如何获取yii2中的在线用户列表

How do I get the list online users in Yii2 application? I use membership, and want to get list of online users to show to admin in control panel.

Is there any way to get the list of ALL logged-in users ?

Thanks! Best regards

It's not easy because of the nature of PHP (stateless). You need to store the list of such users and keep it up to date.

I use the following approach:

1. Save timestamp in users database every time user makes action.
2. List of users that made an action in last 5 minutes is the list of online users.

Of course this is just an approximation:

• User can read single page for more than 5 minutes and so not counts as online although he is.
• User can log out in less than 5 minutes and still counts as online.
• Changing the 5 minutes timer does not fix the problems.

If you want more precise results more sophisticated methods are needed.