How can I implement authorization so that only one user can log into the system?

Question

Yii

Hello!
The task is this ... when a user is authorized to the site, an account should not be accessed through another computer ...
how can this be done?

Answer 1

set a cookie for the user (once a minute you update this cookie in the background), remember somewhere on the server that he is authorized (such as a cookie is updated), if he tries to log in, check if there is a record of his authorization and that's all

Answer 2

Yii user Dektrium, for example, has an auth_key that is used for authorization. So, with a new login - rewrite the key to a new one, this is tantamount to anlogin from other devices.