At first, include the PHP file, create a
  Net_WebFinger
  object and run
  finger()
  on it, passing the identifier
  (often the e-mail address, always user@host).
  finger() returns a
  Net_WebFinger_Reaction object
  which you can use to get links from.
 
<?php
require_once 'Net_WebFinger.php';
$wf = new Net_WebFinger();
$reaction = $wf->finger('user@example.org');
?>
Now you have access to the links, errors and security information.