if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
			$browserCachedCopyTimestamp = strtotime(preg_replace('/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE']));
			if($browserCachedCopyTimestamp + 604800 > time()){
				header("http/1.1 304 Not Modified");
				header ("Expires: " . gmdate ("r", (time() + 604800)));
				header ("Cache-Control: max-age=604800");
				exit;
			}
		}
		$id=I('get.id',0,'intval');
		$file = UPLOAD_IMG_PATH . 'qccode/' . $id . '.png';
		if(file_exists($file)){
			header ("Last-Modified: " . gmdate ('r', time()));
			header ("Expires: " . gmdate ("r", (time() + 604800)));
			header ("Cache-Control: max-age=604800");
			header ("Pragma: public");
			Header ("Content-type: image/png");
			echo file_get_contents($file);
		}else{
			$qr = \APPlib\get_app_lib('phpqrcode',false);
			$site = C('SITE_URL');
			$value=$site . $id . '.html';
			$errorCorrectionLevel = "L";
			$matrixPointSize = "4.5";
			\QRcode::png($value, $file, $errorCorrectionLevel, $matrixPointSize);
			echo file_get_contents($file);
		}