Description:
------------
If I have an array of arrays and I iterate over the parent array with a foreach loop "foreach($a as $k => $d)" then the internal pointers of the subarrays will be reset.  I presume this is caused by copying $a[$k] into $d on each iteration.  It is also reproduced by simply doing an array copy "$c = $a".

Ultimately, this is an issue of array copying.

Reproduce code:
---------------
$a = array(
    'a' => array(
        'A', 'B', 'C', 'D',
    ),
    'b' => array(
        'AA', 'BB', 'CC', 'DD',
    ),
);

// Set the pointer of $a to 'b' and the pointer of 'b' to 'CC'
reset($a);
next($a);
next($a['b']);
next($a['b']);
next($a['b']);

var_dump(key($a['b']));
foreach($a as $k => $d)
{
}
// Alternatively $c = $a; and foreachloop removal will cause identical results.
var_dump(key($a['b']));


Expected result:
----------------
int(3)
int(3)

Having made no changes to $a I would expect nothing about $a to change.  As an end-user, if I'm making a *copy* of something then I would not expect the original to change and this would include internal state.  Really: I would prefer the pointer not change in the original and that the copy would retain the pointer as well.

Actual result:
--------------
int(3)
int(0)