Authentication with Zend Framework Darby Felton PHP Developer, Zend Technologies Zend Framework facilitates development of PHP applications requiring authentication by providing a simple, object-oriented API and adapters for popular authentication mechanisms.
OpenID is a decentralized single sign-on system. Using OpenID-enabled sites, web users do not need to remember traditional authentication tokens such as username and password. Instead, they only need to be previously registered on a website with an OpenID "identity provider" (IdP). Since OpenID is decentralized, any website can employ OpenID software as a way for users to sign in; OpenID solves the problem without relying on any centralized website to confirm digital identity.