PHP OOP - Understand Object Oriented Programming in PHP

Learn how to define a PHP class with properties like title, author, ISBN, and availability, use public visibility, and instantiate objects with the new keyword for a bookstore catalog.

Explore PHP's magic methods with a focus on the constructor and its automatic invocation when instantiating objects; learn to pass arguments to initialize properties.

Explore static properties and methods in PHP OOP, learn how to increment a class-wide id, access via self:: and the class name, and distinguish static from instance members.

Explore autoloading in PHP OOP by using a class-name based loader to automatically load files, and learn how this replaces manual requires behind the scenes.

Learn how inheritance works in PHP by using extends to inherit a parent’s properties and methods, with protected, public, and private access and constructor usage.

Explore abstract classes, how a parent enforces method implementation across child classes, and how basic and premium customers extend from customer and ultimately from person.

demonstrates declaring an abstract class in php, adding abstract methods, and forcing child classes like basic and premium to implement them, noting that abstract classes cannot be instantiated.

Explore PHP interfaces as contracts that declare public methods and properties, contrast with abstract classes, and show how implementing enforces methods in classes like basic and premium.

Learn how basic and premium classes extend a person base while implementing interfaces, and how interfaces can extend other interfaces to enforce methods like pay and taxes.