Store variables in PHP outside of sessions

In PHP, is there a way to store variables that persist between sessions and even different users accessing the page - that does not use a database, and is fast?

I am creating a marketing a/b split test script.

I wish to store a variable called $Pagecount - that is incremented each time anyone lands on my webpage - and the content shown is dependent on what the variable is.

I am not using MySQL or cookies for this.