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Bug #48330 preg_replace() Pattern Modifiers 'e' Bug
Submitted: 2009-05-19 13:51 UTC Modified: 2009-05-19 14:39 UTC
From: seateng at sohu dot com Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 5.2.9 OS: Redhat AS5
Private report: No CVE-ID: None
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 [2009-05-19 13:51 UTC] seateng at sohu dot com 
Description:
------------
preg_replace() Pattern Modifiers 'e'  Bug

Reproduce code:
---------------
<?php
$html_body = '<a href="#">asdf</a>';
echo preg_replace("/(<\/?)(\w+)([^>]*>)/e",
              "'\\1'.strtoupper('\\2').'\\3'",
              $html_body);
?>

Expected result:
----------------
<A href="#">asdf</A>

Actual result:
--------------
<A href=\"#\">asdf</A>

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 [2009-05-19 14:39 UTC] jani@php.net 
RTFM: 

When using the e modifier, this function escapes some characters (namely ', ", \ and NULL) in the strings that replace the backreferences. This is done to ensure that no syntax errors arise from backreference usage with either single or double quotes (e.g. 'strlen(\'$1\')+strlen("$2")'). Make sure you are aware of PHP's string syntax to know exactly how the interpreted string will look like.
 
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