Animal Captcha 1.3, a graphical spam control
Spanish | English
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 120x120 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 1.3 [197kb .zip] (03 Oct 2009)
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!