yii\rbac\DbManager::revoke PHP Method

    public function revoke($role, $userId)
    {
        if (empty($userId)) {
            return false;
        }
        return $this->db->createCommand()->delete($this->assignmentTable, ['user_id' => (string) $userId, 'item_name' => $role->name])->execute() > 0;
    }

 public function revoke($role, $userId)
 {
     if ($this->cache !== null) {
         $this->cache->delete($this->assignmentsCachePrefix . '_' . $userId);
     }
     parent::revoke($role, $userId);
 }