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@ 2019-12-14T23:56:53Z

<?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 $this->name." nom noms ".get_class($food);
    }
}

class Cat extends Animal {}

class Dog extends Animal {
    
    // The dog doesn't care if it's animal food, it'll eat ANY food
    public function eat(Food $food) {
        echo $this->name . " nom noms " . get_class($food);
    }
}

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");
$catFood = new AnimalFood();
$kitty->eat($catFood);
echo "\n";

$doggy = DogShelter::adopt("Mavrick");
$bananaPeel = new Food();
$doggy->eat($bananaPeel);
echo "\n";

$kitty->eat($bananaPeel);

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: Ricky nom noms AnimalFood Mavrick nom noms Food Fatal error: Uncaught TypeError: Animal::eat(): Argument #1 ($food) must be of type AnimalFood, Food given, called in /in/7gbFQ on line 64 and defined in /in/7gbFQ:16 Stack trace: #0 /in/7gbFQ(64): Animal->eat(Object(Food)) #1 {main} thrown in /in/7gbFQ on line 16
Process exited with code 255.
Output for 7.4.0 - 7.4.33: Ricky nom noms AnimalFood Mavrick nom noms Food Fatal error: Uncaught TypeError: Argument 1 passed to Animal::eat() must be an instance of AnimalFood, instance of Food given, called in /in/7gbFQ on line 64 and defined in /in/7gbFQ:16 Stack trace: #0 /in/7gbFQ(64): Animal->eat(Object(Food)) #1 {main} thrown in /in/7gbFQ on line 16
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Parse error: syntax error, unexpected 'string' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/7gbFQ on line 9
Process exited with code 255.

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