yii\rbac\PhpManager::removeAll PHP Method

    public function removeAll()
    {
        $this->children = [];
        $this->items = [];
        $this->assignments = [];
        $this->rules = [];
        $this->save();
    }

 /**
  * Initial RBAC action
  * @param integer $id Superadmin ID
  */
 public function actionInit($id = null)
 {
     $auth = new PhpManager();
     $auth->init();
     $auth->removeAll();
     //удаляем старые данные
     // Rules
     $groupRule = new GroupRule();
     $auth->add($groupRule);
     // Roles
     $user = $auth->createRole('user');
     $user->description = 'User';
     $user->ruleName = $groupRule->name;
     $auth->add($user);
     $moderator = $auth->createRole('moderator');
     $moderator->description = 'Moderator';
     $moderator->ruleName = $groupRule->name;
     $auth->add($moderator);
     $auth->addChild($moderator, $user);
     $admin = $auth->createRole('admin');
     $admin->description = 'Admin';
     $admin->ruleName = $groupRule->name;
     $auth->add($admin);
     $auth->addChild($admin, $moderator);
     // $auth->assign($admin, 1);
 }