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I have a php script that shows image of cats and dogs and you have to select all cats. It pulls the images from two different folders. I can get it to work by modding newthread.php, newreply.php and the post_captcha template.

I would love to have this as a plugin for MyBB but I am not smart enough to do it. To out smart the spambots all I have to do is change the images every so often.

<?php
define('CAPTCHA_NR',5);
define('CAPTCHA_CAT',1);
define('CAPTCHA_DOG',0);
define('CAPTCHA_IMG_NR',20);


session_start();

//if we have an image request serve the image
if ( isset( $_GET['captcha'] ) )
{
	header('Content-Type: image/jpeg');

	if ( $_SESSION['_captcha'][ $_GET['captcha'] ]  == CAPTCHA_DOG )
	{
		exit( readfile( dirname(__FILE__) . '/dogs/' . rand( 1, CAPTCHA_IMG_NR)  . '.jpg' ) );
	} else
	{
		exit( readfile( dirname(__FILE__) . '/cats/' . rand( 1, CAPTCHA_IMG_NR)   . '.jpg' ) );
	}
}

//check if the cats were checked
if ( isset( $_POST['_captcha'] ) )
{
	$captcha_ok = true;
	//check if the user checked the cats
	for ( $i = 1; $i <= CAPTCHA_NR; $i++ )
	{
		//if the checkboxes are not set assume that they are dogs
		if ( ! isset( $_POST['_captcha'][$i] ) ) $_POST['_captcha'][$i] = 0;	

		//do we have a match ?	 
		if ( $_SESSION['_captcha'][$i] != $_POST['_captcha'][$i] )
		{	
			$captcha_ok = false;
			break;
			//wrong guess
		}
	}
}

//generate images permutation

//make them all dogs
for ( $i = 1; $i <= CAPTCHA_NR; $i++ )
{
	$_SESSION['_captcha'][$i] = CAPTCHA_DOG;
}


//add at least one cat, but no more than half of the images
for ( $i = 1; $i <= (CAPTCHA_NR / 2); $i++ )
{
	$_SESSION['_captcha'][rand(1, CAPTCHA_NR) ] = CAPTCHA_CAT;
}
?>
<html>
<head>
<style>

#captcha
{
	width:400px;
	margin:10px;
}

#captcha div 
{
	float:left;
	margin:5px;
	background:#ccc;
	height:auto;
	text-align:center;
	width:50px;
}
#captcha input
{
	width:1em;
	display:block;
}

.captcha_message
{
	color:red;	
	font-size:1.2em;
	margin:10px;
}
</style>


</head>
<body>

		</p>
		<p><b class="captcha_message">
		<?php 
			if ( isset( $captcha_ok ) )
			{
				if ( $captcha_ok == true )
				{
					echo 'You are a human !';
				}
				else
				{
					echo 'Not a kittie lover or bad spam robot !!!';
				}
			}
		?>
		</b></p>
		<p><font color="#FF0000"><h4> Human Test. Please Select All Cats From The Images Below</h4></font></p>
		<div id="captcha">
		<?php for ( $i = 1; $i <= CAPTCHA_NR; $i++ ):?>
			<div>
				<input type="checkbox" name="_captcha[<?php echo $i;?>]" value="1">
				<img src="catdogcaptcha.php?captcha=<?php echo $i?>&time=<?php echo time();?>">
			</div>
		<?php endfor ?>
		</div>
		</p>
	

</body>
</html>

If you would like to see it work go here. http://rickmick.com

Please feel free to try it out the site is a test site for right now.

SouthernPride

SouthernPride