とにかく何でもコンテンツをダウンロードさせる方法

$path = ファイルへのパス;
$basename = basename($path);

header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Transfer-Encoding: binary");
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="' . $basename . '"');
header('Content-Length: ' . filesize($path));
header('Cache-Control: max-age=0');

$result = readfile($path);
exit();