phpClass 验证码 - Captchazo

johnnywalkerzhu

原始出处：

http://www.phpclasses.org/package/7615-PHP-Validate-users-with-image-or-text-based-CAPTCHA.html

演示地址：

http://www.funsail.cn/phpClass/validation/

验证码
该类能够以基于CAPTCHA（Completely Automated Public Turing Test to Tell Computers and Humans Apart——全自动区分计算机和人类的图灵测试——的简称方式）的文本或图片对用户进行验证；它可以生成图片形式的文本内容让用户输入，或者生成问题由用户在输入框内以数字作答；该类直接生成HTML代码来展现验证的图片或问题；并且返回正确答案来对用户输入进行对比；

原文
This class can validate users with image or text based CAPTCHA.It can generate either an image with challenge text that the user must enter or a question presented in the form of text that the user must answer entering a number.The class generates the HTML to present either the validation image or question.It also returns the right answer so it can be compared with what the user entered.