EmeRails is a PHP web application framework I wrote circa February 2008 and improved and maintained since, taking inspiration from Ruby on Rails. It has a MVC architecture, has an ORM layer that mimics ActiveRecord, and separates presentation from business logic quite nicely, prioritizing conventions over configuration.
EmeRails supports page caching, action filtering and a lot of useful features that save coding time and server load. EmeRails is available on GitHub under the MIT license. I'm currently in the process of making it container-ready with Docker.