At present time PHP has many open sources so it has become a tough task to choose a perfect open sources, then ruby on rails can be a better option for you because Ruby on rails includes tools that makes common development task easier. Ruby on rails allow you to transition from idea to implementation from in a very short period of time.
Ruby on rails is one of the finest open source for PHP. It lets you write beautiful code by favoring convention over configuration. Ruby is a general purpose programming language, on which ruby on rails runs.
Rails is a full-stack framework. Rails provide full facility to gather information from the web server, querying to the database as a result Rails comprises a routing system that is independent on the web server so the result comes very fast.
Ruby on Rails have many advantages like integrated testing, interchangeable database, offers a new query engine, Database Schema Control, improved security and the most important, it provides a lot less code. Therefore it has become one of the best open source web application frameworks. Ruby on rails provides a fast and secure website.
So if you are searching an open source of PHP which can give you a fast and secure result then ruby on rails is a good option for you.