The substr_count function in PHP 5.2.1 and earlier allows context-dependent attackers to obtain sensitive information via unspecified vectors, a different affected function than CVE-2007-1375.
http://www.securityfocus.com/bid/24012
http://www.novell.com/linux/security/advisories/2007_15_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:187
http://www.attrition.org/pipermail/vim/2007-May/001621.html