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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
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From: mahesh dot vemula at in dot ibm dot com
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 [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"

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 [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.
 
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