Description:
------------
I stumbled across this when storing MAC configuration in an INI file.
When the MAC address (length=12) had all numbers and started with "00" then the MAC would not be stored as a section correctly.

Reproduce code:
---------------
<?php
$options = parse_ini_file("test.ini", TRUE);
print_r($options);
?>

-- test.ini --
[001099030277]
option1 = yes

[011099030277]
option2 = yes



Expected result:
----------------
Array
(
    [001099030277] => Array
        (
            [option1] => 1
        )

    [011099030277] => Array
        (
            [option2] => 1
        )

)

Actual result:
--------------
Array
(
    [8] => Array
        (
            [option1] => 1
        )

    [011099030277] => Array
        (
            [option2] => 1
        )

)