March 7, 2008 - 9:45am
Hi
I'm still using PHP 4.3.9 on RedHat/CentOS 4 servers, which were installed ~ 2 years old.
RedHat backports security patches for PHP 4, and the end of "maintenance phase" for RedHat 4 is Feb 29, 2012
There are more details here : http://www.redhat.com/security/updates/errata/