if(!empty($_FILES['attachment']))
  {
    foreach($_FILES['attachment']['tmp_name'] as $key => $tmp_name)
    {

      $start = explode(".", $_FILES['attachment']['name'][$key]);
      $ext = end($start);
      $new_filename = time()."_".rand(000000000,999999999).".".$ext;
      $save_path = "uploads/".$new_filename;
      move_uploaded_file($_FILES['attachment']['tmp_name'][$key], $save_path);
    }
  }