Interface typing

ob1saver.php

<?php

/*
 * Since we don't have method over loading, shouldn't this be possible?
 */

interface Object1Saver
{
    public function save(Object1 $obj);
}

interface Object2Saver
{
    public function save(Object2 $obj);
}

class Saver implements Object1Saver, Object2Saver
{
    public function save($object)
    {
        // do saving stuff
    }
}