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how do you check if a user already has logged in?
so that if a user in another browser cant log in with the same account.
also, is this a good solution or should i let the user log in in the other browser and then log out the current user and display a message (you are logged in from another location) just like messenger does?
The first half of the question was answered well with how to detect the multiple users but how to treat them I think still needs a bit of work.
First if a user logs in correctly let them in, don’t prevent them if they are logged on some other place. If you really don’t want the user to have two open sessions then log out the old one or simply update the session id that you are saving so you can bounce out the old connection. You can inform if you want but I would only message the session that you invalidated. If you message the user logging in it becomes annoying when you are only dealing with the case of a user switching computers and they forgot to log out of the old session.