I am considering implementing OpenID on my website and I am having a hard time finding good resources for OpenID implementation in php. So far I have only found RPX but I don't want to depend on third party vendors. I want something similar to SO , can anyone point me in the right direction and can you also tell approximately how much time will it take to implement OpenID on my web site.
What about Simple OpenID via php classes.org? http://www.phpclasses.org/browse/package/3290.html