php - firefox cannot download csv file

Question

I'm trying to generate and then by default download csv file using php script. I have code which is working fine in chrome and internet explorer but the same script does not works in firefox. In firefox script does not generating csv file properly. Following are the script

require('core.php');
$master = new db();
$s = $master->getRecords();
function array2csv(array &$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) {

     // 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();

HTML and JS

<a class="list-group-item" href="javascript:void(0);" onclick="return exportUser();">Export to CSV</a> 

function exportUser(){ 
        $.ajax({
        url: 'get_csv.php',
        type: 'POST',
        success: function() {
            window.location = 'get_csv.php';
        }
    });
}

I also attached a screenshot for understanding.

Answer 1

Try adding this header:

header('Content-Type: application/csv; charset=utf-8');