What is the design pattern for WordPress Core?

Question

What is the design pattern of WordPress Core? As this Stack Overflow question shows, WordPress does not follow the MVC pattern; however, developers can write plugins and themes that follow MVC. But my question pertains exclusively to WordPress Core, not to any additional add-ons, themes, extensions, plugins, or forked projects that may or may not follow an MVC pattern.

If WordPress Core does not follow an MVC design, then what design pattern does it follow?

Answer 1

Spaghetti with meatballs

The term "spaghetti with meatballs" is a pejorative term used in computer science to describe loosely constructed object-oriented programming (OOP) that remains dependent on procedural code. It may be the result of a system whose development has included a long life cycle, language constraints, micro-optimization theatre, or a lack of coherent coding standards.

It also has a bit of macaroni mixed in...

http://en.wikipedia.org/wiki/Spaghetti_code#Spaghetti_with_meatballs

Answer 2

WordPress uses the Event Driven Architecture due to action/hook API.

Answer 3

I think it is a singleton design pattern, as there is base class and base object called $wp which is global object.