$_FILES Array getting empty when using $this->form_validation->run()

That's probably they're 2 different posts and you are trying to combine the second one (uploading image) to the first one. But they're not in the same form->validation ?? Try combining them together or put them in seperate views.

I hope this page will help you about form validation for uploads.

Buddy ! 

I got the point.  But i need the last inserted id to insert image details to table.  Then how i i can do that? 
Upload image option i used for uploading  property images along with property data.  
If i use two post into differently how i can get the refeence of the last insert record.  I mean the $result variable.