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

go to bug id or search bugs for

Bug #39954 ~ operator doesn't convert string to integer first
Submitted: 2006-12-26 15:39 UTC Modified: 2006-12-26 16:38 UTC
From: olafvdspek at gmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.2.0 OS: Windows XP
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: olafvdspek at gmail dot com
New email:
PHP Version: OS:

 

 [2006-12-26 15:39 UTC] olafvdspek at gmail dot com 
Description:
------------
The ~ operator doesn't appear to convert a string to an integer first, like most other operators do. This produces unexpected results of course.

Reproduce code:
---------------
$b = '0';
$b = ~$b;
printf('%s - %s<br>', $b, ord($b));
$b = 0;
$b = ~$b;
printf('%s - %s<br>', $b, ord($b));


Expected result:
----------------
-1 - 45
-1 - 45

Actual result:
--------------
? - 207
-1 - 45

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2006-12-26 15:58 UTC] tony2001@php.net 
Yes, it does not convert strings to numbers and this is by design. It actualy runs the "bitwise not" operator on each character of the string.
 [2006-12-26 16:02 UTC] olafvdspek at gmail dot com 
What's the rationale behind that design?
And when is it useful?
 [2006-12-26 16:38 UTC] iliaa@php.net 
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

It is done for instances when a bitmask is applied to a string 
(one character at a time).
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Sun Jul 13 08:01:32 2025 UTC