Description:
------------
Running two foreach loops on different parts of the same array, one by reference, one not causes unexpected results.

Reproduce code:
---------------
$foo = array(1,2,3,4,5);

foreach ($foo as $key => &$val) {
   $val++;
}

foreach ($foo as $key => $val) {
   echo $val;
}

Expected result:
----------------
Expected result is:
23456

Actual result:
--------------
Actual Result is:
23455

This is duplicate of bug #47388 which was dismissed without investigation. The problem here is two-fold:

1. The scope of foreach should not extend beyond a foreach loop.
2. $val should be re-initialized as a VALUE, not a REFERENCE.

It looks like the second foreach is doing something comparable to $val = $foo[0]. It should be calling unset($val) prior to assigning anything to it. This is like going into a for loop and finding out that your explicit value for the incrementor variable didn't get set because you had used it in a previous for loop.

I would have commented on #47388, but comments were disabled as it was abruptly closed.

When deciding whether or not to accept this as a bug, please keep in mind that the current implementation serves no programmatic purpose and that the proposed implementation is not only more intuitive/expected, but also serves a purpose.