How to implement automatic login in php

How to implement automatic login in php: 1. Store the automatic login cookie when logging in for the first time as a verification for the user's next automatic login; 2. During the next login initialization, detect whether there is $ in the computer _COOKIE['autoLogin'] data, if available, log in automatically.

The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.

First of all, when the user logs in for the first time, if you check No need to log in for a week, after the login operation is completed, an automatic login cookie will be stored. This cookie can be "$value is The encrypted data is a string composed of the user's "id" plus a "random code". This random code is stored in the user table in the database for verification the next time the user automatically logs in. It can also be more high-end data, and everyone can use it to their heart's content.

setcookie('autoLogin',$value,7*24*3600 time());

Then during initialization the next time you log in , first check whether there is $_COOKIE['autoLogin'] data in the user's computer. If there is, decrypt the data and analyze it to see if it is the real cookie stored in the previous login (to prevent forgery)

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