PHP: how to determine if the current user has logged on elsewhere

PHP determines how the current user has logged on elsewhere and the current user has logged on elsewhere. PHP how to determine the current user has logged on elsewhere, the current user elsewhere Source: bbs.lampbrother.netread-htm-tid-121909-ds-1.html # tpc main idea: 1. login, the user's PHP how to determine the current user has logged on elsewhere, the current user elsewhere

Source: http://bbs.lampbrother.net/read-htm-tid-121909-ds-1.html#tpc

Main ideas:
1. log on and record the user's SessionID.
2. verify that the user SessionID recorded matches the current SessionID during logon.
3. if they are different, log on elsewhere.
For details, see the demo code, which contains comments.

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