CGI scripting is now enabled by default on all sites. The ability to enable/disable CGI scripting for sites has been removed.
You can verify CGI/Perl functionality through How can I test CGI/Perl functionality?
If your PHP script is not working, check the following:
1. Did you save it as a file with the ".php" extension?
2. Did you upload it to the correct folder on the server?
3. Did you upload it in ASCII?
If you check all of these...