Sorry, my desired result should have been:

0: one
1: two
2: three
0: one
1: two
2: three

This was recently discussed on the developers list and decided to keep the current behavior which is iterating over the object's property table

That means there's no way to use an Iterator and advance the array pointer more than once per iteration. You can't use a for loop, and you can't use while + list/each, so you're only option is to use foreach and use the Iterator specific methods such as:

$iter->next();

etc. which precludes you from writing code that can handle arrays OR Iterators effectively (unless you actually check the type of the array/Iterator and handle it differently) such as:

if(!($my_arr instanceof Iterator))
{
    while(current($my_arr))
    {
        list($key,$value) = each($my_arr);
        //do stuff... do we need to advance the pointer again?
        //yes we do ... 
        list($key,$value) = each($my_arr);
        //do stuff... do we need to advance the pointer again?
        //not this time ... 
    }
}

else
{
    while($my_arr->valid())
    {
        ... etc ... 
    }
}

which is highly cumbersome. An Iterator should just behave like an array when it comes to Iteration, what's the point of having it not work with list/each?