How to set up only one user online in php

How to set up only one user online in php: 1. Add a field to the user table to store the unique string generated by session_id(); 2. Store the string in the field when the user logs in for the first time; 3. Overwrite this field value with a new string; 4. Just implement the judgment in the parent class construction method.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3.

How to set up only one user online in php?

1. Use the session_id() function

2. Add a field to the user table to store the unique string generated by session_id()

3. User 1 logs in for the first time The string will be stored in the field

4. When user 1 logs in here, there will be a new string to overwrite the field value

5. Judging by the parent class construction method, Check the unique string of the logged-in user ID in the current session, whether == session_id()

6. If not equal, the session will be destroyed, and the user will jump to the login page when operating the page.

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