captchaapi package for thinkphp. Contribute to abc-php-admin/think-captcha development by creating an account on GitHub.

A simple captcha generator written in PHP using GD extension. This code will create a PNG captcha image within the pre-determined character limit, and register the captcha to the session to be ...

QuickCaptcha provides CAPTCHA functionality to any website running on a PHP-enabled web host. The graphic image below is easily read by humans, but not so easily by computers. This makes it difficult ...

Prior to captchas, web-based service providers would have to employ whole teams of paid workers to keep up with the spam. Now, there's just the captcha -- and much in the way that robots have ...