Programmer's Reference Guide
Table of Contents
CAPTCHA stands for "Completely Automated Turing test to tell Computers and Humans Apart"; it is used as a challenge-response to ensure that the individual submitting information is a human and not an automated process. Typically, a captcha is used with form submissions where authenticated users are not necessary, but you desire to prevent spam submissions.
Captchas can take a variety of forms, including asking logic questions,
presenting skewed fonts, and presenting images and asking how they
relate. Zend_Captcha aims to provide a variety of back ends that may be
utilized either standalone or in conjunction with
Zend_Form.
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