[webdesigner93]

Below is the code for a simple captcha i made i attached the captcha image to this post

 <?php
session_start();

$md5 = md5(microtime() * mktime());
$string = substr($md5,0,7);	
$cap = imagecreatefrompng("captcha.png");
$green = imagecolorallocate($cap,000,102,068); 
$blue = imagecolorallocate($cap,017,017,051); 
imageline($cap,39,5,65,33,$green);
 imageline($cap,81,7,5,31,$green);
 imageline($cap,0,7,82,25,$green);

imagestring($cap,5,20,10,$string,$blue);
$_SESSION['key'] = md5($string);


header("Content-type: image/png");

imagepng($cap);
?>

And when done the captcha should look like the image below

 pic.jpg (11.98K)
Number of downloads: 3

Attached File(s)

•  captcha.png (332bytes)
  Number of downloads: 4

[Acuity]

nice

[Peosan]

Cool, thanks!

[rallport]

Nice and simple, but you should really put this in a class of its own.

[Gareth Daine]

Decent, but I'd just use reCAPTCHA.

http://recaptcha.net/