Buffer overflow in the strval function in PHP before 5.3.6, when the precision configuration option has a large value, might allow context-dependent attackers to cause a denial of service (application crash) via a small numerical value in the argument.
http://bugs.php.net/bug.php?id=54055
http://marc.info/?l=bugtraq&m=133469208622507&w=2
http://www.mandriva.com/security/advisories?name=MDVSA-2011:052
http://www.mandriva.com/security/advisories?name=MDVSA-2011:053
http://www.php.net/archive/2011.php
http://www.php.net/ChangeLog-5.php