#43841 [Opn->Asn]: mb_strrpos offset is byte count for negative values
ID: 43841
Updated by: nicholsr@php.net
Reported By: josmessa at uk dot ibm dot com
-Status: Open
+Status: Assigned
Bug Type: mbstring related
Operating System: Windows XP
PHP Version: 5.2CVS-2008-01-14 (snap)
-Assigned To:
+Assigned To: hirokawa
New Comment:
assigning to maintainer
Previous Comments:
------------------------------------------------------------------------
[2008-01-14 16:38:46] josmessa at uk dot ibm dot com
Description:
------------
The offset argument appears to do a byte count for negative values of
offset.
In the example below, $string_ascii is 21 characters long and
$string_mb is 21 characters (53 bytes) long. In both cases the needle
appears twice, first at position 9 and secondly at position 20.
When the offset is -24, beyond the character length of the string, it
finds $needle at position 9, when $needle would be expected to be found
when offest is -12 (i.e. behave the same as the ASCII example).
It's also worth noting that strrpos returns a notice when the offset is
outside the boundary of the string whereas mb_strrpos does not.
This may be linked to this bug: http://bugs.php.net/43840.
Reproduce code:
---------------
<?php
$offsets = array(-25, -24, -13, -12);
$string_mb =
base64_decode('5pel5pys6Kqe44OG44Kt44K544OI44Gn44GZ44CCMDEyMzTvvJXvvJbvvJfvvJjvvJnjgII=');
$needle = base64_decode('44CC');
foreach ($offsets as $i) {
echo "\n-- Offset is $i --\n";
echo "Multibyte String:\t";
var_dump( mb_strrpos($string_mb, $needle, $i, 'UTF-8') );
echo "ASCII String:\n";
echo "mb_strrpos:\t\t";
var_dump(mb_strrpos('This is na English ta', 'a', $i));
echo "strrpos:\t\t";
var_dump(strrpos('This is na English ta', 'a', $i));
}
?>
Expected result:
----------------
-- Offset is -25 --
Multibyte String:
Notice: mb_strrpos(): Offset is greater than the length of haystack
string in ...\mb_strrpos.php on line 9
bool(false)
ASCII String:
mb_strrpos:
Notice: mb_strrpos(): Offset is greater than the length of haystack
string in ...\mb_strrpos.php on line 14
bool(false)
strrpos:
Notice: strrpos(): Offset is greater than the length of haystack string
in ...\mb_strrpos.php on line 14
bool(false)
-- Offset is -24 --
Multibyte String:
Notice: mb_strrpos(): Offset is greater than the length of haystack
string in ...\mb_strrpos.php on line 9
bool(false)
ASCII String:
mb_strrpos:
Notice: mb_strrpos(): Offset is greater than the length of haystack
string in ...\mb_strrpos.php on line 14
bool(false)
strrpos:
Notice: strrpos(): Offset is greater than the length of haystack string
in ...\mb_strrpos.php on line 14
bool(false)
-- Offset is -13 --
Multibyte String: bool(false)
ASCII String:
mb_strrpos: bool(false)
strrpos: bool(false)
-- Offset is -12 --
Multibyte String: int(9)
ASCII String:
mb_strrpos: int(9)
strrpos: int(9)
Actual result:
--------------
-- Offset is -25 --
Multibyte String: bool(false)
ASCII String:
mb_strrpos: bool(false)
strrpos:
Notice: strrpos(): Offset is greater than the length of haystack string
in ...\mb_strrpos.php on line 14
bool(false)
-- Offset is -24 --
Multibyte String: int(9)
ASCII String:
mb_strrpos: bool(false)
strrpos:
Notice: strrpos(): Offset is greater than the length of haystack string
in ...\mb_strrpos.php on line 14
bool(false)
-- Offset is -13 --
Multibyte String: int(9)
ASCII String:
mb_strrpos: bool(false)
strrpos: bool(false)
-- Offset is -12 --
Multibyte String: int(9)
ASCII String:
mb_strrpos: int(9)
strrpos: int(9)
------------------------------------------------------------------------
--
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