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<?php abstract class Animal { protected string $name; public function __construct(string $name) { $this->name = $name; } abstract public function speak(); } class Cat extends Animal { public function speak() { echo $this->name . " meows"; } } // However, covariant return types cannot return a more broad type interface AnimalShelter { public function adopt(string $name): Cat; } class CatShelter implements AnimalShelter { public function adopt(string $name): Animal { return new Animal($name); } } $kitty = (new CatShelter)->adopt("Ricky"); $kitty->speak();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of CatShelter::adopt(string $name): Animal must be compatible with AnimalShelter::adopt(string $name): Cat in /in/Lkn8j on line 32
Process exited with code 255.

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