note 97813 deleted from function.preg-replace by danbrown
| From: | danbrown@php.net | Date: | Mon, 10 May 2010 12:12:52 +0000 |
| Subject: | note 97813 deleted from function.preg-replace by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-169118@lists.php.net to get a copy of this message | ||
Note Submitter: Anonymous
----
preg_replace (and str_replace too) will crash php if you use ' ' (space) as replace value
for a large number of matches.
For example:
$string = preg_replace('/( )+/', ' ', $string);
$string = str_replace(' ', ' ', $string);
will crash if $string contains many seperate matches of ' ' producing following
Apache Error-Log message:
[Mon May 10 09:23:58 2010] [notice] child pid 39251 exit signal Illegal instruction (4)
where pid 39251 was the PHP-thread processing that request.
$string = preg_replace('/( )+/', '', $string);
$string = str_replace(' ', '', $string);
or
$string = preg_replace('/( )+/', '_', $string);
$string = str_replace(' ', '_', $string);
do all work fine.
This seems to be a bug in the underlying PCRE implementation, and not in PHP itself.