fahdi/wp-oop

Object-Oriented Programming (OOP) in WordPress - A Beginner's Guide

Welcome to the OOP in WordPress guide. This guide will help you understand the fundamental concepts of object-oriented programming within the WordPress ecosystem.

Introduction

Object-Oriented Programming (OOP) is a programming paradigm that uses "objects" to design applications and programs. The main concepts of OOP are:

1. Classes and Objects
2. Encapsulation
3. Inheritance
4. Polymorphism
5. Abstraction

Table of Contents

1. Classes and Objects

   • Introduction to Classes and Objects
   • Defining a Class
   • Creating Objects
   • Using Constructors
   • Class Methods
   • Properties
   • Static Properties and Methods
   • Constants
   • Example: Custom Post Type Class
   • Example: Shortcode Class
   • Example: Widget Class
   • Example: Admin Page Class

2. Encapsulation

   • Introduction to Encapsulation
   • Public, Private, and Protected Access Modifiers
   • Getters and Setters
   • Example: Encapsulating Custom Post Type Logic
   • Example: Encapsulating Widget Logic

3. Inheritance

   • Introduction to Inheritance
   • Simple Inheritance
   • The parent Keyword
   • Overriding Methods
   • Final Keyword
   • Traits
   • Example: Extending the WP_Widget Class
   • Example: Creating a Base Class for Admin Pages

4. Polymorphism

   • Introduction to Polymorphism
   • Method Overriding
   • Interfaces
   • Abstract Classes and Methods
   • Example: Interface for Custom Post Types
   • Example: Abstract Class for Reusable Components

5. Abstraction

   • Introduction to Abstraction
   • Abstract Classes
   • Abstract Methods
   • Example: Abstract Class for Admin Pages
   • Implementing Abstract Methods

6. Namespaces

   • Introduction to Namespaces
   • Defining Namespaces
   • Using Namespaces
   • Namespace Aliases
   • Example: Organizing Plugin Code with Namespaces

7. Exception Handling

   • Introduction to Exception Handling
   • Try, Catch, and Finally
   • Custom Exceptions
   • Example: Handling Exceptions in a Plugin

8. Design Patterns

   • Introduction to Design Patterns
   • Singleton Pattern
   • Factory Pattern
   • Observer Pattern
   • Strategy Pattern
   • Example: Using Design Patterns in WordPress

9. Real-World Applications

   • Building a Custom Post Type Plugin
   • Creating a Custom Widget
   • Developing a Shortcode Plugin
   • Building an Admin Page Plugin