Offsite Includes

[twilson]

I am looking to write a program that I can host on my server, and include somehow onto other websites that I design. This way if I update the program ALL of my other sites will be upgraded instantly. I want to simply drop in a config file with the site's specific information and an include to the PHP on my server.

Is this possible?

If so, can I place security on the PHP file on my server saying only certain IPs/domains are allowed to read it so that not everyone can include it. Otherwise can I make some global hash in the config file to compare with a hash in the file on my server?

Thanks in advance,
Tom

[DigitalExpl0it]

id use XML, have them get a xml file from a main site so u just update the xml file and there all updated

[twilson]

It's not data they are going to be updating from the main site though, it's a PHP program...