/**
  *{tablename,id,key,value of key}
  **/
 private function update($table = 'wpl_room_types', $id, $key, $value = '')
 {
     $res = wpl_room_types::update($table, $id, $key, $value);
     $res = (int) $res;
     $message = $res ? __('Operation was successful.', WPL_TEXTDOMAIN) : __('Error Occured.', WPL_TEXTDOMAIN);
     $data = NULL;
     $response = array('success' => $res, 'message' => $message, 'data' => $data);
     echo json_encode($response);
     exit;
 }