7
If you want to know if the PHP version is the latest make a file and call it test.php or something.
Make it read:
phpinfo();
?>
That should give you the information you need.
The PHP version should be 4.3.10.
If your host runs Apache, which is quite likely I'd also place a file named .htaccess in your XOOPS root containing:
php_flag register_globals off
Which makes it a lot harder for hackers to control all kinds of variables that should not be directly changeable by visitors. Theoretically this can cause some issues with certain scripts but at least the XOOPS core modules should work fine with it.