php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #7755 bitwise and misbehaving with & 0xffffff00
Submitted: 2000-11-10 22:29 UTC Modified: 2001-05-13 05:33 UTC
From: roland at astrofoto dot org Assigned:
Status: Closed Package: Math related
PHP Version: 4.0.3pl1 OS: Linux, RedHat 7.0
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: roland at astrofoto dot org
New email:
PHP Version: OS:

 

 [2000-11-10 22:29 UTC] roland at astrofoto dot org 
I have the following snippet of code

$w = ip2long("192.168.2.35");
$x = $w & 0xffffff00;
$y = $w & (0xffffff << 8);
$z = ip2long("192.168.2.0");
printf ("w = %s<br>", dechex($w));
printf ("x = %s<br>", dechex($x));
printf ("y = %s<br>", dechex($y));
printf ("z = %s<br>", dechex($z));

which outputs this:

w = c0a80223
x = 80000000
y = c0a80200
z = c0a80200

I can't come up with any reason why $x should be set as it is....

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2000-11-14 12:04 UTC] stas@php.net 
Please try latest CVS version (also available from
snaps.php.net) and report if it works better.
 [2000-11-23 07:41 UTC] stas@php.net 
Still not working, possibly won't for some time - since PHP
numbers are 32-bits signed, so they don't work well as
32-bit unsigned.
 [2000-12-12 05:56 UTC] stas@php.net 
I suspend this bug since PHP has no good solution for it in
the foreseeable future. Please use GMP functions for this.
 [2001-05-13 05:33 UTC] derick@php.net 
This is not a bug, so closing.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Tue Dec 03 17:01:29 2024 UTC