Introduction to PHP development user login module

The website user login function is a very commonly used functional module.

For example: Friends often enter the shopping website through the login function interface of the shopping website, and then perform various operations.

The above is a simple user login diagram. Let’s take a look at the main functions of user login:

1. Login form interface javascript script Preliminarily detect the login information entered by the user.

2. The login module checks the user input information with the database data.

3. If the login information is correct, it will prompt successful login and set the user to login status (session).

4. If the login information is incorrect, it will prompt that the login failed and the user can try to log in again.

5. The verification code needs to be consistent with the information in the verification code box on the right. If the entered information is incorrect, a login failure will be prompted.

6. If the verification code is entered correctly, it will prompt successful login.