Gain insights into object-oriented programming in PHP. Discover classes, objects, methods, inheritance, and more. Build dynamic server-side applications using OOP techniques and PHP database management.

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Object-oriented programming is perhaps the dominant development paradigm for leading languages including Java, C#, and Python. The rich class and inheritance framework wasn’t fully implemented in modern PHP until 2015, and best practices for object-oriented programming are still emerging.

This course is an introduction to object-oriented programming in PHP. You’ll start with the basics of the OOP paradigm and get familiar with classes, objects, methods, and properties. You’ll then chain methods and properties using the this keyword before working with access modifiers and magic methods. With these basics down, you’ll take a deep dive into object-oriented programming in PHP, including inheritance, abstraction, polymorphism, and namespaces. After exploring exception handling, you’ll use these object-oriented techniques to build, manage, and edit a PHP database.

By the end of this course, you’ll be prepared to build dynamic server-side applications using object-oriented programming in PHP.

Object-Oriented Programming in PHP

# Limitations of object type hinting

Let’s consider a  scenario. A manager at a car rental company that rents only BMWs hires a programmer to write a program that calculates the price for a full tank of gas for each and every car that the company owns. In accordance with these demands, the programmer writes a class `Bmw` that holds the code for this task. This class has the relevant data about the BMWs, including the license plate number, car model, and most importantly, a method that calculates the volume of the fuel tank.

The function that calculates the volume is called `calcTankVolume()`. This method calculates the tank volume by multiplying the base area (the square of the base length) by the height. The height, the base length, and the license plate number are introduced to the class through the constructor.

Outside the class, the programmer writes a function `calcTankPrice()` to calculate the price for a full tank of gas by multiplying the tank volume by the price per gallon. However, since the programmer doesn’t want the function to get any arguments other than those that belong to the `Bmw` class, they use type hinting.


Learn about the limitations of object type hinting.

Introduction

Classes and Objects

Using the $this Keyword for Chaining Methods and Properties

Access Modifiers

Magic Methods and Constants Unveiled

Inheritance in Object-oriented Programming

Abstract Classes and Interfaces

Polymorphism and Type Hinting

Static Methods & Properties and Traits

Namespaces & Dependency Injection

Exception Handling

PHP Database

Model-view-controller (MVC)

Conclusion

Appendix

Limitations of Type Hinting for Objects

Limitations of object type hinting