FPM: php_value and php_admin_value entries are applied in reverse order [.phpt test included]

Description

The following FPM config:

[global]
error_log = {{FILE:LOG}}
[unconfined]
listen = {{ADDR}}
pm = static
pm.max_children = 5
php_value[memory_limit]=32M
php_value[memory_limit]=24M
php_admin_value[date.timezone]=Europe/London
php_admin_value[date.timezone]=Europe/Paris

Resulted in this php-fpm -tt output:

…
[26-Jan-2024 07:24:03] NOTICE: 	php_value[memory_limit] = 24M
[26-Jan-2024 07:24:03] NOTICE: 	php_value[memory_limit] = 32M
[26-Jan-2024 07:24:03] NOTICE: 	php_admin_value[date.timezone] = Europe/Paris
[26-Jan-2024 07:24:03] NOTICE: 	php_admin_value[date.timezone] = Europe/London

But I expected this output instead:

…
[26-Jan-2024 07:24:03] NOTICE: 	php_value[memory_limit] = 32M
[26-Jan-2024 07:24:03] NOTICE: 	php_value[memory_limit] = 24M
[26-Jan-2024 07:24:03] NOTICE: 	php_admin_value[date.timezone] = Europe/London
[26-Jan-2024 07:24:03] NOTICE: 	php_admin_value[date.timezone] = Europe/Paris

[!NOTE]
This is not just cosmetic ordering in php-fpm -tt; the values are also applied in this order as INI directives, so ini_get() will return 32M and Europe/London instead of the expected 24M and Europe/Paris.

PHPT:

<?php // this is just for GitHub syntax coloring ?>
--TEST--
FPM: GH-13249 - php_value and php_admin_value entries are applied in reverse order
--SKIPIF--
<?php include "skipif.inc"; ?>
--FILE--
<?php

require_once "tester.inc";

$cfg = <<<EOT
[global]
error_log = {{FILE:LOG}}
[unconfined]
listen = {{ADDR}}
pm = static
pm.max_children = 5
php_value[memory_limit]=32M
php_value[memory_limit]=24M
php_admin_value[date.timezone]=Europe/London
php_admin_value[date.timezone]=Europe/Paris
EOT;

$code = <<<EOT
<?php
echo "Test Start\n";
var_dump(ini_get('memory_limit'), ini_get('date.timezone'));
echo "Test End\n";
EOT;

$tester = new FPM\Tester($cfg, $code);
$tester->start();
$tester->expectLogStartNotices();
$tester->request()->expectBody([
    'Test Start',
    'string(3) "24M"',
    'string(12) "Europe/Paris"',
    'Test End'
]);
$tester->terminate();
$tester->close();

?>
Done
--EXPECT--
Done
--CLEAN--
<?php
require_once "tester.inc";
FPM\Tester::clean();
?>

Test log:

---- EXPECTED OUTPUT
Done
---- ACTUAL OUTPUT
>>> Response
----------------- OUT -----------------
X-Powered-By: PHP/8.3.2
Content-type: text/html; charset=UTF-8

Test Start
string(3) "32M"
string(13) "Europe/London"
Test End

----------------- ERR -----------------

---------------------------------------

ERROR: ==> The expected body:
Test Start
string(3) "24M"
string(12) "Europe/Paris"
Test End
==> does not match the actual body:
Test Start
string(3) "32M"
string(13) "Europe/London"
Test End

LOGS:
--------------------------------------------------------------------
[26-Jan-2024 08:55:34] NOTICE: fpm is running, pid 62872
[26-Jan-2024 08:55:34] NOTICE: ready to handle connections
--------------------------------------------------------------------

Done
---- FAILED

PHP Version

PHP 8.3.2

Operating System

No response