How to prevent users from logging in at the same time in php

php method to prohibit users from logging in at the same time: 1. Write the latest login IP to one of the last_login_ip fields in the user table; 2. When the login is successful, transfer to the index controller or index method; 3. Determine whether the current IP is equal to the IP "last_login_ip".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

PHP prohibits a single user from logging in to multiple devices at the same time, limiting a single Users log in repeatedly from multiple terminals.

The logic is simple mainly due to three points;

1: When logging in, write the latest login IP to one of the last_login_ip fields in the user table

2: When the login is successful Go to the index controller or index method and first query 2 points inside, 1): Current IP 2): IP

#3 in the last_login_ip stored by the current user in the database field: Then make a judgment to judge the current IP Is it equal to the last_login_ip IP? If not, it means that this account has logged in elsewhere. The logic is very simple, I hope it can help everyone, and the code screenshot is attached below. Hope this helps everyone, thank you.

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