You can send FMPhost a support message asking them to set up the server script. Just go to my hosting and raise a support ticket with the file name, a username and password, scriptname, and when you want it scheduled.
Thanks Carl - good to know :-)
limit the IP(s) that can access the PHP?
a good suggestion, sky. the presumption is that your database (and hosting company) is set up to share your database with PHP (and/or XML)