yii\rbac\DbManager::removeAll PHP Method

    public function removeAll()
    {
        $this->removeAllAssignments();
        $this->db->createCommand()->delete($this->itemChildTable)->execute();
        $this->db->createCommand()->delete($this->itemTable)->execute();
        $this->db->createCommand()->delete($this->ruleTable)->execute();
        $this->invalidateCache();
    }

 public function actionRemoveAll()
 {
     if ($this->confirm('Are you sure want to remove all authorization data, including roles, permissions, rules, and assignments?')) {
         $this->_authManager->removeAll();
     }
     return 0;
 }