interface.php

<?php

interface Data{

}
interface Key extends Data{

}
interface Value extends Data{

}

abstract class Teste{
    public function meToo(Data $data)
    {

    }
}

class MeToo extends Teste{

    public function meToo(Key $data)
    {

    }
}

class KeyClass implements Key {

}

$mt = new MeToo();
$mt->meToo(new KeyClass());