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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` interface with setter and getter methods for the `$username` and `$gender` properties.

* Now, create a `Commentator` class to implement the `User` interface.

* Create a function to add `Mr.` or `Mrs.` to the username. When you’re writing the function, make sure to type hint it correctly so it can only get the types it is expected to.

* In the `test()` method, create a user with the name `Jane` and against another user with the name `Bob`. Use this function to return their names with an appropriate salutation.


## Expected output
  ```
  Mrs. Jane and Mr. Bob
  ```

## 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` interface with setter and getter methods for the `$username` and `$gender` properties.

* Now, create a `Commentator` class to implement the `User` interface.

* Create a function to add `Mr.` or `Mrs.` to the username. When you’re writing the function, make sure to type hint it correctly so it can only get the types it is expected to.

* In the `test()` method, create a user with the name `Jane` and against another user with the name `Bob`. Use this function to return their names with an appropriate salutation.


# Expected output
  ```
  Mrs. Jane and Mr. Bob
  ```

# 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` interface with setter and getter methods for the `＄username` and `＄gender` properties.

* Now, create a `Commentator` class to implement the `User` interface.

* Create a function to add `Mr.` or `Mrs.` to the username. When you’re writing the function, make sure to type hint it correctly so it can only get the types it is expected to.

* In the `test()` method, create a user with the name `Jane` and against another user with the name `Bob`. Use this function to return their names with an appropriate salutation.


# Expected output
  ```
  Mrs. Jane and Mr. Bob
  ```

# 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 an interface and implement a method using 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

Challenge: Type Hinting

Task

Expected output

Coding exercise