<?phpfunction send_download($data, $filename){  header("HTTP/1.1 200 OK");  header("Content-Type: application/force-download; charset=windows-1251");  header('Expires: ' . gmdate('D, d M Y H:i:s') . ' GMT');  $ua = (isset($_SERVER['HTTP_USER_AGENT']))?$_SERVER['HTTP_USER_AGENT']:'';  $isMSIE = preg_match('@MSIE ([0-9].[0-9]{1,2})@', $ua);  if ($isMSIE)   {      header('Content-Disposition: attachment; filename="' . $filename . '"');        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');      header('Pragma: public');  }   else   {      header('Content-Disposition: attachment; filename="' . $filename . '"');      header('Pragma: no-cache');  }  echo $data;}?>