Description:
------------
There is an array with 3 values. These values are referenced by 3 string-keys. 

It seems that there is a implicit cast with the index '0' to int, so that
(0 == "any string") is always true. 

but:
('0' == "any string") is always false, so there is no reason for that result.

Test script:
---------------
$kat['test'] = "a";
$kat['0'] = "b";
$kat['1'] = "c"; 
   
foreach ($kat as $key => $val)
{
   if ($key != "test")
      $i++;
}
echo $i;

Expected result:
----------------
2

Actual result:
--------------
1