function download($id)
{
$knowledge = new Knowledge_file($id);
$knowledge->counter();
$this->load->helper('download');
$data = file_get_contents("uploads/knowledge/" . basename($knowledge->file));
$name = basename($knowledge->file);
force_download($name, $data);
}
function document_delete($id)
{
$knowledge = new Knowledge_file($id);
$knowledge->delete();
set_notify('success', lang('delete_data_complete'));
redirect($_SERVER['HTTP_REFERER']);
}