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<?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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Ricky nom noms AnimalFood Mavrick nom noms Food Fatal error: Uncaught TypeError: Animal::eat(): Argument #1 ($food) must be of type AnimalFood, Food given, called in /in/7gbFQ on line 64 and defined in /in/7gbFQ:16 Stack trace: #0 /in/7gbFQ(64): Animal->eat(Object(Food)) #1 {main} thrown in /in/7gbFQ on line 16
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Ricky nom noms AnimalFood Mavrick nom noms Food Fatal error: Uncaught TypeError: Animal::eat(): Argument #1 ($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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