Class Php

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    class Dog {
            public function do_drool( ) {
                    echo "Sluuuuurp\n";
            }
    }
    class Cat { }
    function drool(Dog $some_dog) {
            $some_dog->do_drool( );
    }
    $poppy = new Dog( );
    drool($poppy);
    
    $poppy = new Cat( );
    drool($poppy);
?>