I have been running some sites under a Shibboleth Service Provider for quite a long time. In some cases I had to modify applications written in PHP to be able to use Shibboleth authentication. But now I reached the point, when I had to implement Shibboleth authentication in my own application. Since I'm using Zend Framework for years, the natural way to achieve that was implementing a Shibboleth authentication adapter for the Zend_Auth component.
