public function doDeletePortfolioAction()
 {
     $this->_helper->layout->disableLayout();
     $this->_helper->viewRenderer->setNoRender();
     $ajaxRes = array('success' => 0, 'info' => null);
     if ($this->getRequest()->isXmlHttpRequest()) {
         $params = $this->getRequest()->getParams();
         $core = new PR_Api_Core_CandidateClass();
         if (!empty($params['data']) && sizeof($params['data']) > 0) {
             foreach ($params['data'] as $key => $value) {
                 $core->deleteCandidatePortfolio($value);
             }
         }
     }
     $ajaxRes['success'] = 1;
     $response = $this->getResponse();
     $response->clearAllHeaders()->clearBody();
     $ajaxRes = json_encode($ajaxRes);
     $response->setHeader('Content-type', 'application/json');
     $response->setHeader('Content-Length', strlen($ajaxRes), true)->setBody($ajaxRes);
 }