What's the best way to cache things on the server? I've found some SetEnv things but this all seems to be a single key/value.
I'd like to cache an array of things that I can access later. Right now it's cached in $_SESSION which is fine, but still there's overhead on every first-time visitor to a site. Is there a way to add something to $_SERVER or elsewhere that ALL visitors to a website will ultimately be able to access?
I guess I want something like web.config in C#, where the first time a page is visited, the "app starts", as it were, and those things are now in cache on the server.
What's the best way to do this?