Online PHP editor | output for GvK1N

<?php class Food { public function consume() { } } class AnimalFood extends Food { } abstract class Animal { protected string $name; public function __construct(string $name) { $this->name = $name; } abstract public function speak(); public function eat(AnimalFood $food) { $food->consume(); } } class Dog extends Animal { public function speak() { echo "woof"; } /* * The dog doesn't care if it's animal food, it'll eat ANY food */ public function eat(Food $food) { $food->consume(); } } class Cat extends Animal { public function speak() { echo "meow"; } } interface AnimalShelter { public static function adopt(string $name): Animal; } class CatShelter implements AnimalShelter { public static function adopt(string $name): Cat { return new Cat($name); } } class DogShelter implements AnimalShelter { public static function adopt(string $name): Dog { return new Dog($name); } } $kitty = CatShelter::adopt("Ricky"); $kitty->speak();