From: steemann at globalpark dot de
Operating system: Linux rom 2.4.21-297-smp4G
PHP version: 5.2.5
PHP Bug Type: *Regular Expressions
Bug description: preg_match returning empty array on certain string lengths
Description:
------------
When passing somewhat long strings to the first two parameters of
preg_match, the function result reproducibly changes to an empty
array if the one the strings gets too long.
The reproduce code works on PHP 5.1.4 CLI, but not on PHP 5.2.4 and
PHP 5.2.5 CLI.
When changing the string length of 1536 into 1535, the code also
works fine in PHP 5.2.x.
This affects the seconds parameter of preg_match.
If the 1536 in the reproduce code is reduced to 1535, the code will
work again. But if then the number of iterations in the for loop is
changed from 64 to 65 iterations, the code will misbehave again
(returning the empty array).
Seems to be some length overflow somewhere.
Reproduce code:
---------------
$parts=array();
for ($i=1;$i<=64;$i++)
{
$parts[]="#".$i."#";
}
preg_match("/^(.*)(".implode("|",$parts).")/",$parts[0].str_repeat("
",1536),$matches);
var_dump($matches);
Expected result:
----------------
array(3) {
[0]=>
string(3) "#1#"
[1]=>
string(0) ""
[2]=>
string(3) "#1#"
}
Actual result:
--------------
array(0) {
}
--
Edit bug report at http://bugs.php.net/?id=44764&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=44764&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=44764&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=44764&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=44764&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=44764&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=44764&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=44764&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=44764&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=44764&r=support
Expected behavior: http://bugs.php.net/fix.php?id=44764&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=44764&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=44764&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=44764&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=44764&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=44764&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=44764&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=44764&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=44764&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=44764&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=44764&r=mysqlcfg
