Object Oriented Programming

languages like java are purely OOP

PHP is a scripting language that has a bit of HTML, OOP and logic

Basic OOP

Drupal started at a time when object oriented programming ...

4 basic Principles of OOP

1. Polymorphism
2. Abstraction
3. Encapsulation
4. Inheritance

Glossary

Class - An encapsulation of some functionality

Subclass - An extension to a base class that inherits the base classy functionality but adds more

Property - A property of a class that represents a value

Function - Some logic that either modifies a property or returns some value

Exercise

Create shape classes in PHP

<?php

//base class
class Shape {

declare the base class. Other classes can be declared within this with different values

const SHAPE_TYPE = 1;

protected means that the value cannot be changed

private means that the value can be changed but it can't be accessed directly.

interface is an abstract class....

Class

In an object oriented programming a class is like a template or/ boiler plate for an object. An object in an instance of a class. The class doesn't exist until the an instance or the object is created.

So for example