If you are a developer, chances are very good that you know what Object-Oriented (OO) code is. You might have also heard about OO Design Patterns, things like single responsibilities, decoupled code, and my subject here: Dependency Injection (DI).
OO Design patterns help you write code that is easier to change, and easier to test. Being quite abstract concepts, they apply to many modern programming languages, including Java, Ruby and PHP. Each language has its own way to do things, thus each language implements the concepts in a different way. Some implementations are similar, others not so much. In this article I’ll talk about Dependency Injection with a special focus on web development. I’ll explain what DI is, and I’ll elaborate on Ruby’s implementation. Finally, I’ll compare the Ruby approach with PHP’s view on DI.