生成PDF并通过电子邮件作为附件发送（PDF未打开）

I am generating pdf and sent it through email as attachment the code is given below for this i skipped some code for generating pdf (not needed). Please check the code:

//pdf generated not given avobe code of how it comes 
$pdfdoc = $pdf->Output("confirmation-".$client_code.".pdf", "S");

$attachment = chunk_split(base64_encode($pdfdoc));

$to = $mail_to;       

$from        = "From: <info@ksilbd.com>";

$subject     = "Here is your attachment";

$mainMessage = "BUY/SALE CONFIRMATION";

$fileatt     = $attachment;

$fileatttype = "application/pdf";

$fileattname = "confirmation-".$client_code.".pdf"; 

$headers = "From: $from";

$file = fopen($fileatt, 'rb');

$data = fread($file, filesize($fileatt));

fclose($file);


$semi_rand     = md5(time());

$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

$headers      .= "
MIME-Version: 1.0
" .
"Content-Type: multipart/mixed;
" .
" boundary=\"{$mime_boundary}\"";

$message = "This is a multi-part message in MIME format.

" .
"-{$mime_boundary}
" .
"Content-Type: text/plain; charset=\"iso-8859-1
" .
"Content-Transfer-Encoding: 7bit

" .
$mainMessage  . "

";
//base_64 
//encoding used
//to encode data
$data = chunk_split(base64_encode($data));

//message
//concat the 
//message
$message .= "--{$mime_boundary}
" .
"Content-Type: {$fileatttype};
" .
" name=\"{$fileattname}\"
" .
"Content-Disposition: attachment;
" .
" filename=\"{$fileattname}\"
" .
"Content-Transfer-Encoding: base64

" .

$data . "

" .
"-{$mime_boundary}-
";

 // Send the email
if(mail($to, $subject, $message, $headers)) {
    echo "EMAIL SENT SUCCESSFUL.";
}
else {
    echo "There was an error sending the mail.";

The message showed email sent successful and i got email too but i failed to open the attached pdf file with the mail .... please check the problem

You may use "phpmailer". Download the PHPMailer script from here: http://github.com/PHPMailer/PHPMailer and Enjoy it.