Posts tagged Spam

On the Internet, Nobody Knows You’re a Bot.

Ever get hit with spam through the contact or guestbook form on your site? Well, here is a short tutorial on how to build a custom captcha.
Captcha (Completely Automated Public Turing Test To Tell Computers and Humans Apart) is a program that can generate and grade tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown above, but current computer programs can’t.

Since Christmas is getting close, then I am taking the time to make the program simple Captcha using PHP function imagettftext() that allow us add text to an image using True Type fonts.

I use the font Kingthings Christmas 2.2 made by Kevin King. (Hi Kevin, thank you!)
Download source code :

http://ditatompel.crayoncreative.net/v2/archive/christmas-captcha.zip or
http://ubuntuone.com/p/SeA/ or
Google Docs

now on to the actual guide, (more…)