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Object-Oriented Programming in PHP

Solution Review: Inheritance

Explore inheritance in PHP object-oriented programming by working with protected properties, creating subclasses, and overriding methods. Understand how to use magic constants like __CLASS__ and implement practical OOP features to manage user roles and interactions.

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Solution

PHP
<?php
class User {
    protected $username;
    public function setUsername($name) {
        $this -> username = $name;
    }
}
class Admin extends User {
    public function expressYourRole() {
        return strtolower(__CLASS__); 
    }
    
    public function sayHello() {
        return "Hello admin, " . $this -> username; 
    }
}
function test(){
    $admin1 = new Admin();
    $admin1 -> setUsername("Balthazar"); 
    return $admin1 -> sayHello();
}
echo test();
?>

Explanation

-** Line 2:** We create a User class with a protected property named $username. The User class also contains a public setter method named setUsername(), which is used to set the value of the $username ...