Use PHP Developer City to add member login verification code function

How to use PHP Developer Mall to implement the member login verification code function

In the Internet era, malls have become one of the main ways for people to shop. For mall websites, in order to ensure the security of user accounts and prevent malicious attacks, it is very important to add a verification code function when members log in. This article will introduce how to use the PHP language developer city to implement the member login verification code function.

1. The role of verification code

Verification code means that when the user logs in, in order to confirm that the user input is generated by a human instead of a machine, it is displayed through images or audio, etc., and requires The user enters it into the corresponding input box in order to verify the user's identity. The role of the verification code mainly has two aspects:

1. Prevent robots from logging in: The verification code can effectively prevent large-scale brute force logins by robot automation programs through scripts, ensuring that only human users can successfully log in.
2. Improve system security: Verification codes can effectively prevent hackers from obtaining user accounts and passwords through brute force cracking and other methods, improving system security.

2. PHP Developer City

The developer city needs to use PHP language as the backend development language, and the database uses MySQL. The process of developing a mall mainly includes the following steps:

1. Determine functions and requirements: The mall needs to implement functions such as product display, shopping cart, order management, and member management. First determine the functions that need to be implemented. and needs.
2. Database design: Design the database table structure according to functions and requirements, including product table, user table, order table, etc.
3. Front-end page design: Design the front-end page of the mall, including product display page, shopping cart page, login page, etc.
4. Backend logic development: Develop backend logic according to needs to implement functions such as adding, deleting, modifying, and checking products, adding and deleting shopping carts, and generating and managing orders.
5. User login function development: Add verification code function to member login function.

3. Implementing the member login verification code function

Implementing the member login verification code function can be divided into the following steps:

1. Generate verification code: Use PHP's GD library to generate verification code images, which can be achieved by calling the functions of the GD library. When generating a verification code, you can set the length of the verification code, the width and height of the verification code image, the font and color of the verification code image, etc.
2. Save the verification code to SESSION: Save the generated verification code to SESSION for subsequent verification of user input.
3. Display verification code image: Display the generated verification code image on the login page, and display the verification code image through the HTML tag.
4. User input verification code: The user enters the verification code on the login page, usually in the input box.
5. Verify user input: Determine whether the verification code entered by the user is correct by comparing whether the verification code entered by the user is consistent with the verification code saved in the SESSION.
6. Verification result of verification code: Based on the verification result of verification code, determine whether the user can log in successfully. If the verification code verification is successful, subsequent login operations will be performed; if the verification code verification fails, the user will be prompted to enter an incorrect verification code and need to re-enter it.

4. Summary

Using PHP Developer City to implement the member login verification code function is an important task. The main purpose is to improve the security of user accounts and prevent malicious attacks. Through the above steps, we can successfully implement the member login verification code function and provide guarantee for the safe operation of the mall. At the same time, the developer mall also needs to pay attention to other security issues, such as XSS attacks, SQL injection, etc., to ensure the security of the mall.

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