/nova/lib/vcode.class.php

<?php

!defined('IN_NOVA') && exit('Access Denied!');



class Vcode {


	private $sessionvar = 'vdcode';	//Session????


	public function show( $code_name = 'vdcode', $code_type = 1, $width = 50, $height = 20 ) {
		$this->sessionvar = $code_name;



		if (function_exists('imagecreate')) {



			//??+??????

			if ( $code_type == 1 ) {



				//??4?????????

				$str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

				$len = strlen($str);

				$code = array();

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

					$code[] = $str{mt_rand(0,$len-1)};

				}



				$_SESSION[$this->sessionvar] = strtolower(implode('',$code));



				$img = ImageCreate($width,$height);	//????

				ImageColorAllocate($img,255,255,255); //????



				//????

				for ($i=0; $i<100; $i++) {

					$pxcolor = ImageColorAllocate($img,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));

					ImagesetPixel($img,mt_rand(0,$width),mt_rand(0,$height),$pxcolor);

				}



				//????

				$bordercolor = ImageColorAllocate($img,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));

				ImageRectangle($img,0,0,$width-1,$height-1,$bordercolor);



				//???????

				$offset = round($width/4/2);

				$h1 = 0;

				$h2 = round($height/3);

				foreach ($code as $char) {			

					$textcolor = ImageColorAllocate($img,mt_rand(0,250),mt_rand(0,150),mt_rand(0,250));

					ImageChar($img,5,$offset + mt_rand(-5,round($width/4/3)), mt_rand($h1, $h2),$char,$textcolor);

					$offset += round($width/4)-3;

				}

	

			//?????????

			} elseif ( $code_type == 2 ) {



				$operator = '+-*';	//???



				$code = array();

				$code[] = mt_rand(1,9);

				$code[] = $operator{mt_rand(0,2)};

				$code[] = mt_rand(1,9);

				$code[] = $operator{mt_rand(0,2)};

				$code[] = mt_rand(1,9);

				$codestr = implode('',$code);

				eval("\$result = ".implode('',$code).";");

				$code[] = '=';



				$_SESSION[$this->sessionvar] = $result;



				$img = ImageCreate($width,$height);

				ImageColorAllocate($img, mt_rand(230,250), mt_rand(230,250), mt_rand(230,250));

				$color = ImageColorAllocate($img, 0, 0, 0);



				$offset = round($width/6/2);

				$h1 = 0;

				$h2 = round($height/6);

				foreach ($code as $char) {

			

					$txtcolor = ImageColorAllocate($img, mt_rand(0,255), mt_rand(0,150), mt_rand(0,255));

					ImageChar($img, mt_rand(3,5), $offset + mt_rand(-5,round($width/6/3)), mt_rand($h1, $h2), $char, $txtcolor);

					$offset += round($width/6)-3;



				}

				for ($i=0; $i<100; $i++) {

			

					$pxcolor = ImageColorAllocate($img, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));

					ImagesetPixel($img, mt_rand(0,$width), mt_rand(0,$height), $pxcolor);

				}



			}



			header("pragma:no-cache\r\n");

			header("Cache-Control:no-cache\r\n");

			header("Expires:0\r\n");

			//????????????????PNG->JPEG->GIF

			if (Imagetypes() & IMG_PNG) {

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

				ImagePNG($img);

			} elseif (Imagetypes() & IMG_JPEG) {

				header('content-type:image/jpeg');

				ImageJPEG($img);

			} else {

				header('content-type:image/gif');

				ImageGif($img);

			}

		}

	}


	public function check( $code ) {
		if( !isset( $_SESSION[$this->sessionvar] ) ) {
			return false;
		}
		if( $code != $_SESSION[$this->sessionvar] ) {
			unset( $_SESSION[$this->sessionvar] );
			return false;
		} else {
			unset( $_SESSION[$this->sessionvar] );
			return true;
		}
	}


}

?>