Static constants? Server persistent?

This is a bit hard for me to explain but is there any way to have PHP store a persistent server-side constant. Something that will stay in RAM and is not dependent on client connection. For example I have this code in consts.inc file: define ("HOME_PAGE", "http://myip.com/index.html); But if I want access to the constant I need to include the file in every script that needs it. I am hoping there is some way to say to the PHP engine, "this is a static constant that will never change, keep it RAM, and share it between invocations/children". Is this feasible? Is it is I could then "cache" whole blocks of static HTML and that would speed up my scripts quite a bit ... AND my my life as a programmer easier since I wouldn't have to always have an "include("conts.inc")" statement at the top of each of my scripts ... Jc