Best way to list online users with PHP but without MySQL?

Question

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?

Answer 1

也许您可以使用Memcache来存储用户信息（例如会话）以进行大量的频繁查询。我认为这是一种简单有效的工作方式。

Answer 2

Assuming you are using a login sistem so you have all the info you need stored somewhere in your database!

you can use sessions!

• http://php.net/manual/en/ref.session.php

here there is also a solution on stackoverflow

• Find Number of Open Sessions