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 a class named `Db` that can connect with the database using the private property `$dbh`. The class should be able to create the connection with the database, have a method that can get the connection for the use of other classes, and a method to close the connection.

* Write a `User` class that can get the database connection and save it in the private property named `$dbCon`.

* Write the following methods in the `User` class that can work with the database:

  * `insert()`: This method inserts a new user to the `users` table and returns the `id` of the last insert.


  * `getUserById()`: This method is used to return only a single user by ID.

  * `getAll()`: This method returns all the users.
   
  * `updateUser()`: This method is used to update users by `id`.

  * `delete()`: This method is used to delete a single user by `id`.

* Test your code.

# 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

* Write a class named `Db` that can connect with the database using the private property `＄dbh`. The class should be able to create the connection with the database, have a method that can get the connection for the use of other classes, and a method to close the connection.

* Write a `User` class that can get the database connection and save it in the private property named `＄dbCon`.

* Write the following methods in the `User` class that can work with the database:

  * `insert()`: This method inserts a new user to the `users` table and returns the `id` of the last insert.


  * `getUserById()`: This method is used to return only a single user by ID.

  * `getAll()`: This method returns all the users.
   
  * `updateUser()`: This method is used to update users by `id`.

  * `delete()`: This method is used to delete a single user by `id`.

* Test your code.

# 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 a database class that connects with the database and a user class that inserts objects in the database.

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: PHP Database

Task