/**
  * @api {delete} /admin/user/{id} 删除某个用户
  * @apiUse header
  *
  * @apiName deleteUser
  * @apiGroup User
  * @apiVersion 1.0.0
  *
  * @apiParam {String} username 该子会议的ID
  * @apiParam {String} name 该子会议名称 必选
  * @apiParam {String} organization 子会议的开始时间
  * @apiParam {Integer} title 子会议的结束时间
  * @apiParam {String} email 子会议举行场地
  * @apiParam {String} password 该子会议可接纳的人数
  *
  * @apiSuccess {Array} empty_array 空数组
  */
 public function deleteUser($id)
 {
     if (empty($id)) {
         return parent::required('id');
     }
     $where = 'id=' . $id . ' and isdeleted=0';
     $user = User::findFirst($where);
     if (empty($user)) {
         return parent::invalid('id', $id);
     }
     if (false == $user->delete()) {
         return parent::resWithErrMsg($user->getMessages(), 406);
     }
     $roleUser = new RoleUser();
     $roleUser->user_id = $id;
     if (false == $roleUser->delete()) {
         return parent::resWithErrMsg($roleUser->getMessages());
     }
     return parent::success();
 }