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

# Task 

- Create a` User` class. Add a `protected` property named `$username` to the class and create a setter method that can set the value of the `$username`.
- Create a class named `Admin` that inherits the `User` class.
- Add a `public` method named `expressYourRole()` to the `Admin` class and make it return the class name.
- Add another `public` method named `sayHello()` to the `Admin` class. This method should return the string `Hello admin, XYZ` with the `$username` instead of `XYZ`.
- Inside the` test()` method, create an object `$admin1` of the class `Admin`, set its name to `Balthazar`, and say hello to the user.

# Coding exercise

Since these problems are designed for your practice,  try to solve them yourself first. If you get stuck, you can click the “Show Solution” button to see how the problem can be solved. Good luck!



# Task 

- Create a` User` class. Add a `protected` property named `＄username` to the class and create a setter method that can set the value of the `＄username`.
- Create a class named `Admin` that inherits the `User` class.
- Add a `public` method named `expressYourRole()` to the `Admin` class and make it return the class name.
- Add another `public` method named `sayHello()` to the `Admin` class. This method should return the string `Hello admin, XYZ` with the `＄username` instead of `XYZ`.
- Inside the` test()` method, create an object `＄admin1` of the class `Admin`, set its name to `Balthazar`, and say hello to the user.

# Coding exercise

Since these problems are designed for your practice,  try to solve them yourself first. If you get stuck, you can click the “Show Solution” button to see how the problem can be solved. Good luck!



Try to implement the concept of inheritance.

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

Challenge: Inheritance

Task