How do I use php code from a different domain?

Here's what I'm trying to do: I have a php page I created on one domain, that stores information in a database. Next, I have another web page (This page is html NOT php) on a Different domain that I call this php page using Javascript, and would like to return a variable from the php page. How is this possible? I know it is, so don't say that it isn't! (10 points for the person that finally answers this question!)

 

I don't know why you are calling from html to php.
Use Ajax in the HTMl page to call PHP page.....