Send two attachments in email, PHP - php

Question

Need your advice on how to make a mail with two attachments (one-time downloadable links) and send it using PHP.
For now, I have a code that sends only one link and it works fine. Actually how I've built my program is that I have two PHP files: url.php and get_file.php. In get_file.php I create a one-time downloadable URL to the document I want to send via email using url.php.
Here is a code of get_file.php:
<?php
/* Retrieve the given token: */
$token = $_GET['q'];
if( strlen($token)<32 )
{
die("Invalid token!");
}
/* Define the file for download: */
$secretfile = "file1.pdf";
/* This variable is used to determine if the token is valid or not: */
$valid = 0;
/* Define what file holds the ids. */
$file = "urls.txt";
/* Read the whole token-file into the variable $lines: */
$lines = file($file);
/* Truncate the token-file, and open it for writing: */
if( !($fd = fopen("urls.txt","w")) )
die("Could not open $file for writing!");
/* Aquire exclusive lock on $file. */
if( !(flock($fd,LOCK_EX)) )
die("Could not equire exclusive lock on $file!");
/* Loop through all tokens in the token-file: */
for( $i = 0; $i < count($lines); $i++ )
{
/* Is the current token the same as the one defined in $token? */
if( $token == rtrim($lines[$i]) )
{
$valid = 1;
}
/* The code below will only get executed if $token does NOT match the
current token in the token file. The result of this will be that
a valid token will not be written to the token file, and will
therefore only be valid once. */
else
{
fwrite($fd,$lines[$i]);
}
}
/* We're done writing to $file, so it's safe release the lock. */
if( !(flock($fd,LOCK_UN)) )
die("Could not release lock on $file!");
/* Save and close the token file: */
if( !(fclose($fd)) )
die("Could not close file pointer for $file!");
/* If there was a valid token in $token, output the secret file: */
if( $valid )
{
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($secretfile).'"';
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
/*header('Content-Length: ' . filesize($file));*/
readfile($secretfile);
}
else
{
print "Invalid URL!";
}
?>
Here is a code of url.php:
<?php
$token = md5(uniqid(rand(),1));
$file = "urls.txt";
if( !($fd = fopen($file,"a")) )
die("Could not open $file!");
if( !(flock($fd,LOCK_EX)) )
die("Could not aquire exclusive lock on $file!");
if( !(fwrite($fd,$token."\n")) )
die("Could not write to $file!");
if( !(flock($fd,LOCK_UN)) )
die("Could not release lock on $file!");
if( !(fclose($fd)) )
die("Could not close file pointer for $file!");
$cwd = substr($_SERVER['PHP_SELF'],0,strrpos($_SERVER['PHP_SELF'],"/"));
function clean_string($string) {
$bad = array("content-type","bcc:","to:","cc:","href");
return str_replace($bad,"",$string);
}
$a = "http://".$_SERVER['HTTP_HOST']."$cwd/get_file.php?q=$token";
$email_to = $_POST['email'];
$email_to_bcc = "mail#mail.com";
$email_from = "mail#mail.com";
$email_subject = "download link";
$email_message = "Thank you for your purchase.\n\n";
$comments = $a;
$email_message .= "Here is your one-time link to download the file:\n".clean_string($comments);
$headers = 'From: '.$email_from."\r\n" .
'BCC: '.$email_to_bcc."\r\n" .
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($email_to, $email_subject, $email_message, $headers);
?>
The question is whether in my get_file.php I can define two files for download, create two downloadable links and than create two attachments in the header?