From: janne dot salo at exove dot fi
Operating system: CentOS 5.2
PHP version: 5.2.8
PHP Bug Type: Strings related
Bug description: Unexpected substr return value when start is negative
Description:
------------
When substr is given a negative value as $start AND the absolute value of
$start is greater than the length of the string, something unexpected
occurs: $start seems to be considered equal to 0 in this case.
The documentation states: "If string is less than or equal to start
characters long, FALSE will be returned". Strict intepretation would be
that if $start is negative, FALSE will never be returned since a negative
start can never be greater than the length of the string. However, what you
would expect (and what you get in versions older than 5.2.8) is that if the
ABSOLUTE value of start is greater than the length of the string, FALSE
will be returned.
Reproduce code:
---------------
substr("1234567", -9, 2);
Expected result:
----------------
The above call returns FALSE in previous PHP versions (tested with 5.2.2
in MacOS X and 5.2.6 in Fedora 8).
Actual result:
--------------
'12'. (Which corresponds to call substr("1234567", 0, 2))
--
Edit bug report at http://bugs.php.net/?id=47298&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47298&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47298&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47298&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47298&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47298&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47298&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47298&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47298&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47298&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47298&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47298&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47298&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47298&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47298&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47298&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47298&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47298&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47298&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47298&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47298&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47298&r=mysqlcfg
