In the vast realm of the internet, combating spam mail is an ongoing challenge for web developers and internet users alike. One effective method to mitigate the influence of spam bots is the implementation of CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart). PHP, a popular server-side scripting language, makes use of the GD (Graphics Draw) library to create CAPTCHA images. This article delves into the world of CAPTCHA and demonstrates how to utilize PHP and the GD library to deploy CAPTCHA on your website.
