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Description:

Animal Captcha is a PHP program created for web developers who need a secure spam control for HTML forms. It displays a random image picked from a list of animals which only humans can recognize.

• Try the example! (in English and Spanish)

Advantages:

• Nice look: better than an ugly alphanumeric string.
• Fast: users can identify an animal faster than several mixed letters.
• Effective: less wrong answers.
• Secure: the main reason. Some alphanumeric captchas you can find on the Internet are really difficult to be recognized by a bot, but with an animal it’s almost impossible!
• Multi-language: available in some languages, multiple valid names for each animal.

Documentation:

Animal Captcha is divided into two PHP files and one folder containing some images.

• animal-captcha.php - Returns a random image and saves the name of the animal in a session variable for being checked later.
• animal-captcha-check.php - It defines animal_captcha_check() function. It returns true if user answer is OK, and false if it’s wrong.
• Folder images - They must be JPG format, a 120×120 px size, showing a very common animal which everybody knows. Names are composed with some words separated by dashes. Each word represents a valid answer for the same animal (eg: cerdo-pig-porc.jpg).

By this way you can easily adding new languages or solving problems about animals which have some different names.

Histograma test passed.

Download:

• Animal Captcha 1.2 [197kb .zip] (03 May 2008)

Published under Creative Commons 3.0 license. You can use or modify all you want, but you must attribute the work to the original author: GONZO (Javier González), of Blogs Teoriza.

Sorry about my bad English, i hope it will be useful!