About moving a dir to other dir

[eluser]Rubiz'[/eluser]
Hi all, I'm with a problem:

I need to move a dir with PHP or CI, I'm trying to copy the dir and paste it in a destination dir, with the copy() PHP function, but it seams dont be right. Dont return errors. But I really dont know if I can use this function to move dirs, instead of files.

Do'u have some function to help me, or some method, something like?

I never did that before, need help, thanx.