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How to determine in PHP that the current user has logged in elsewhere and the current user is elsewhere_PHP Tutorial
- WBOYOriginal
- 2016-07-13 10:10:11982browse
How does PHP determine that the current user has logged in elsewhere and the current user is elsewhere
Source: http://bbs.lampbrother.net/read-htm-tid-121909-ds -1.html#tpc
Main ideas:
1. When logging in, record the user’s SessionID
2. When verifying login, match the recorded user’s SessionID with the current SessionID
3. If they are not the same, explain in Log in elsewhere
Please see the demo code for details, there are comments inside. 
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