3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Food {} class AnimalFood extends Food {} abstract class Animal { protected string $name; public function __construct(string $name) { $this->name = $name; } public function eat(AnimalFood $food) { echo $this->name . " eats " . get_class($food); } } class Dog extends Animal { public function eat(Food $food) { echo $this->name . " eats " . get_class($food); } } class Cat extends Animal { public function eat(Food $food) { echo $this->name . " eats " . get_class($food); } } 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"); $catFood = new AnimalFood(); $kitty->eat($catFood); echo "\n"; $doggy = (new DogShelter)->adopt("Mavrick"); $banana = new Food(); $doggy->eat($banana);
based on sa7LG
Output for 7.4.0 - 7.4.10, 8.0.0alpha1 - beta3
Ricky eats AnimalFood Mavrick eats Food
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.21
Parse error: syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/14rTK on line 9
Process exited with code 255.