How to run a php file from actionscript

Hey,

This is going to (hopefully) sound silly and be a very easy problem to solve. Basically I have a php file that generates a .xml file. I want to be able to run this .php file from flash on a button press, or at the moment I just want to be able to run it.

So yeah, I just want to be able to run the php file from actionscript so it will create the .xml file that I need so I can then post the images from the .xml file.

Thanks in advance!