how to send email with attachment file php

<?php
$fileatt = "ptkt.docx"; // Path to the file
$fileatt_type = "application/docx"; // File Type
$fileatt_name = "ptkt.docx"; // Filename that will be used for the file as the attachment

$email_from = "bikash@nayak.com"; // Who the email is from
$email_subject = "Your attached file"; // The Subject of the email
$email_message = "Thanks for bikash my blog http://phptechnicalgroups.blogspot.in.
";
$email_message .= "Thanks for bikash.
"; // Message that the email has in it

$email_to = 'bikash@techwave.com'; // Who the email is to

$headers = "From: ".$email_from;

$file = fopen($fileatt,'rb');
$data = fread($file,filesize($fileatt));
fclose($file);

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

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

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

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

$email_message .= "--{$mime_boundary}\n" .
"Content-Type: {$fileatt_type};\n" .
" name=\"{$fileatt_name}\"\n" .
//"Content-Disposition: attachment;\n" .
//" filename=\"{$fileatt_name}\"\n" .
"Content-Transfer-Encoding: base64\n\n" .
$data .= "\n\n" .
"--{$mime_boundary}--\n";

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

if($ok) {
echo "you mail has sent with attchment";

} else {
die("smtp not connecting");
}
?>