identifier" /> <button>Submit</button> </form> <?php } elseif($openid->mode == 'cancel') { echo 'User has canceled authentication!'; } else { echo 'User ' . ($openid->validate() ? $openid->identity . ' has ' : 'has not ') . 'logged in.'; } } catch(ErrorException $e) { echo $e->getMessage(); }