Hello there!
I would like to give you all a tip about a free reCaptcha service that i´m currently using for validation form submission in my comment system in a future version of my swedish blog.
And by the way i coded the blog system myself from the ground up not based on anything out there cause i felt it diden´t work the way i wanted. And it´s a good experience to try it yourself.
Anyway back to buisness.
The service i´m talking about is:
http://www.recaptcha.com
And if you follow this link you can see they have a PHP API to access this functionality.
http://recaptcha.net/plugins/php/
I had for a while big problems with foreign spam-bots submiting spam to comments on al my blogposts and i tryed working in all kinds of security and prevention into my code myself but to no avail. So i browsed around the internet mad at myself for not being able to protect my site and such, when i stumbled on the above mentioned service.
Now that im using it, the spam has been Zero, Zip, Nada, Nothing.
Give it a try and tell me what you think, and any experience you might have with it.
Excuse my english ;) just a poor swedish PHP programmer ;)
/EyeDentify