Abstraction in PHP

Example of Abstraction in PHP

<?php

abstract class Animal
{
    public $name;
    public $age;
    
    public function Describe()
    {
        return $this->name . ", " . $this->age . " years old";    
    }
    
    abstract public function Greet();
}

class Dog extends Animal
{
    public function Greet()
    {
        return "Woof!";    
    }
    
    public function Describe()
    {
        return parent::Describe() . ", and I'm a dog!";    
    }
}

$animal = new Dog();
$animal->name = "Seru";
$animal->age = 5;
echo $animal->Describe();
echo $animal->Greet();

?>

Output