export to csv via php does not work in firefox - php

Question

I'm trying to fetch and download data using php to csv file, for task i found a good answer, this is working for me on all browser except firefox.
$s = $master->getUser();
function array2csv(array &$array)
{
if (count($array) == 0) {
return null;
}
ob_start();
$df = fopen("php://output", 'w');
fputcsv($df, array_keys(reset($array)));
foreach ($array as $row) {
fputcsv($df, $row);
}
fclose($df);
return ob_get_clean();
}
function download_send_headers($filename) {
/*header("Content-Type: application/csv");
header("Content-Disposition: attachment; filename={$filename}");
// Disable caching
header("Cache-Control: no-cache, no-store, must-revalidate"); // HTTP 1.1
header("Pragma: no-cache"); // HTTP 1.0
header("Expires: 0"); // Proxies*/
// disable caching
$now = gmdate("D, d M Y H:i:s");
header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");
header("Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate");
header("Last-Modified: {$now} GMT");
// force download
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
// disposition / encoding on response body
header("Content-Disposition: attachment;filename={$filename}");
header("Content-Transfer-Encoding: binary");
header("Content-Disposition: attachment;filename={$filename}");
header("Content-Transfer-Encoding: binary");
}
download_send_headers(site_title .' '. date("d M Y") . ".csv");
echo array2csv($s);
die();
In Firefox file extension does not showing in csv, it is looking like application file.

Answer 1

Have you tried removing these in your code:
header("Content-Type: application/force-download");
header("Content-Type: application/download");
Just retain:
header("Content-Type: application/octet-stream");