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

We need **access modifiers** to limit the modifications that code from outside the classes can make to the class’s methods and properties.

Once we define a property or method as private, only methods within the class are allowed to approach it. So, in order to interact with private methods and properties, we need to provide public methods. Inside these methods, we can put logic that can validate and restrict data that comes from outside the class.

# Example: Validating checks using access modifiers

In our example, we can validate that only specific car models can make their way and be assigned to the `$model` property by defining the allowed alternatives for models in the `setModel()` method. 

We need **access modifiers** to limit the modifications that code from outside the classes can make to the class’s methods and properties.

Once we define a property or method as private, only methods within the class are allowed to approach it. So, in order to interact with private methods and properties, we need to provide public methods. Inside these methods, we can put logic that can validate and restrict data that comes from outside the class.

# Example: Validating checks using access modifiers

In our example, we can validate that only specific car models can make their way and be assigned to the `＄model` property by defining the allowed alternatives for models in the `setModel()` method. 

Learn why to using access modifiers in code.

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

Why Do We Need Access Modifiers?