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www.phpcaptcha.org

A free open-source PHP CAPTCHA script for generating complex CAPTCHA images and audio files. Easy to integrate and customize.

github.com/claviska/simple-php-captcha

A simple PHP CAPTCHA script. Contribute to simple-php-captcha development by creating an account on GitHub.

www.abeautifulsite.net/a-simple-php-captcha-script

Jan 16, 2011 ... This is one of the easiest CAPTCHA scripts you will ever use. While it doesn't obscure the text, it will serve its purpose well for many people ...

99webtools.com/blog/php-simple-captcha-script

Mar 12, 2013 ... A CAPTCHA is a type of challenge-response test used in website as an attempt to ensure that the response is generated by a human being.

www.the-art-of-web.com/php/captcha

Presenting a simple PHP script for generating a CAPTCHA and using it to block spammers from submitting your online forms.

developers.google.com/recaptcha/old/docs/php

If you want to use the PHP library to display ... or the CAPTCHA may not show on some ...

tympanus.net/codrops/2009/09/22/21-free-captcha-sources

Sep 22, 2009 ... Here is a collection of free CAPTCHA scripts and services than you can easily integrate into your website using PHP or JavaScript: 1.

www.sitepoint.com/simple-captchas-php-gd

Mar 5, 2014 ... Mehul Jain explains how captchas work and demonstrates their implementation with PHP and the GD image library.

krasimirtsonev.com/blog/article/PHP-simple-captcha-script

blog / PHP. In my company, we have a lot of WordPress sites. Some of them require contact form with captcha field. The short way for solving such task is to use ...