note 22813 added to function.preg-replace

I'm having a problem using preg_replace when replacing with $0,$1 etc. Instead of replacing with what was matched in the regexp, preg_replace is replacing with string matches left over from previous occurences of preg_match. Any idea why it's not overwriting these values with the new matches? -- http://www.php.net/manual/en/function.preg-replace.php http://master.php.net/manage/user-notes.php?action=edit+22813 http://master.php.net/manage/user-notes.php?action=delete+22813 http://master.php.net/manage/user-notes.php?action=reject+22813