At our company, our main web app is based on Symfony 1.0, a PHP framework released in 2008. It was developped by a company called Sensio and open-sourced shortly after. It was a great framework when it came out, with all the good ideas from Ruby On Rails, CakePHP, etc. as well as great documentation, tutorials and a growing community. It is completely MVC, lets you write clean code, and does a lot of things a modern framework is supposed to let you do. But version 1.0 is clearly obsolete, and it is still our main framework.