Renaming image on upload?

[eluser]ywftdg[/eluser]
I have been trouble trying to get this renaming stuff to work at all, but no go. I tryed the latest post on here, but this causes a big error saying I cannot modify headers, etc...no idea. Has anyone out there mastered this uploading and renaming process? I am trying to take whatever they upload, set it to 777 and then rename it to $id + [ext]. Do I need to upload the item, then run another if statement to check for the file, then run the thumbnail and make a copy to get a new name? Right now the thumbnail doesn't work either if I add it into the current configs.

My current code (minus any renaming because it isnt working):

Code:

if ($this->input->post('mypageupdate')) {        
            
            //     Designers Upload Folder
            $dir = './assets/images/'.$id.'/';
            
            //    Make Directory
            if (!is_dir($dir)) {
                $theupload_path = mkdir('./assets/images/'.$id.'/', 0777);
            }
            
            
            $config['upload_path'] = $dir;
            $config['allowed_types'] = 'gif|jpg|png';
            $config['remove_spaces']  = TRUE;
            $config['quality']  = '90';  
            $config['max_size'] = '1000000';
            $this->upload->initialize($config);
            
            if (!$this->upload->do_upload())    {
                $data['error'] = 'There was a problem with your upload!';
            
            } else {
                
                $data = array('upload_data' => $this->upload->data());
                $filepath = $data['upload_data']['file_name'];
                
                $data = array(
                $this->input->post('nickname'),
                $this->input->post('bio'),
                $this->input->post('web'),
                $filepath
                );
        
                $this->designer->update_mypage($id,$data);
                $this->session->set_flashdata('message', 'Mypage Updated!');
                
                redirect('designers/mypage');
                
            }
        }