public function listAction() { $data = array(); $psd = new PatientStatisticsDefinition(); $psdIterator = $psd->getIterator(); foreach ($psdIterator as $row) { $data[] = $this->_generateStatsRow($row); } $json = Zend_Controller_Action_HelperBroker::getStaticHelper('json'); $json->suppressExit = true; $json->direct(array('rows' => $data)); }