We cant consider operation is succesful in come cases. Compare PhpManager workflow with DbManager workflow. It row is already removed something wrong (maybe) here. Its like we open rbac.php PhpManager file and remove array key. I suggest to stay it as it is. For example scenario when one user is admin. We can not care about `removeItemChild()` result value. But when we have complex many user appliaction we can want care about is. For example we both admins. I open form and wait. You open form and remove item child. Now i try to remove item child. I want notify user that somewho removed this already. This feature is very important for many user application. If we stay code as it is. You can just do:

```
$authManager->removeItemChild(); //do not care about result
```

and for some cases

```
$result = $authManager->removeItemChild(); //care about result, many user apps
```