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

* Write an interface named `User`.
* Write a trait named `Writing` that contains an abstract method `writeContent()`.
* Add the `Author`, `Commentator`, and `Viewer` classes to implement the `User` interface.
* Use the `Writing` trait in the `Author` class and implement its abstract method by making it return the string `“Author, please start typing an article”`.
* Use the `Writing` trait in the `Commentator` class and implement its abstract method by making it return the string `“Commentator, please start typing your comment”`.
* In the `test()` method, create `Author` and `Commentator` class objects and call the `writeContent()` method to return the following output.

# Expected output
  ```Console
  Author, please start typing an article and Commentator, please start typing your comment
  ```
# 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!


Create an interface and traits, and then use them in child classes.


Challenge: Static Methods & Properties and Traits

Create an interface and traits, and then use them in child classes.

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: Static Methods & Properties and Traits

Task