<?php abstract class Animal { protected string $name; public function __construct(string $name) { $this->name = $name; } abstract public function speak(); } class Dog extends Animal { public function speak() { echo $this->name . " barks"; } } class Cat extends Animal { public function speak() { echo $this->name . " meows"; } } interface AnimalShelter { public function adopt(string $name): Animal; } class CatShelter implements AnimalShelter { public function adopt(string $name): Cat // instead of returning class type Animal, it can return class type Cat { return new Cat($name); } } class DogShelter implements AnimalShelter { public function adopt(string $name): Dog // instead of returning class type Animal, it can return class type Dog { return new Dog($name); } } $kitty = (new CatShelter)->adopt("Ricky"); $kitty->speak(); echo "\n"; $doggy = (new DogShelter)->adopt("Mavrick"); $doggy->speak();
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