Tips & Tricks: CAPTCHA That Form
Tips & Tricks: CAPTCHA That Form Before It Gets Away!
by Ben Ramsey
php|architect
June 2005
From the introduction:
Has your blog (or that of a friend) been inundated with comment spam? Columnist Ben Ramsey brings back the Tips & Tricks column with an overview of ways to prevent this annoying side-effect of running a publicly-commentable website.