public function index()
 {
     import('QRCode');
     $QRCode = new QRCode('', 150);
     $img_url = $QRCode->getUrl("http://blog.51edm.org");
     echo '<img src="' . $img_url . '" />';
 }
 protected function getQRCode($url = NULL)
 {
     if (IS_POST) {
         $this->assign("QRcodeUrl", "");
     } else {
         //            $url = empty($url) ? C('WEB_ROOT') . $_SERVER['REQUEST_URI'] : $url;
         $url = empty($url) ? C('WEB_ROOT') . U(MODULE_NAME . '/' . ACTION_NAME) : $url;
         import('QRCode');
         $QRCode = new QRCode('', 80);
         $QRCodeUrl = $QRCode->getUrl($url);
         $this->assign("QRcodeUrl", $QRCodeUrl);
     }
 }