/Framework/Component/Captcha.php

<?php

/**

 * ????

 * 

 * [Code]

 * $c = App::C('Captcha');

 * $c->display(1, array('bordercolor'=>'#C5C5C5', 'width'=>148, 'height'=>26));

 * [/Code]

 * 

 * @version $Id: Captcha.php 312 2012-03-06 09:00:15Z linsir123 $

 * @package Component

 */

class comCaptcha

{

	/**

	 * @var ??,??????????

	 */

	public $options = array('bordercolor'=>null, 'width'=>70, 'height'=>21);

	

	/**

	 * @var ???

	 */

	public $code;

	

	/**

	 * @var ????

	 */

	public $expired;

	

	/**

	 * @var ????

	 */

	private $_im;

	

	/**

	 * @var ????

	 */

	private $_width;

	

	/**

	 * @var ????

	 */

	private $_height;

	

	/**

     * ????

     */

	public function __construct()

	{

		@session_start();

		$this->code = isset($_SESSION['CaptchaCode']) ? $_SESSION['CaptchaCode'] : '';

		$this->expired = isset($_SESSION['CaptchaExpired']) ? $_SESSION['CaptchaExpired'] : 0;

	}

	

	/**

	 * ????

	 * 

	 * @param int $type ???????

	 * @param array $options ????

	 */

	public function display($type = 0, $options = array())

	{

		$this->_code($type);

		

		///

		if (is_array($options)) 

			$this->options = array_merge($this->options, $options);

			

		$this->_width = intval($this->options['width']);

		$this->_height = intval($this->options['height']);

		$this->_background();

		$this->_ttfont();

		

		///

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

		imagepng($this->_im);

		imagedestroy($this->_im);

	}

    

	/**

	 * ???????????

	 * 

	 * @param string $code ????????

	 * @return bool

	 */

	public function check($code)

	{

		return (time() < $this->expired && strtoupper($code) == strtoupper($this->code));

	}

	

	

	/// ??????? ///

	

	

	/**

	 * ????

	 */

	private function _background()

	{

		$this->_im = imagecreate($this->_width, $this->_height);

		

		///

		for($i = 0; $i < 3; $i++) {

			$start[$i] = mt_rand(200, 255);

			$end[$i] = mt_rand(100, 150);

			$step[$i] = ($end[$i] - $start[$i]) / $this->_width;

			$c[$i] = $start[$i];

		}

		for($i = 0; $i < $this->_width; $i++) {

			$color = imagecolorallocate($this->_im, $c[0], $c[1], $c[2]);

			imageline($this->_im, $i, 0, $i, $this->_height, $color);

			$c[0] += $step[0];$c[1] += $step[1];$c[2] += $step[2];

		}

		

		///

		$linenums = $this->_height / 10;

		for($i=0; $i <= $linenums; $i++) {

			$color = imagecolorallocate($this->_im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

			$x = mt_rand(0, $this->_width);

			$y = mt_rand(0, $this->_height);

			if (mt_rand(0, 1))

				imagearc($this->_im, $x, $y, mt_rand(0, $this->_width), mt_rand(0, $this->_height), mt_rand(0, 360), mt_rand(0, 360), $color);

			else

				imageline($this->_im, $x, $y, $linex + mt_rand(0, $linemaxlong), $liney + mt_rand(0, mt_rand($this->_height, $this->_width)), $color);

		}

		

		///

		if ($this->options['bordercolor']) {

			list($r, $g, $b) = lpString::hex2rgb($this->options['bordercolor']);

			$color = imagecolorallocate($this->_im, $r, $g, $b);

			imagerectangle($this->_im, 0, 0, $this->_width - 1, $this->_height - 1, $color);

		}

	}

	

	/**

	 * ????

	 */

	private function _ttfont()

	{

		$widthtotal = 0;

		$seccode = $this->code;

		$seccodelength = strlen($seccode);

		for ($i = 0; $i < $seccodelength; $i++) {

			$font[$i]['font'] = dirname(__FILE__).DS.'fonts/verdanab.ttf';

			$font[$i]['size'] = 12;

			$box = imagettfbbox($font[$i]['size'], 0, $font[$i]['font'], $seccode[$i]);

			$font[$i]['height'] = max($box[1], $box[3]) - min($box[5], $box[7]);

			$font[$i]['width'] = (max($box[2], $box[4]) - min($box[0], $box[6])) + mt_rand(0, $this->_width / 8);

			$font[$i]['width'] = $font[$i]['width'] > $this->_width / $seccodelength ? $this->_width / $seccodelength : $font[$i]['width'];

			$widthtotal += $font[$i]['width'];

		}

		

		///

		$x = mt_rand(1, $this->_width - $widthtotal);

		for ($i = 0; $i < $seccodelength; $i++) {

			$fontcolor = array(mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

			$text_shadowcolor = imagecolorallocate($this->_im, 255 - $fontcolor[0], 255 - $fontcolor[1], 255 - $fontcolor[2]);

			$text_color = imagecolorallocate($this->_im, $fontcolor[0], $fontcolor[1], $fontcolor[2]);

			$y = mt_rand($font[$i]['height'] + 2, $this->_height - 5);

			imagettftext($this->_im, $font[$i]['size'], 0, $x + 1, $y + 1, $text_shadowcolor, $font[$i]['font'], $seccode[$i]);

			imagettftext($this->_im, $font[$i]['size'], 0, $x, $y, $text_color, $font[$i]['font'], $seccode[$i]);

			$x += $font[$i]['width'];

		}

	}

	

	/**

	 * ?????

	 * 

	 * @param int $type ???????

	 */

	private function _code($type)

	{

		switch ($type) {

			case 1:

				$seed = '0123456789';

				break;

			case 2:

				$seed = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

				break;

			default:

				$seed = '012346789ABCDEFGHJKLMNPQRTUVWXYZabcdefghijklmnopqrstuvwxyz';

				break;

		}

		

		///

		$this->code = '';

		list($usec, $sec) = explode(' ', microtime());

		srand($sec + $usec * 100000);

		for ($i = 0; $i < 4; $i++) 

			$this->code .= substr($seed, rand(0, strlen($seed) - 1), 1);

			

		$_SESSION['CaptchaCode'] = $this->code;

		$_SESSION['CaptchaExpired'] = $this->expired = time() + 900;

	}

}