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

<?php 
class User {
  private $firstName;

  public function setFirstName($str){
    $this -> firstName = $str;
  }
  public function getFirstName(){
    return $this -> firstName; 
  }
}

function test()
{
  $user1 = new User();
  $user1 -> setFirstName("Joe");
  return $user1 -> getFirstName();
}

echo test();
?>

# Explanation

* **Line 2:** We write the `User` class with the `$firstName` private property.
* **Line 5:** We add the public setter method `setFirstName()` to the `User` class. This method receives the `$str` variable as a parameter and assigns its value to the `$firstName` property of the class.
* **Line 8:** We add the public getter method `getFirstName()` to the class, which returns the value of  `$firstName` property.
* **Line 13:** We write the `test()` method. We’ll use this to test if the code works successfully.
* **Line 15**–**17:** We 
 create the `$user1` object of the `User` class. Later, we set its `$firstName` to `Joe` and return the `$firstName` from the method using the `getFirstName()` getter method.
* **Line 20:** We echo the `test()` method, which prints `Joe`.

# Explanation

* **Line 2:** We write the `User` class with the `＄firstName` private property.
* **Line 5:** We add the public setter method `setFirstName()` to the `User` class. This method receives the `＄str` variable as a parameter and assigns its value to the `＄firstName` property of the class.
* **Line 8:** We add the public getter method `getFirstName()` to the class, which returns the value of  `＄firstName` property.
* **Line 13:** We write the `test()` method. We’ll use this to test if the code works successfully.
* **Line 15**–**17:** We 
 create the `＄user1` object of the `User` class. Later, we set its `＄firstName` to `Joe` and return the `＄firstName` from the method using the `getFirstName()` getter method.
* **Line 20:** We echo the `test()` method, which prints `Joe`.

Let's look at the solution to the Access Modifiers challenge.

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

Solution Review: Access Modifiers

Solution

Explanation