How to change data which is init by autoloader?

[eluser]liren[/eluser]
[quote author="toopay" date="1302251795"]configure some 'pre_controller' hook to handle that.[/quote]

Thank you toopay:

But what I want to do is change global value which is initialize by autoloader.otherthan change the value before I call a controller.
For example,I autoload a $var="hello" to memory,how to change the value of $var while system running?
I initial a tree class on app started. This tree is a menu structure.Web administrator could edit the menu structure in app console. So I want to know how to do it. Thanks！