title: Best way to list online users with PHP but without MySQL?
body: <p>I want to make a script that will list online users when they enter a page.
  Simple way is record newly entered users into MySQL and list them for example every second.
  But I don't think it's a good idea with tons of users like in a facebook app come in and out of the page.
  There would be a way with Flash and PHP sockets but I really don't want to use Flash either.
  So is there any option left? </p>