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Bug #42136 filter_var() fails for "0"
Submitted: 2007-07-29 09:38 UTC Modified: 2007-07-29 10:56 UTC
From: gnupun at yahoo dot com Assigned:
Status: Not a bug Package: Filter related
PHP Version: 5.2.3 OS: Windows XP
Private report: No CVE-ID: None
 [2007-07-29 09:38 UTC] gnupun at yahoo dot com
filter_var() design is broken... the following code always returns FALSE:

filter_var() obviously needs two outputs: the filtered value and a success/failure code.

($value, $errcode) = filter_var(...

Reproduce code:
$myint = "0";
if (!filter_var($myint, FILTER_VALIDATE_INT)) {
    echo "$myint is not an integer\n";
else {
    echo "$myint is an integer\n";

Expected result:
0 is an integer

Actual result:
0 is not an integer


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 [2007-07-29 10:56 UTC]
if (!0) will succeed. That's how PHP works. 

You should use:

$filtered = filter_var($myint, FILTER_VALIDATE_INT)

if ($filtered === FALSE)...

There is also an option to return NULL on error.

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