PhP not exporting XML in a proper format - php

Question

Not sure if this is causing my problem but I am trying to setup a rss campaign with Mailchimp. I have several of them setup which work fine.
This time I am trying to create another rss driven campaign, but I am creating the feed myself to get data out of mysql. The only thing is that the XML is exported as plain text and not formatting properly as an xml documnent.
My php code
<?php
header("Content-Type: application/rss+xml; charset=ISO-8859-1");
DEFINE ('DB_USER', '********');
DEFINE ('DB_PASSWORD', '*********');
DEFINE ('DB_HOST', '*******************************');
DEFINE ('DB_NAME', '******************************');
$rssfeed = '<?xml version="1.0" encoding="UTF-8"?>';
$rssfeed .= '<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:sy="http://purl.org/rss/1.0/modules/syndication/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" version="2.0">';
$rssfeed .= '<channel>';
$rssfeed .= '<title>Free Scrabble Dictionary - Word Of The Day</title>';
$rssfeed .= '<link>http://www.freescrabbledictionary.com</link>';
$rssfeed .= '<description>This is an example RSS feed</description>';
$rssfeed .= '<language>en-us</language>';
$rssfeed .= '<copyright>Copyright (C) '.date(Y).' freescrabbledictionary.com</copyright>';
$connection = #mysql_connect(DB_HOST, DB_USER, DB_PASSWORD)
or die('Could not connect to database');
mysql_select_db(DB_NAME)
or die ('Could not select database');
$query = "SELECT * FROM wordday LEFT JOIN wn_synset ON wordday.synset_id = wn_synset.synset_id LEFT JOIN wn_gloss ON wordday.synset_id = wn_gloss.synset_id ORDER BY wordoftheday.ID DESC LIMIT 1";
$result = mysql_query($query) or die ("Could not execute query");
while($row = mysql_fetch_array($result)) {
extract($row);
if ($ss_type == 'n') {
$ss_type = 'Noun';
} elseif ($ss_type == 'v') {
$ss_type == 'Verb';
}
$rssfeed .= '<item>';
$rssfeed .= '<title>'.$word.' - ['.$ss_type.']</title>';
$rssfeed .= '<description>'.$gloss.'</description>';
$rssfeed .= '<link>http://www.freescrabbledictionary.com/dictionary/word/test/</link>';
$rssfeed .= '<pubDate>' . date("D, d M Y H:i:s O", time()) . '</pubDate>';
$rssfeed .= '</item>';
}
$rssfeed .= '</channel>';
$rssfeed .= '</rss>';
echo $rssfeed;
?>
You can see my export at http://www.freescrabbledictionary.com/includes/wordoftheday.php
The php script is producing the correct data I need, but when I run a test email from Mailchimp the fields for pulling the title, description and link are showing as blank. In my mailchimp campaign I am listing the fields as
*|RSSFEED:TITLE|*
*|RSSFEED:DESCRIPTION|*
*|RSSFEED:LINK|*
Can I get my XML to format properly with a .php extension?
Any mailchimp experts out there? :)
Thanks you rock!