<?php
//パス
$id = $_GET["id"];

if( !in_array($id, array(2,3,4,5,6)) ){
	exit();
}
$fpath = './bgm/bgm' . $id . ".mp3";

//ファイル名
$fname = array("BLUE REFLECTION-X`mas ver-.mp3","BLUE REFLECTION.mp3","hallucination And hope.mp3","dlmusic_03.mp3","dlmusic_04.mp3");

header('Content-Type: application/force-download');
header('Content-Length: '.filesize($fpath));
header('Content-disposition: attachment; filename="'.$fname[$id-2].'"');
readfile($fpath);