將發送來的參數轉為數組
```
$filter = $this->request->get("filter", '');
$tempFilter = json_decode($filter, true) ?? [];
```
將參數取出后刪除原數組的值 然后將數組轉回去
```
unset($tempFilter['add_uid']);
$filter = json_encode($tempFilter);
```
重新賦值 where
```
list($where, $sort, $order, $offset, $limit) = $this->buildparams(null, null, $filter);
```
common/controller/backend.php
buildparams方法加參數
