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Bug #76435 Float with decimals Filter issue with Ca_fr locale
Submitted: 2018-06-09 00:29 UTC Modified: 2018-06-09 12:55 UTC
From: joel dot lamothe dot 42 at gmail dot com Assigned:
Status: Open Package: Filter related
PHP Version: 7.1.18 OS: Windows
Private report: No CVE-ID: None
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 [2018-06-09 00:29 UTC] joel dot lamothe dot 42 at gmail dot com
Description:
------------
---
From manual page: http://www.php.net/filter.filters.sanitize
---

When setting the locale to fr_CA, using filter_var with decimal numbers is behaving irregularly since the comma is the decimal separator in fr_CA, the sanitized float becomes an int losing its comma.

filter_var is either not coded in a locale dependent way or this below scenario is not being caught in its handling of the locale.



Test script:
---------------
<?php
setlocale(LC_ALL, 'fr_CA.utf-8');
$number = 25 / 2;
$temp = filter_var($number, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);

echo $temp;
?>

Expected result:
----------------
12,5

Actual result:
--------------
125

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 [2018-06-09 12:55 UTC] cmb@php.net
Not only is FILTER_SANITIZE_NUMBER_FLOAT not locale aware, but
there also is no possibility to manually override the decimal and
thousand separators[1] (like for FILTER_VALIDATE_FLOAT), which
rather limits its usefulness.

In this case one can get around this limitation by using the flag
FILTER_FLAG_ALLOW_THOUSAND instead of
FILTER_FLAG_ALLOW_FRACTION[2], but that's quite a hack.

[1] <https://github.com/php/php-src/blob/PHP-7.2.7/ext/filter/sanitizing_filters.c#L358-L367>
[2] <https://3v4l.org/IILhX>
 
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