Captcha component from Zend Framework
PHP
Latest commit 6ad897f Jun 21, 2016 @weierophinney weierophinney Bumped version

README.md

zend-captcha

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Zend\Captcha component is able to manage “Completely Automated Public Turing test to tell Computers and Humans Apart” (CAPTCHA); 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 want to prevent spam submissions.