PHP mail attach

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$f=$pdf->Output("bill/".$order_id."-schet.pdf",'S');

$subj="[К ОПЛАТЕ] Счет № $schet_num от $schet_date г. от $postavshik";



$filename  = "bill/".$order_id."-schet.pdf";

$text="счет на оплату";

$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;"; 

    $zag      .= "name=\"".basename($filename)."\"\n"; 

    $zag      .= "Content-Transfer-Encoding:base64\n"; 

    $zag      .= "Content-Disposition:attachment;"; 

    $zag      .= "filename=\"".basename($filename)."\"\n\n"; 

$zag	  .= chunk_split(base64_encode($f)); 



mail("XXX", "$subj", "$text", $zag, $head);