Consider phpfarm when need a dozen of PHP versions in parallel on a system

https://github.com/cweiske/phpfarm

Set of scripts to install a dozen of PHP versions in parallel on a system. It also creates a Pyrus installation for each PHP version. Primarily developed for PEAR's continuous integration machine.

In other words it's like pythonbrew for python developers, rvm or rbenv for ruby developer, n for node developer, etc.

I also created p which is n inspired shorcuts for phpfarm