Sending mail with pdf attachment using php

This website provide code "User Sending mail with pdf/doc file with mail function"
<?php  
$fileatt = "/home/palaceon/public_html/pdf/pow.pdf"; //Local  Path to the file plz find document root                  
$fileatt_type = "application/pdf"; // File Type  
$fileatt_name = "pow.pdf"; // Filename that will be used for the file as the attachment  
$email_from = "abc@gmail.com"; // Who the email is from  
$email_subject = "Your attached file"; // The Subject of the email  
$email_message = "Thanks for visiting mysite.com!  Here is your free file.<br>";
$email_message .= "Thanks for visiting.<br>"; // Message that the email has in it  
$email_to = "vikash_vikku25@gmail.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 "<font face=verdana size=2><center>You file has been sent<br> to the email address you specified.<br> 
Make sure to check your junk mail!<br>
Click <a href=\"#\" onclick=\"history.back();\">here</a> to return to http://web-tipsandtricks.blogspot.com/.</center>";
} else {  
die("Sorry but the email could not be sent. Please go back and try again!");  
}  
?>