Description:
------------
PHP 5.1.2 cannot handle "{}" in key names, so same code that works on PHP 4.x and 5.0.x, won't work.

Almost same problem described in bug http://bugs.php.net/bug.php?id=33574, but since then it was not added in documentation and it bit different problems, as there it about values, but here problem with keys.

Reproduce code:
---------------
parser.php:
<?php
$ini = parse_ini_file ("./default.lang.php4", true);
echo '<pre>';
print_r($ini);
?>

default.lang.php4:
;<?php exit;?>

[common]
{charset} = "windows-1251"
{title} = "some title"

[check.php]
{fail} = "fail here"

Expected result:
----------------
Array
(
    [common] => Array
        (
            [{charset}] => windows-1251
            [{title}] => some title
        )

    [check.php] => Array
        (
            [{fail}] => fail here
        )

)



Actual result:
--------------
Warning: Error parsing ./default.lang.php4 on line 4 in /home/webadmin/unixro.net/tmp/parser.php on line 2

Array
(
    [common] => Array
        (
        )

)