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Bug #57352 FILTER_VALIDATE_INT returns wrong value
Submitted: 2006-11-07 08:54 UTC Modified: 2015-01-09 00:33 UTC
From: troehr@php.net Assigned: pajoye (profile)
Status: Closed Package: filter (PECL)
PHP Version: 5_2 CVS-2006-11-07 OS: Win XP
Private report: No CVE-ID: None
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 [2006-11-07 08:54 UTC] troehr@php.net 
Description:
------------
Revision: 1.52.2.25 of filter extension with PHP 5.2.0:

Using filter_var() etc. with FILTER_VALIDATE_INT returns wrong value instead of false.

Reproduce code:
---------------
var_dump(filter_var('2147483648', FILTER_VALIDATE_INT));
var_dump(filter_var('-2147483649', FILTER_VALIDATE_INT));

Expected result:
----------------
bool(false)
bool(false)

Actual result:
--------------
int(-2147483648)
int(2147483647)

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 [2006-11-09 12:46 UTC] ilia at prohost dot org 
Both are valid numeric values, where is the problem?
 [2006-11-10 05:37 UTC] troehr@php.net 
Sure, but it does not tell me whether the specified numeric value is a valid INTEGER. I thought that is what FILTER_VALIDATE_INT is supposed to do!?!

Returning -2147483648 when validating 2147483648 does not seem correct to me.

How can I safely check that a value is theoretically a valid integer so that I can safely cast it to int?
 [2006-11-10 07:33 UTC] pierre dot php at gmail dot com 
It is the visual representation of the number or suffering 32bit signed interger limits.

We may clamp it to the max/min integer but it will be equally wrong (but this time both internally than visually). (int)"2147483648" or (int)"-2147483649" both returns: 2147483647 using php directly.

I'm unsure about the best choice, make large numbers invalid may be another solution (and safer). Ilia, what's your preference?
 [2006-11-10 09:04 UTC] troehr@php.net 
What about adding FILTER_VALIDATE_NUM for "unlimited" numbers and make FILTER_VALIDATE_INT return false if the int boundaries are exceeded?
 [2006-11-10 10:17 UTC] pierre dot php at gmail dot com 
Documentation problem, I will add the overflow behaviors to the filter extension, it is documented elsewhere as well but having in the filter doc will minimize the wtf factor.
 [2013-10-26 18:06 UTC] cmbecker69 at gmx dot de 
This bug has been fixed already since PHP 5.2.14 and PHP 5.3.3[1];
values that overflow return false now.

[1] <http://3v4l.org/nuEB8>
 [2015-01-09 00:33 UTC] ajf@php.net
-Status: Assigned +Status: Closed
 
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