SOLID Example

How to use this codebase:

Option 1: for git aficionados

1. clone this repo and browse to its directory

2. git checkout step0 to get to the original code

3. follow along with git checkout step{n} for n=1..16

   Or, refactor it yourself and see how we compare!

Option 2: using GitHub's UI

1. Click the <> Code tab
2. Click 19 commits
3. Starting from Original PHP file at the bottom, click on each commit going up to see the changes