Flyspray

current playground:

$outfile = sprintf('%s_%s.csv', preg_replace('/[^\d|\w]+/', '_', $proj->prefs['project_title']), date("Y-m-d"));

#$outfileutf8 = str_replace(' ', '_', utf8_decode($proj->prefs['project_title'])).'_'.date("Y-m-d").'.csv';
#$outfileascii = sprintf('%s_%s.csv', preg_replace('/[^\d*|^\w*]+/', '_', $proj->prefs['project_title']), date("Y-m-d"));
#if(function_exists('iconv')){
#       setlocale(LC_CTYPE, 'de_DE.utf8');
#       $outfileascii = sprintf( '%s_%s.csv', iconv('UTF-8', 'ASCII//TRANSLIT', $proj->prefs['project_title']), date("Y-m-d"));
#} else{
#       $outfileascii = sprintf( '%s_%s.csv', preg_replace('/[^\d*|^\w*]+/', '_', $proj->prefs['project_title']), date("Y-m-d"));
#}

#header('Content-Type: application/csv');
header('Content-Type: text/csv');
#header('Content-Disposition: attachment; filename="'.$outfileascii.'"; filename*=utf-8\'\''.$outfileutf8); # see RFC5987
header('Content-Disposition: attachment; filename="'.$outfile);
header('Content-Transfer-Encoding: binary');

Got this far:

• Without rfc5987 variant utf8 filenames for download works with firefox, but not IE Edge.
• With rfc5987 variant utf8 filenames for download works with IE Edge, but not Firefox nor Chrome...

rawurlencode() seems to be our friend ..

quick test works with IE Edge, Firefox, Chrome.