<?php/** ** @package VC* @version $Id: captcha_gd.php,v 1.19 2007/01/26 16:07:43 acydburn Exp $* @copyright (c) 2006 phpBB Group * @license http://opensource.org/licenses/gpl-license.php GNU Public License **//*** Based on PHP-Class hn_captcha Version 1.3, released 11-Apr-2006* Original Author - Horst Nogajski, horst@nogajski.de** @package VC*/class captcha{	var $width = 240;	var $height = 60;	var $captcha_gd_noise = 1;	function execute($code, $seed)	{		global $config;		$stats = gd_info();				$bundled = (substr($stats['GD Version'], 0, 7) === 'bundled') ? true : false;		preg_match('/[\\d.]+/', $stats['GD Version'], $version);		$gd_version = (version_compare($version[0], '2.0.1', '>=')) ? 2 : 1;		// create the image, stay compat with older versions of GD		if ($gd_version === 2)		{			$func1 = 'imagecreatetruecolor';			$func2 = 'imagecolorallocate';		}		else		{			$func1 = 'imagecreate';			$func2 = 'imagecolorclosest';		}		$image = $func1($this->width, $this->height);		if ($bundled)		{			imageantialias($image, true);		}		// seed the random generator		mt_srand($seed);		// set background color		$back = imagecolorallocate($image, mt_rand(224, 255), mt_rand(224, 255), mt_rand(224, 255));		imagefilledrectangle($image, 0, 0, $this->width, $this->height, $back);		// allocates the 216 websafe color palette to the image		if ($gd_version === 1)		{			for ($r = 0; $r <= 255; $r += 51)			{				for ($g = 0; $g <= 255; $g += 51)				{					for ($b = 0; $b <= 255; $b += 51)					{						imagecolorallocate($image, $r, $g, $b);					}				}			}		}				// fill with noise or grid		if ($this -> captcha_gd_noise)		{			$chars_allowed = array_merge(range('1', '9'), range('A', 'Z'));			// random characters in background with random position, angle, color			for ($i = 0 ; $i < 72; $i++)			{				$size	= mt_rand(8, 23);				$angle	= mt_rand(0, 360);				$x		= mt_rand(0, 360);				$y		= mt_rand(0, (int)($this->height - ($size / 5)));				$color	= $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));				$text	= $chars_allowed[mt_rand(0, sizeof($chars_allowed) - 1)];								imagettftext($image, $size, $angle, $x, $y, $color, $this->get_font(), $text);			}			unset($chars_allowed);		}		else		{			// generate grid			for ($i = 0; $i < $this->width; $i += 13)			{				$color	= $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));				imageline($image, $i, 0, $i, $this->height, $color);			}			for ($i = 0; $i < $this->height; $i += 11)			{				$color	= $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));				imageline($image, 0, $i, $this->width, $i, $color);			}		}		$len = strlen($code);				for ($i = 0, $x = mt_rand(20, 40); $i < $len; $i++)		{			$text	= strtoupper($code[$i]);			//echo "text=$text ; code=$code -".strlen($code); exit;				$angle	= mt_rand(-30, 30);						$size	= mt_rand(20, 40);			$y		= mt_rand((int)($size * 1.5), (int)($this->height - ($size / 7)));			$color	= $func2($image, mt_rand(0, 127), mt_rand(0, 127), mt_rand(0, 127));			$shadow = $func2($image, mt_rand(127, 254), mt_rand(127, 254), mt_rand(127, 254));						$font = $this->get_font();			imagettftext($image, $size, $angle, $x + (int)($size / 15), $y, $shadow, $font, $text);			imagettftext($image, $size, $angle, $x, $y - (int)($size / 15), $color, $font, $text);			$x += $size + 4;		}		// Output image		header('Content-Type: image/png');		header('Cache-control: no-cache, no-store');		imagepng($image);		imagedestroy($image);	}	function get_font()	{		static $fonts = array();			if (!sizeof($fonts))		{			global $phpbb_root_path;						$dr = @opendir(FSROOT.'lib/captcha/fonts');			if (!$dr)			{				trigger_error('Unable to open includes/captcha/fonts directory.', E_USER_ERROR);			}			while (false !== ($entry = readdir($dr)))			{				if (strtolower(pathinfo($entry, PATHINFO_EXTENSION)) == 'ttf')				{					$fonts[] = FSROOT.'lib/captcha/fonts/' . $entry;				}			}			closedir($dr);		}				return $fonts[mt_rand(0, sizeof($fonts) - 1)];	}}?>