## 代碼 ``` <?php namespace app\admin\validate; use think\Validate; use think\Db; class AdminMenuValidate extends Validate { protected $rule = [ 'name' => 'require', 'app' => 'require', 'controller' => 'require', 'parent_id' => 'checkParentId', 'action' => 'require|unique:AdminMenu,app^controller^action', ]; protected $message = [ 'name.require' => '名稱不能為空', 'app.require' => '應用不能為空', 'parent_id' => '超過了4級', 'controller.require' => '名稱不能為空', 'action.require' => '名稱不能為空', 'action.unique' => '同樣的記錄已經存在!', ]; protected $scene = [ 'add' => ['name', 'app', 'controller', 'action', 'parent_id'], 'edit' => ['name', 'app', 'controller', 'action', 'id', 'parent_id'], ]; // 自定義驗證規則:菜單只能三級 protected function checkParentId($value) { $find = Db::name('AdminMenu')->where(["id" => $value])->value('parent_id'); if ($find) { $find2 = Db::name('AdminMenu')->where(["id" => $find])->value('parent_id'); if ($find2) { $find3 = Db::name('AdminMenu')->where(["id" => $find2])->value('parent_id'); if ($find3) { return false; } } } return true; } } ```