get list of arabic,persian files in a directory problem

[eluser]Unknown[/eluser]
i have a simple file search engine by CI,
i need to get name of all pdf fiels in a directory.
but the name of all files is arabic or persian,
i have problem with scandir for get right names,it dont work and return bad cahracters.
have you an idea?
thanks All.

[eluser]Rodrigo Alexandre[/eluser]
Here:

http://ellislab.com/codeigniter/user-gui...elper.html

Code:

get_filenames('path/to/directory/')