ID: 47752
Comment by: peter at lvp-media dot com
Reported By: for-bugs at hnw dot jp
Status: Feedback
Bug Type: Filter related
Operating System: *
PHP Version: 5.2.9
Assigned To: pajoye
New Comment:
Hereby a simple bug47752.phpt file. Tested it on a patched- an an
unpatched installation, results as expected. Strictly speaking +0 and -0
are valid integers, even though neither of them is positive or
negative.
Peter Beverloo
--TEST--
Bug #47752 (FILTER_VALIDATE_INT doesn't allow "+0" and "-0")
--FILE--
<?php
$positive = filter_var ('+0', FILTER_VALIDATE_INT);
$negative = filter_var ('-0', FILTER_VALIDATE_INT);
$zero = filter_var ('0', FILTER_VALIDATE_INT);
$octal = filter_var ('-0123', FILTER_VALIDATE_INT);
var_dump ($positive);
var_dump ($negative);
var_dump ($zero);
var_dump ($octal);
?>
--EXPECT--
int(0)
int(0)
int(0)
bool(false)
Previous Comments:
------------------------------------------------------------------------
[2009-03-24 12:44:19] [email protected]
As far as I remember it is on purpose. 0 cannot be negative or
positive.
But if we agree on allowing them again, no problem here.
Can you please provide tests as well (phpt)?
------------------------------------------------------------------------
[2009-03-24 11:50:38] php at lvp-media dot com
False, this only allows +0 and -0 by checking the lenght of the string,
it verifies that the null is the only character in it.
------------------------------------------------------------------------
[2009-03-24 11:49:06] [email protected]
Right, so this patch is not correct as it would allow octal numbers.
------------------------------------------------------------------------
[2009-03-24 11:46:57] php at lvp-media dot com
Probably the easiest fix for this would be to change line 88 of
logical_filters.c to allow the character "0" as well, seeing values like
-0012 and 0012 get returned as false now as well. Con of this is quite
obvious as well however, as numbers prefixed by 0 often get interpreted
as octal numbers.
A better fix would be to add a check for it;
--- logical_filters.bak 2009-03-24 12:43:23.000000000 +0100
+++ logical_filters.c 2009-03-24 12:45:09.000000000 +0100
@@ -84,6 +84,12 @@
break;
}
+ /* allow +0 and -0 */
+ if ((str + 1) == end && *str == '0') {
+ *ret = 0;
+ return 1;
+ }
+
/* must start with 1..9*/
if (str < end && *str >= '1' && *str <= '9') {
ctx_value = ((*(str++)) - '0');
------------------------------------------------------------------------
[2009-03-23 05:40:58] for-bugs at hnw dot jp
Description:
------------
FILTER_VALIDATE_INT doesn't allow "+0" and "-0",
while "0", "+1", and "-1" is valid.
Reproduce code:
---------------
<?php
var_dump(intval("+0"));
var_dump(filter_var("+0", FILTER_VALIDATE_INT));
var_dump(intval("-0"));
var_dump(filter_var("-0", FILTER_VALIDATE_INT));
Expected result:
----------------
int(0)
int(0)
int(0)
int(0)
Actual result:
--------------
int(0)
bool(false)
int(0)
bool(false)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47752&edit=1
