Bots, they're annoying, but what can you do about them? For blog comments, and similar applications, you have the wonderful Akismet filter, but what about other things? You could always use a CAPTCHA, one of those boxes where you enter the jumbled letters shown in an image. ReCAPTCHA provides such a service, with a unique twist. It helps old books be scanned into digital form, using CAPTCHA results to fix words that their computers couldn't read. A user is shown two words, one that ReCAPTCHA knows and one it doesn't, and has the user type both in. If the first word matches, it stores the value the user entered for the second, so the Internet Archive can aggregate the results and automatically figure out what the word is.
PHP is one of the most popular programming languages for the web. Sometimes a feature-friendly language can help the programmer too much, and security holes can creep in, creating roadblocks in the development path. In this tutorial, we will take a look at 5 tips to help you avoid some common PHP security pitfalls and development glitches.
FUENTE:
http://net.tutsplus.com/tutorials/php/5-helpful-tips-for-creating-secure-php-applications/
