In a new post today, Pádraic Brady takes a look at the OpenID library included in the Zend Framework and his own efforts to create functionality of his own.

Here in the present, everyone I work with is all too aware of OpenID. [...] Enter the Zend Framework. If you've ever looked under the hood of the JanRain PHP-Openid library you'll notice they implement all of this without a single dependency on PEAR or other external classes.

He notes that this application of the "Not Invented Here" method that the Zend Framework follows might not be the best when there are already plenty of libraries out there that help with this exact functionality. He mentions a PEAR class that helps with it, but is written in PHP4 and hasn't quite been optimized.