How can I easily switch between PHP versions on Mac OSX?

Question

I would like to test my application on PHP 5.3 up to PHP 7.0.

Where and how can I install the versions and how can I switch them by running a small script?

Answer 1

Using brew

Show current version

$ php -v

Change to different version
(eg. changing from 5.5.x to version 7.0.latest) :

$ brew unlink php55
$ brew install php70