Online PHP editor | refs for vhFvv

<?php class Mammal { function mate(Mammal $with) { $class = substr($this::class, 0, -1) . substr($with::class, 1); eval("class $class extends Mammal {}"); return new $class; } } class Panda extends Mammal {} class Dolphin extends Mammal {} $mingmong = new Panda; $charles = new Dolphin; $charlimong = $mingmong->mate($charles); var_dump($charlimong);