Multiple upload files with difference allowed file type

[eluser]budbud[/eluser]
hello.,

I'm newbie here.,
this is my first post^^

how are u doing all???
i hope u are good.

ok, let start with my problem in use codeigniter framework, where i want to upload multiple file in same form but with different allowed type (image n pdf).

how can i do that??
i already search how to solve this problem but i cann't find the best answer.

please anyone help me!
thanks before...