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Bug #42866 str_split() returns extra char when given string size is not mulitple of lenth
Submitted: 2007-10-05 11:20 UTC Modified: 2007-11-21 02:27 UTC
From: kraghuba at in dot ibm dot com Assigned:
Status: Closed Package: Strings related
PHP Version: 6CVS-2007-10-05 (snap) OS: linux,win xp
Private report: No CVE-ID: None
View Developer Edit
 [2007-10-05 11:20 UTC] kraghuba at in dot ibm dot com 
Description:
------------
str_split() returns extra charecter when given string is not mulitple of given length. for example if the given string size is 22 and split length is 5, then the last element of the returned array contains 5 or more than 5 chars, which is wrong. The last element of the return array should only contain 2 chars.

This behavior is only noticed on  PHP6 with UNICODE ON

Reproduce code:
---------------
<?php
$str = 'Testing str_split()';
$split_length = 5;

var_dump( str_split($str, $split_length) );

?>

Expected result:
----------------
array(4) {
  [0]=>
  unicode(5) "Testi"
  [1]=>
  unicode(5) "ng st"
  [2]=>
  unicode(5) "r_spl"
  [3]=>
  unicode(4) "it()"
}

Actual result:
--------------
array(4) {
  [0]=>
  unicode(5) "Testi"
  [1]=>
  unicode(5) "ng st"
  [2]=>
  unicode(5) "r_spl"
  [3]=>
  unicode(8) "it()^@E^@1"
}

Patches

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 [2007-11-15 17:43 UTC] claudiocherubino at gmail dot com 
I tried fixing the bug, in my opinion a single line should be changed.
Sorry, I don't know if this is the right place to post the patch.
Here it is:


Index: ext/standard/string.c
===================================================================
RCS file: /repository/php-src/ext/standard/string.c,v
retrieving revision 1.655
diff -u -r1.655 string.c
--- ext/standard/string.c	7 Oct 2007 05:15:06 -0000	1.655
+++ ext/standard/string.c	15 Nov 2007 17:29:00 -0000
@@ -7802,7 +7802,7 @@
 	}
 
 	if (p != (str.s + str_len * charsize)) {
-		add_next_index_zstrl(return_value, str_type, ZSTR(p), (str.s + str_len * charsize - p), 1);
+		add_next_index_zstrl(return_value, str_type, ZSTR(p), (str.s + str_len * charsize - p)/charsize, 1);
 	}
 }
 /* }}} */
 [2007-11-21 02:27 UTC] stas@php.net 
This bug has been fixed in CVS.

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/.
 
Thank you for the report, and for helping us make PHP better.

thanks
 
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