// ФУНКЦИЯ СКАЧКИ ФАЙЛА

function file_download($filename, $mimetype='application/octet-stream') {
    if (file_exists($filename)) {
      header($_SERVER["SERVER_PROTOCOL"] . ' 200 OK');
      header('Content-Type: ' . $mimetype);
      header('Last-Modified: ' . gmdate('r', filemtime($filename)));
      header('ETag: ' . sprintf('%x-%x-%x', fileinode($filename), filesize($filename), filemtime($filename)));
      header('Content-Length: ' . (filesize($filename)));
      header('Connection: close');
      header('Content-Disposition: attachment; filename="' . basename($filename) . '";');
      $f=fopen($filename, 'r');
      while(!feof($f)) {

        echo fread($f, 1024);
        flush();
      }
      fclose($f);
    } else {
      header($_SERVER["SERVER_PROTOCOL"] . ' 404 Not Found');
      header('Status: 404 Not Found');
    }
    exit;
}

// КОНЕЦ ФУНКЦИИ СКАЧКИ ФАЙЛА