Security Code Script

I'm developing a web form that's going to be public and with the rash of form spam I've seen on other public forms, I'd like to include a security code to validate that it is not a bot sending in the script.

I could probably develop my own with imagemagick and php, but I'm wondering if anybody doesn't have a link out there to an existing script that will handle this for me and works well.

 

http://pear.php.net/package/Text_CAPTCHA

 

I use http://www.cocoavillagepublishing.com/development/tools/php/scripts/ and it works perfectly

 

You can create a random number for validation

 

OK... for all us newbies out there....... explain please!!!!!

 

Well, you could do something like :
<?
sessionstart();
$validate = mt_rand(0,100);
session_register("validate");
?>
And then print out $validate later and compare that to a posted value. Not such a bad idea, except any automated bot could read the value since you printed it.

 

To get started this is ok. But as nevetS said, a smart bot could read the random number and beat your security system. An image would be much more difficult to read by the bot.

I am also using http://www.cocoavillagepublishing.com/development/tools/php/scripts/