ID: 38000
Updated by: [EMAIL PROTECTED]
Reported By: dave at smartboy dot com
-Status: Open
+Status: Bogus
Bug Type: PCRE related
Operating System: Windows XP
PHP Version: 5.1.4
New Comment:
Well what I can reproduce is a pcre backtracking and recursion limit.
This is because your regex is particularly difficult to run (you may
note that it will need to backtrack a lot!).
The other problem is that the bundled pcre library was upgraded in PHP
5.1.3. And that version has some 'S'tudy features disabled, and you are
beeing hited by that. PCRE was previously optimizing your complex regex
but now it isn't. We'll have to wait for the next release of PCRE.
In the mean time, you may want to upgrade to php 5.2, where you can
tweak the backtrack and recursion limits on run-time (anyway you can
always tweak them on compile time on any version).
Previous Comments:
------------------------------------------------------------------------
[2006-07-04 21:33:55] dave at smartboy dot com
$str = str_repeat('a', 1000000); //works in PHP 5.1.2
------------------------------------------------------------------------
[2006-07-04 21:23:49] dave at smartboy dot com
It turns out that no test file is needed
$str = str_repeat('a', 1575); //works
$str = str_repeat('a', 1576); //fails
There are really two issues:
- PCRE not working for "long" strings (although 1576 bytes is not
really a "long" string). This greatly limits the usefulness of regexp
pattern matching.
- When PCRE fails the error message is VERY misleading. Surely an
E_NOTICE should be issued by preg_match() if match has failed due to
out of memory, etc.? "Could not open input file" is just plain wrong.
------------------------------------------------------------------------
[2006-07-04 14:40:01] [EMAIL PROTECTED]
please provide the zzz file. (either post a link to it or send it to my
e-mail).
------------------------------------------------------------------------
[2006-07-04 00:46:02] dave at smartboy dot com
Description:
------------
preg_match() with regexp to test for valid UTF-8 sequence - fails and
causes the error message:
'Could not open input file: <name of script>.php'
IF the subject string passed to preg_match() is longer than 1629
characters. (Or in this case the size of the file 'zzz' which contains
ASCII)
There was no such limitation in preg_match() in the previous version of
PHP (5.1.2)
Reproduce code:
---------------
$str = file_get_contents('zzz');
echo "Loaded file...\n";
$result =
preg_match('/^([\x00-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|'
.
'[\xe1-\xec][\x80-\xbf]{2}|\xed[\x80-\x9f][\x80-\xbf]|[\xee-\xef][\x80-\xbf]{2}|'
.
'\xf0[\x90-\xbf][\x80-\xbf]{2}|[\xf1-\xf3][\x80-\xbf]{3}|\xf4[\x80-\x8f][\x80-\xbf]{2})*$/S',
$str) === 1;
echo "Back from preg_match()\n";
var_export($result);
echo "\n";
Expected result:
----------------
Loaded file...
Back from preg_match()
true
Actual result:
--------------
Loaded file...
Could not open input file: u8.php
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=38000&edit=1
