I am using the following code to send an email with an attachment, but the correct file is not attached to the message.

$UnidID = $_COOKIE['UniqueID'];
$guid = $_COOKIE['guid'];
$target_path = "userdata/".$UniqueID."/".$iGuid."/Outputs";
$fname = getpathmail($UnidID,$guid);
$target_path = $target_path.$filname;

$fileatt_type = "application/fbf"; // File Type
$fileatt_name = $fname; 
$data = $target_path;
$email_from = "EHPAdmin@fugro.in"; 
$email_subject = "EHP/PPP process";
$email_message = "Processed result for EHP/PPP processing";

$email_to = $_GET['Email'] ; 

$headers = "From: ".$email_from;

$semi_rand = md5(time());
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

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

$email_message .= "This is a multi-part message in MIME format.nn" .
"--{$mime_boundary}n" .
"Content-Type:text/html; charset="iso-8859-1"n" .
"Content-Transfer-Encoding: 7bitnn" .
$email_message .= "nn";

$data = chunk_split(base64_encode($data));

$email_message .= "--{$mime_boundary}n" .
"Content-Type: {$fileatt_type};n" .
" name="{$fileatt_name}"n" .
"Content-Transfer-Encoding: base64nn" .
$data .= "nn" .
"--{$mime_boundary}--n";

$ok = @mail($email_to, $email_subject, $email_message, $headers);