Joe Ferguson has a new post to his site showing you how to install PHP 7.1 on a Cloud9 workspace to get the latest features of PHP (they run PHP 5.5 by default).

July 8th I’m giving a general PHP training day at the Fedex Institute of Technology and because I’m targeting absolute beginners I wanted to use Cloud 9. Cloud 9 is an online editor that gives you a full linux workspace to build your project in. The first thing I noticed was the container Cloud 9 provides is running PHP 5.5.

He provides the contents of the bash script you can run via the Cloud9 interface that will install PHP 7.1 and several dependencies. It also updates a few configurations to work with PHP 7.1 and restarts the Apache instance to have it all take effect. He's posted this as a repository on GitHub to make it even easier and shows how to set up the Cloud9 workspace using it as a base.