Using PHP to generate an XML file - php

Question

I currently have a PHP script which when ran outputs an XML file (however as feed.php not feed.xml) I have been told to add this to my .htaccess and it should fix it:
AddType application/x-httpd-php .xml
However for some reason that isn't working.
What I'd ideally like the script to do - when ran is to generate a feed.xml file with the output of its contents, rather than just outputting the contents on the php page.
Here is my code:
<?PHP
include("../config.php");
#// Timetable Clearup Variabls
$yesterday = strtotime('yesterday');
$yesterdow = date('l',$yesterday);
$order = "SELECT * FROM timetable WHERE day = '$yesterdow' ORDER BY time";
$result = mysql_query($order);
$yesterdayd = date('F jS, Y', time()-86400);
//SET XML HEADER
header('Content-type: text/xml');
//CONSTRUCT RSS FEED HEADERS
$output = '<rss version="2.0">';
$output .= '<channel>';
$output .= "<title>Timetable - {$yesterdayd} </title>";
$output .= '<description>Timetable.</description>';
$output .= '<link>http://site.com/</link>';
### $output .= '<copyright>Your copyright details</copyright>';
while ($row = mysql_fetch_array($result)) {
//BODY OF RSS FEED
$output .= '<item>';
$output .= "<description><td>" . htmlspecialchars($row['username']) . "</td><td>" . htmlspecialchars($row['time']) . "</td></description>";
$output .= '</item> ';
}
//CLOSE RSS FEED
$output .= '</channel>';
$output .= '</rss>';
//SEND COMPLETE RSS FEED TO BROWSER
echo($output);
?>

Answer 1

I would suggest not adding .xml in .htaccess to be processed using PHP compiler.
Rather use mod_rewrite to redirect requests to .xml files to php script.
For example:
RewriteEngine On
RewriteRule ^(.*)\.xml$ /rss_feed.php [L,QSA]