Zend_Auth_Adapter_OpenId adapter can be used to authenticate
users using remote OpenID servers. This authentication method assumes that the user
submits only their OpenID identity to the web application. They are
then redirected to their OpenID provider to prove identity ownership
using a password or some other method. This password is never provided to
the web application.
The OpenID identity is just a URI that points to a web site with information about a user, along with special tags that describes which server to use and which identity to submit there. You can read more about OpenID at the OpenID official site.
Zend_Auth_Adapter_OpenId class wraps
Zend_OpenId_Consumer component, which implements the
OpenID authentication protocol itself.
Zend_OpenId takes advantage of the GMP extension, where available. Consider
enabling the GMP extension for better performance when using