Refactoring PHP
Refactoring is the process of modifying and restructuring code without changing its functionality. When I first heard about it, I was like: Why would anyone do that? It took some years until I fully understood the concept and that the working code is not always good. So with refactoring, you can make working code better, and what better means is something developers will argue for hours. In the end, you have to define it for yourself.