$download_count = $attachments['_'. $post_id][$i]['download_count'];
$physical_filename = $attachments['_'. $post_id][$i]['physical_filename'];
$download_link = "download.php?id=$attach_id";
$download_link = "/files/$physical_filename";
ну вот опять началось...blackjack, пишите в лс, помогу с готовым решением.