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

go to bug id or search bugs for

Bug #42528 Out of "char"(8-bit) range value doesn't roll back, with uni-code ON.
Submitted: 2007-09-03 11:53 UTC Modified: 2009-08-25 15:56 UTC
From: mahesh dot vemula at in dot ibm dot com Assigned:
Status: Not a bug Package: *Unicode Issues
PHP Version: 6CVS-2007-09-03 (CVS) OS: RHEL4
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: mahesh dot vemula at in dot ibm dot com
New email:
PHP Version: OS:

 

 [2007-09-03 11:53 UTC] mahesh dot vemula at in dot ibm dot com 
Description:
------------
The character(8-bit) range of value does not roll back to the corresponding minimum value, once the value reaches beyond the range of a char(8-bit) that it can hold, when Unicode is ON.


Reproduce code:
---------------
--TEST--
--FILE--
<?php
var_dump( decbin( ord(chr(255)) ) );
var_dump( decbin( ord(chr(256)) ) );
var_dump( decbin( ord(chr(257)) ) );
?>
--EXPECTF--


Expected result:
----------------
unicode(8) "11111111"
unicode(1) "0"
unicode(1) "1"

Actual result:
--------------
unicode(8) "11111111"
unicode(9) "100000000"
unicode(9) "100000001"

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2007-09-07 12:30 UTC] mahesh dot vemula at in dot ibm dot com 
Samething is happening for strncasecmp() function also.
 [2009-08-25 15:56 UTC] sjoerd@php.net 
Thank you for your bug report.

In unicode, characters and bytes do not map one-on-one. That means that the codepoint for a character may be bigger than 256. The ord() function returns the numerical value for the codepoint, which may be bigger than 256. It should not wrap around as you describe.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Mon Dec 30 17:01:29 2024 UTC