PHP: how to make rapidshare type captcha

now captcha decoder is very strong and effective.

how to use Image GD to put some object to captcha like rapidshare (is that font or image?)
i mean the cat and dog

i have a captcha ready made. how to modify its code.


class CaptchaSecurityImages {
 
	var $font = 'monofont.ttf';
 
	function generateCode($characters) {
		/* list all possible characters, similar looking characters and vowels have been removed */
		$possible = '23456789bcdfghjkmnpqrstvwxyz';
		$code = '';
		$i = 0;
		while ($i < $characters) { 
			$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
			$i++;
		}
		return $code;
	}
 
	function CaptchaSecurityImages($width='80',$height='24',$characters='6') {
		$code = $this->generateCode($characters);
		/* font size will be 75% of the image height */
		$font_size = $height * 0.75;
		$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
		/* set the colours */
		$background_color = imagecolorallocate($image, 255, 255, 255);
		$text_color = imagecolorallocate($image, 20, 40, 100);
		$noise_color = imagecolorallocate($image, 100, 120, 180);
		/* generate random dots in background */
		for( $i=0; $i<($width*$height)/3; $i++ ) {
			imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
		}
		/* generate random lines in background */
		/*for( $i=0; $i<($width*$height)/150; $i++ ) {
			imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
		}*/
		/* create textbox and add text */
		$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
		$x = ($width - $textbox[4])/2;
		$y = ($height - $textbox[5])/2;
		imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
		/* output captcha image to browser */
		header('Content-Type: image/jpeg');
		imagejpeg($image);
		imagedestroy($image);
		$_SESSION['security_code'] = $code;
	}
 
}
 
$width = isset($_GET['width']) ? $_GET['width'] : '80';
$height = isset($_GET['height']) ? $_GET['height'] : '24';
$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';
 
$captcha = new CaptchaSecurityImages($width,$height,$characters);

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LVL 2
aliccaAsked:
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afzzConnect With a Mentor Commented:
Rapidshare captcha is a font. You can/may achieve this
by doing the follwing:

1. If your captcha has 4 chars, put them in an array
2. create another array of 4 chars randomly
3.  print both the arrays in a random order one with a cat font and one with a dog font. The cat font can be the actual captcha.

Sorry, i could not see your code now. Maybe someone else can suggest how you could alter it to achieve the above.
0
 
aliccaAuthor Commented:
i got the idea, but may try
0
 
aliccaAuthor Commented:
good
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