Txt file mail attachment

Hello,

I need to attach multiple txt files in a mail, this is not the problem.
The problem is that I'm loading the content out of MySQL and saving these txt files will be waste of time.
How can I attach multiple txt files with content loaded out of MySQL without being a txt file? So it's 'on the fly'.

Thanks in advance,
Michael

EDIT: I've this so far:

$to = urldecode($_GET['to']);
$boundary = '-----=' . md5( uniqid ( rand() ) );
$query = mysql_query("SELECT * FROM `task` WHERE `pid` = '$id'") or die(mysql_error());
while($r = mysql_fetch_array($query)){
	$content = $r['title']."
			
	".$r['content'];
	$content_encode = chunk_split(base64_encode($content));
	$r['title'] = preg_replace("/ /i", "_", $r['title']);
	$message .= "Content-Type: text/plain; name=\"{$r['title']}.txt\"\n";
	$message .= "Content-Transfer-Encoding: base64\n";
	$message .= "Content-Disposition: attachment\n";
	$message .= $content_encode . "\n";
	$message .= "--" . $boundary . "\n";
}
$headers  = "From: xxx@xxx.com\n";
$headers .= "MIME-Version: 1.0\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"$boundary\"";
mail($to, 'Test', $message, $headers);

Code (markup):

But it only shows "ATT00001" in the attachments list and has no content, what am I doing wrong?