public function getExpiryAlertAction()
{
$province = $this->_request->getParam('province', '');
$product = $this->_request->getParam('product', '');
$district = $this->_request->getParam('district', '');
$level = $this->_request->getParam('level', '');
$geoModel = new Model_Geo();
if ($level == 4) {
$return = $geoModel->getExpiryDistrict($province, $product);
} else {
$return = $geoModel->getExpiryTehsil($province, $district, $product);
}
echo Zend_Json::encode($return);
}