Bug #45488 [Com]: preg_replace failed when the $subject parameter length exceeds 100009
Edit report at http://bugs.php.net/bug.php?id=45488&edit=1
ID: 45488
Comment by: daniel dot reiche at tu-dresden dot de
Reported by: webez dot cn at gmail dot com
Summary: preg_replace failed when the $subject parameter length
exceeds 100009
Status: Bogus
Type: Bug
Package: PCRE related
Operating System: *
PHP Version: 5.2.6
New Comment:
if this is intended, shouldn't the manual reflect that and e.g. state
that the subject length is limited by PCRE_BACKTRACK_LIMIT ?
Just happened to stumble over this myself, and only the Bug-Report
Dialog showed this bug to me after i tried to write a new one.
Was not able to find it myself using the search!
Previous Comments:
------------------------------------------------------------------------
[2008-07-12 16:06:33] felipe@php.net
This is expected, it when fails preg_last_error() returns: int(2)
That means PREG_BACKTRACK_LIMIT_ERROR.
See
http://docs.php.net/manual/en/pcre.configuration.php#ini.pcre.backtrack-limit
------------------------------------------------------------------------
[2008-07-11 17:57:39] webez dot cn at gmail dot com
Description:
------------
if the $subject parameter's length exceeds 100009, str_replace has no
return value.
This has been reproduced on windows 2003 with php 5.2.6 and Linux with
php 5.2.5
PS:
If there is backslash in the $subject parameter and $pattern parameter,
the critical poiont will change, the maximum string length to reproduce
this bug will increase.
Reproduce code:
---------------
<?
$dummyText=str_pad("[start]",100016-strlen("[start][end]"),"*")."[end]";
str_replace_test($dummyText);
$dummyText=str_pad("[start]",100017-strlen("[start][end]"),"*")."[end]";
str_replace_test($dummyText);
function str_replace_test($dummyText){
$result=preg_replace("/\[start\](.+?)\[end\]/eis","passed",$dummyText);
$result==""?$result="failed":true;
echo "str_replace with length: ".strlen($dummyText)."
".$result."<br>";
}
?>
Expected result:
----------------
str_replace with length: 100009 passed
str_replace with length: 100010 passed
Actual result:
--------------
str_replace with length: 100009 passed
str_replace with length: 100010 failed
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=45488&edit=1
Thread (3 messages)