Requires PHP 5.3.0 or newer!
Use the API by instantiating it, and then calling the method through dotted notation chaining:
require('disqusapi/disqusapi.php');
$disqus = new DisqusAPI($secret_key);
$disqus->trends->listThreads();
Parameters (including the ability to override version, api_secret, and format) are passed as keyword arguments to the resource call:
$disqus->posts->details(array('post'=>1, 'version'=>'3.0'));
Documentation on all methods, as well as general API usage can be found at http://disqus.com/api/