Отправка сообщений с приложениями (attach)

  $from = to_str($_POST['from_email']);
  $to = to_str($GLOBALS['LA']['to_email']);
  $subj = 'Заголовок';
  $text = 'Текст';

  $fa = new File();

    $un        = strtoupper(uniqid(time()));
    $head      = "From: $from\n";
    $head     .= "To: $to\n";
    $head     .= "Subject: $subj\n";
    $head     .= "X-Mailer: PHPMail Tool\n";
    $head     .= "Reply-To: $from\n";
    $head     .= "Mime-Version: 1.0\n";
    $head     .= "Content-Type:multipart/mixed;";
    $head     .= "boundary=\"----------".$un."\"\n\n";
    $zag       = "------------".$un."\nContent-Type:text/html;\n";
    $zag      .= "Content-Transfer-Encoding: 8bit\n\n$text\n\n";
    $zag      .= "------------".$un."\n";
    $zag      .= "Content-Type: application/octet-stream;";
    $zag      .= "name=\"".$_FILES['etc']['name']."\"\n";
    $zag      .= "Content-Transfer-Encoding:base64\n";
    $zag      .= "Content-Disposition:attachment;";
    $zag      .= "filename=\"".$_FILES['etc']['name']."\"\n\n";
    $zag      .= chunk_split(base64_encode($fa->GetFileContent( $_FILES['etc']['tmp_name'] )))."\n";

  mail("$to", "$subj", $zag, $head);