Force download CSV file

csv_download.php

function forceCSVFileDownload($filename, $csv) { 

    header('Content-Disposition: attachment; filename="'.$filename.'"');
    header('Content-Type: csv/plain'); # Don't use application/force-download - it's not a real MIME type, and the Content-Disposition header is sufficient
    header('Content-Length: ' . strlen($csv));
    header('Connection: close');

    print($csv);

}