A class for php to generate image verification code

12Jul2016

Implementation code for PHP to generate a 4-digit verification code. PHP generates a 4-digit verification code. Implementation code for PHP to generate a 4-digit verification code. PHP generates a 4-digit verification code. It is very convenient to implement the verification code in PHP. The key point is to master the usage of PHP gd library and session. Throughout the Internet p

25Jul2016

A piece of code for php to generate dynamic image verification code

13Sep2023

How to create a verification code image using PHP? CAPTCHA is a commonly used method to verify whether the user is a human and not a machine. On websites, we often see verification code images, which require users to enter random characters or numbers displayed on the image to complete operations such as login, registration, and commenting. This article will introduce how to use PHP to create a verification code image and provide specific code examples. 1. PHPGD library To create a verification code image, we need to use PHP's GD library. The GD library is an extension for processing images.

13Jul2016

An example of how to generate image verification code in PHP. An example of how PHP generates image verification codes. This article demonstrates 5 types of verification codes with examples and introduces the function for generating verification codes. The principle of PHP generating verification code: Generate a verification code through the GD library

16Jun2017

This article mainly introduces the generation code of PHP image verification code in detail. It has certain reference value. Interested friends can refer to it.

17Mar2021

This article mainly uses the GD library to put random strings on images to generate verification codes, thereby interfering with computer recognition.