如何知道在php中使用我的应用程序的并发用户数量？

Question

I have a php web page, but I would like to show how many user is currently online.... How can I do so? Thank you.

Answer 1

You'll have to save last visit of unique IP visitor. (If you would like to take it by IP)

After that, select everyone that last visited your site in past 100 seconds (example).

$query = "SELECT count(1) FROM unique_users WHERE last_click > ".(time() - 100);