Description:
------------
This is a repost of 33264

33264 was closed because it was said the bug is the same 
as 31114. They are however completly different.

31114 is about foreach where the $key and $value are the 
same:
foreach ($array AS $key => $key)
which should, perhaps issue a warning.

However, 33264 is about foreach not issuing an error 
when you try and loop on an unset variable or a string 
e.g.:

$array = '';
foreach ($array AS $value) {

this should, and used to issue an error (I think it was 
fatal). It not longer does.

The manual even suggests this error is not preventable 
with a @, but not it dosen't appear at all.

So this is both a real bug and important.

Reproduce code:
---------------
<?php
error_reporting(E_ALL);
foreach ($a AS $b) {
}
?>

Expected result:
----------------
Error about $a not being an array.

Actual result:
--------------
No error.