codeigniter两个不同的file_upload需要两个不同的配置

Yup. The title says it all. I have two file upload functions in a view and they need two different configs to upload files.

echo form_label('Product Image') . form_upload('prod_image','');
echo form_label('Product Manual') . form_upload('prod_manual','');

As the names imply, the first upload form should contain only an image file and upload it to an image folder. The other should contain only a doc/pdf file and upload it to a manual folder.

In a controller, how can I give them two different configs? I can't find any info regarding it

Thank you in advance!

//open single form is enough and target to this method update the form field name appropriate to the document and image

//controlleer method
function do_upload()
{
 //upload image
  if($this->upload_image('field_name'))
  {
    //upload dsuccess
  }else{
     //error
  }

  //upload image
  if($this->upload_document('field_name'))
  {
    //upload dsuccess
  }else{
     //error
  }

}

//controlleer method
function upload_image($form_field_name)
{

    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|png';

    $this->load->library('upload', $config);

    if ( ! $this->upload->do_upload($form_field_name))
    {
    return false;
    }
    else
    {
       return true;
    }
}

//controlleer method
function upload_document($form_field_name)
{

    $config['upload_path'] = './uploads/';
   $config['allowed_types'] = 'doc|pdf';

    $this->load->library('upload', $config);

    if ( ! $this->upload->do_upload($form_field_name))
    {
    return false;
    }
    else
    {
       return true;
    }
}