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

# Protected access modifier

The `protected` modifier allows us to use code from both inside the class and from its child classes.
When we declare a property or a method as `protected`, we can approach it from both the parent and the child classes.

## Example

The first example demonstrates what happens when we declare the `$model` property in the parent class as `private`, then access it from its child class.



# Protected access modifier

The `protected` modifier allows us to use code from both inside the class and from its child classes.
When we declare a property or a method as `protected`, we can approach it from both the parent and the child classes.

## Example

The first example demonstrates what happens when we declare the `＄model` property in the parent class as `private`, then access it from its child class.



Learn about the protected access control modifier and its use in 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

The Protected Access Control Modifier

Protected access modifier