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 with a protected `$username` property and methods that can set and get the `$username`.
- Create an `Author` interface with two abstract methods that can give the user an array of authorship privileges. The first method is `setAuthorPrivileges()` with the parameter `$array`, and the second method is `getAuthorPrivileges()`.
- Create an `Editor` interface with the method `setEditorPrivileges()` with the parameter `$array`, and another with the `getEditorPrivileges()` method to set and get the editor’s privileges.
- Create an `AuthorEditor` class that extends the `User` class and implements both the `Author` and the `Editor` interfaces.
- Add some methods in the `AuthorEditor` class that it should implement and the properties that these methods force us to add to the class.
- In the `test()` method, create an object named `$user1` from the class `AuthorEditor` and set its `$username` to `Balthazar`. Set an array of authorship privileges, including `write text` and `add punctuation`, in the `$user1` object. Set the editorial privileges `edit text`  and `edit punctuation` in the `$user1` object.
- Write code in the `test()` method to get and print the `$user1` name and privileges.

# Expected output
  ```
  Balthazar has the following privileges:  write text, add punctuation, edit text, edit punctuation,
  ```
# 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 with a protected `＄username` property and methods that can set and get the `＄username`.
- Create an `Author` interface with two abstract methods that can give the user an array of authorship privileges. The first method is `setAuthorPrivileges()` with the parameter `＄array`, and the second method is `getAuthorPrivileges()`.
- Create an `Editor` interface with the method `setEditorPrivileges()` with the parameter `＄array`, and another with the `getEditorPrivileges()` method to set and get the editor’s privileges.
- Create an `AuthorEditor` class that extends the `User` class and implements both the `Author` and the `Editor` interfaces.
- Add some methods in the `AuthorEditor` class that it should implement and the properties that these methods force us to add to the class.
- In the `test()` method, create an object named `＄user1` from the class `AuthorEditor` and set its `＄username` to `Balthazar`. Set an array of authorship privileges, including `write text` and `add punctuation`, in the `＄user1` object. Set the editorial privileges `edit text`  and `edit punctuation` in the `＄user1` object.
- Write code in the `test()` method to get and print the `＄user1` name and privileges.

# Expected output
  ```
  Balthazar has the following privileges:  write text, add punctuation, edit text, edit punctuation,
  ```
# 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!

Write a class and make it implement multiple interfaces along with 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: Interfaces

Task