Description:
------------
access a array key results in a undefined string offset notice. 

When swapping lines 
$params  = $params['params'];
$divider = $params['divider'];

to 
$divider = $params['divider'];
$params  = $params['params'];

no notice is reported..

PS: Appears in PHP4 and also PHP5.2.8 (5.2.9 not yet tested)

Reproduce code:
---------------
$params = array (
  'id' => 1,
  'name' => 'Home',
  'clang' => 0,
  'params' => '',
  'divider' => '&',
  'extension_point' => 'URL_REWRITE',
  'subject' => '',
);

$id      = $params['id'];
$name    = $params['name'];
$clang   = $params['clang'];
$params  = $params['params'];
$divider = $params['divider']; // line reports notice


Expected result:
----------------
no notices at all

Actual result:
--------------
Notice: Uninitialized string offset: 0