Are you using suPHP? If you are, then unless you have this in /opt/suphp/etc/suphp.conf file:
Code:
[phprc_paths]
;Uncommenting these will force all requests to that handler to use the php.ini
;in the specified directory regardless of suPHP_ConfigPath settings.
application/x-httpd-php=/usr/local/lib/
application/x-httpd-php4=/usr/local/php4/lib/
application/x-httpd-php5=/usr/local/lib/
You are allowing individual php.ini files on each account. The above lines will prevent individual php.ini files. Without restricting a php.ini file under suPHP, each account user can configure their own settings, bypassing your security settings.