How to implement verification code login in php

php method to implement verification code login: 1. Create an html page to display the verification code; 2. Create a php file and accept the verification code information passed in from the front-end page; 3. Create a verification code to generate a PHP file.

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

Verification codes are very common in our daily lives. Using verification codes has many benefits, such as:

Prevent malicious cracking of passwords. For example, in order to obtain user information, some hackers use different means to send data to the server to verify the accuracy of guessed user information.

Prevent malicious ticket manipulation and forum flooding. This phenomenon of flooding has existed in forums for a long time, such as Tieba, where posts are constantly sent. Now Baidu Tieba has set a time limit for users to post. If there are too many posts within a certain period of time, you will not be able to continue posting.

Prevent malicious requests. For example, if a user submits a form information, it will cause a waste of server resources and malicious attacks by continuously requesting data information from the background.

Fun. This is a personal opinion. When we submit a form, if we encounter some interesting verification code methods, it can enhance the user's love for the website.

Get user information. This is a common occurrence in today's sites. For example, if we register an account on a site, we need to pass the mobile phone verification code to register successfully. After getting the user's phone number, the website will send some marketing information to the owner of the mobile phone number.

So how do we implement the verification code login function? Let’s take a look together!

Environment configuration:

You only need to install the GD extension library of PHP locally to use it. How to check, create a PHP file and write in the file, access the file, and if you see that the GD library has been installed, you can use it.

Specific code implementation:

1. We first create an html page to display the verification code

2. Create a PHP file to accept the verification code information passed in from the front-end page.

        

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3. Create verification code to generate PHP file

        

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