grapheme_substr() returns false if length parameter is to large

Bug #55562	grapheme_substr() returns false if length parameter is to large
Submitted:	2011-09-01 13:19 UTC	Modified:	2011-09-04 18:50 UTC
From:	thomas at weinert dot info	Assigned:	stas (profile)
Status:	Closed	Package:	I18N and L10N related
PHP Version:	5.3.8	OS:	Windows
Private report:	No	CVE-ID:	None

[2011-09-01 13:19 UTC] thomas at weinert dot info

Description:
------------
If the input string contains multibyte characters and the length argument is greater then the possible maximum length of the result the function returns false.

Test script:
---------------
<?php
var_dump(
  grapheme_substr('FOK', 1, 20), // expected: OK
  grapheme_substr('한국어', 1, 20) //expected: 국어
);

Expected result:
----------------
string(2) "OK"
string(6) "국어"

Actual result:
--------------
string(2) "OK"
bool(false)

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[2011-09-04 17:14 UTC] pajoye@php.net

-Status: Open +Status: Assigned -Assigned To: +Assigned To: stas

[2011-09-04 17:14 UTC] pajoye@php.net

I can confirm this bug, but I'm not sure how to fix it correctly. If I fix the 
related logic, the substr tests then partially fail. This function is cryptic and 
should really deserve some comments about what means each variable name and what 
are their goals...

[2011-09-04 18:50 UTC] stas@php.net

-Status: Assigned +Status: Closed

[2011-09-04 18:50 UTC] stas@php.net

This bug has been fixed in SVN.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.

 For Windows:

http://windows.php.net/snapshots/
 
Thank you for the report, and for helping us make PHP better.

fixed, thanks