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
Let’s add two methods to represent the register and mail functionalities in the `User` class. These methods will echo a string as a placeholder for their actual purpose.

The `User `class is given below. In this task, we’ll do the following:

- Add a `hello()` method that echoes the user’s first name.
- Add a `register()` method to the class that echoes the string `>> registered`.
- Add a `mail()` method to the class that echoes the string `>> email sent`.
- Add `return $this;` to the `hello()` method so it can be chained to any other method in the class.
- Add `return $this;` to the `register()` method so it can also be chained.
- Create a `test()` method with the `$user1` object with its first name as `Jane`. For this object, chain the methods in the following order:

```
hello() -> register() -> mail()
```
# Expected output

  ```
  hello, Jane >> registered >> email sent
  ```

# 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
Let’s add two methods to represent the register and mail functionalities in the `User` class. These methods will echo a string as a placeholder for their actual purpose.

The `User `class is given below. In this task, we’ll do the following:

- Add a `hello()` method that echoes the user’s first name.
- Add a `register()` method to the class that echoes the string `>> registered`.
- Add a `mail()` method to the class that echoes the string `>> email sent`.
- Add `return ＄this;` to the `hello()` method so it can be chained to any other method in the class.
- Add `return ＄this;` to the `register()` method so it can also be chained.
- Create a `test()` method with the `＄user1` object with its first name as `Jane`. For this object, chain the methods in the following order:

```
hello() -> register() -> mail()
```
# Expected output

  ```
  hello, Jane >> registered >> email sent
  ```

# 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!

Implement functions in a class so that they can be chained to any other function.

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: Chaining Methods and Properties

Task