You'd better install a control panel on your server.
Paid: Cpanel (
http://cpanel.com)
Paid: Directadmin (
http://directadmin.com)
Free: Webmin (
http://webmin.com)
Free: VHCS2 (
http://vhcs.com
With these control panels you can check your settings.
I'm not giving you a direct solutions, because of the reason that you will need not to check only the PHP version, but there are alot of different check-ups to do.
Much regards,