#18816 [Opn->Bgs]: results of ip2long and crc32 differ on different os/architectures
| From: | iliaa@php.net | Date: | Thu, 08 Aug 2002 20:23:56 +0000 |
| Subject: | #18816 [Opn->Bgs]: results of ip2long and crc32 differ on different os/architectures | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-16322@lists.php.net to get a copy of this message | ||
ID: 18816
Updated by: iliaa@php.net
-Reported By: nohn@php.net
+Reported By: ilia@prohost.org
-Status: Open
+Status: Bogus
Bug Type: Unknown/Other Function
Operating System: Linux, Tru64
PHP Version: 4CVS-2002-08-08
New Comment:
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php
This is because you are using 2 different architectures, on X86 (AMD
k6) ints are 32 bit, but on Compaq Tru64 (ALpha EV68) they are 64 bit.
Since PHP uses signed ints you got a negative number on X86 where
signed ints are limited to 2147483647 and your result is >3 billion.
If you explicitly tell PHP to output an unsigned number it will work
correctly.
printf("%u", ip2long('192.168.0.1'));
-----
3232235521
Same logic applies to your crc, example.
Previous Comments:
------------------------------------------------------------------------
[2002-08-08 16:09:58] nohn@php.net
Ahh... Please note that I may not be reachable in the next days for
questions, but you may use http://www.testdrive.compaq.com/ to verify
this
------------------------------------------------------------------------
[2002-08-08 16:08:45] nohn@php.net
Following Script produces this output:
$ip = "192.168.0.1";
echo("$ip\n");
echo(ip2long($ip));
----
On Debian/i386 (AMD K6):
192.168.0.1
-1062731775
----
On Compaq Tru64 (ALpha EV68):
192.168.0.1
3232235521
===========================================================================================================
Following Script produces this output:
$text = "Der schnelle braune Fuchs springt über den blöden Hund.";
echo "$text\n";
echo(crc32($text));
----
On Debian/i386 (AMD K6):
Der schnelle braune Fuchs springt über den blöden Hund.
-2050320634
----
On Compaq Tru64 (Alpha EV68):
Der schnelle braune Fuchs springt über den blöden Hund.
1367081892
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=18816&edit=1