Non Spam Graphics Generator

[Lop]

Anyone got any code or know of a tutorial (or can point me in the right direction) for creating a "Non Spam" image creator? These are the ones that you can hardly read when you go to search or register for a website and you have to type in what it says. Usually they have odd letters thrown together.

[John]

maybe something like this

PHP Code:

<?php
//named image.php
header("Content-type: image/png");
$im = @imagecreate(100, 50)
   or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 255, 255, 255);
$text_color = imagecolorallocate($im, 233, 14, 91);
$string = rand(10, 10);
imagestring($im, 1, 5, 5,  $string, $text_color);
imagepng($im);
imagedestroy($im);
?>

creates a random number 10 characters long and then generates it over an image

and you can call it by using

<img src="image.php" />

or just use it in the body of your code and create a validation to check if the user inputed form value is the same as $string

[TcM]

I think this is called CAPTCHA?

[John]

yep thats what its called, my version is very basic and will stop most spammers

i believe you can get a free one from here
http://captchas.net/

[TcM]

Yeah basic and simple but effective! thats how things should be!
Even I who dont know PHP ( but I have a good programming background ) I understood all lines of code so its simple but well it does what it should do!

[Lop]

Thank you! This is exactly what I needed!

[xXHalfSliceXx]

I don't think there hasn't been a problem resolved yet!

Good stuff guys. I don't think i have the current talent to do that yet.

[John]

you just have to watch out, if your website is popular and very prone to spam, there are algorithms that can read basic captchas that dont have any distortion

[Cosmet]

Here are some other examples:

http://captchas.net/sample/php/
http://www.nogajski.de/horst/php/captcha/
http://codewalkers.com/tutorials/95/1.html

[TcM]

Nice links! But I couldn't get to the 3rd link coz it wouldn't load!