Description:
------------
In PHP 5.2.4 when I set array values inside a foreach, the array pointer is moved to the second element of the array or, better, to the element after the first modified element of the array.

In PHP 5.2.3 the array pointer was not moved.

Moreover this does not happen if i assign the array elements outside the foreach.

Reproduce code:
---------------
$parameters = array(
        'a' => 1,
        'b' => 2,
        'c' => 3,
        'd' => 4
);
echo "\$parameters key before foreach: " . key($parameters) . "\n";
foreach($parameters as $key => $value) {
        $parameters[$key] = "s" . $value;
}
echo "\$parameters key after foreach: " . key($parameters) . "\n";

echo "\$parameters key before foreach: " . key($parameters) . "\n";
$parameters['a'] = "s" . 1;
$parameters['b'] = "s" . 2;
$parameters['c'] = "s" . 3;
$parameters['d'] = "s" . 4;
echo "\$parameters key after foreach: " . key($parameters) . "\n";


Expected result:
----------------
$parameters key before foreach: a
$parameters key before foreach: a

$parameters key before foreach: a
$parameters key before foreach: a

Actual result:
--------------
$parameters key before foreach: a
$parameters key before foreach: b

$parameters key before foreach: a
$parameters key before foreach: a