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PHP-Securimage图片验证码工具

What is Securimage?

Securimage is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to provide protection from spam bots. It can run on most any webserver as long as you have PHP installed, and GD support within PHP. Securimage does everything from generate complicated CAPTCHA images to making sure the code the user entered was correct.

* Check out the quickstart guide to get going fast
* See live example sites using Securimage
* Download the latest version
Securimage是一个开源的PHP验证码脚本，它可以生成复杂的验证码图像，用来保护论坛免于垃圾留言的干扰。
我们可以轻松的把它加入到已存在的论坛中。它可以在大部分安装了PHP的web服务器上运行，只要你安装了GD库。
Securimage生成复杂的验证码，并且会确认用户输入的正确性。
Securimage的Ajax版本所用的是prototype库，呵呵，个人更喜欢jQuery。