$fichier = 'file.csv';
 header( "Content-Type: text/csv;charset=utf-8" );
 header( "Content-Disposition: attachment;filename=\"$fichier\"" );
 header("Pragma: no-cache");
 header("Expires: 0");

 $fp= fopen('php://output', 'w');

 foreach ($list as $fields) 
 {
    fputcsv($fp, $fields);
 }
 fclose($fp);
 exit();