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

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