Description:
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Copied from: http://nl2.php.net/preg_replace
PHP version: Unknown

preg_replace (and str_replace too) will crash php if you use ' ' (space) as replace value for a large number of matches.

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.


Test script:
---------------
Copied from: http://nl2.php.net/preg_replace
PHP version: Unknown


For example:

$string = preg_replace('/( )+/', ' ', $string);
$string = str_replace(' ', ' ', $string);

will crash if $string contains many seperate matches of ' ' producing 


$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.