อยากทราบวิธีการเขียน Rss Feed พร้อมเช็คว่าผู้ใช้งานได้อ่านข่าวไหนไปบ้างแล้ว

<?
mysql_connect("localhost", "root", "root") or die (mysql_error());
$dbname = "newsextraction"; 
$strSQL = "SELECT * FROM news_member WHERE member_id = '".$_SESSION['member_id']."'  ";
$objQuery = mysql_db_query($dbname,$strSQL);
$objResult = mysql_fetch_array($objQuery);
if (!$objResult){
echo "No";
}
else {
	$_SESSION["member_id"] = $objResult["member_id"];
$sql = "SELECT a.news_id as aid, b.date as bdate, a.org  , a.act , a.title , a.per , a.loc, b.url from news_su  a, news_web b where a.url_id=b.url_id 
AND a.type_id=1 by ";

$charset = "SET NAMES 'utf8'";
mysql_query($charset);
$query = mysql_db_query($dbname,$sql);

$data = '<?xml version="1.0" encoding="UTF-8"?>'."\n";
$data .= '<rss version="2.0">'."\n";
$data .= '<channel>'."\n";
$data .= '<title>New</title>'."\n";
$data .= '<description>Rss XML</description>'."\n";
$data .= '<link></link>'."\n";
$data .= '<pubDate>'.date("D, d M Y H:i:s O").'</pubDate>'."\n";

while($result = mysql_fetch_array($query)) {
$data .= '<item>'."\n";
$data .= '<description>'.$result[org].''.$result[act].''.$result[title].''.$result[per].''.$result[loc].'</description>'."\n"; 
//$data .= '<link>'.$result[url].'</link>'."\n"; 
$data .= '<date>'.$result[bdate].'</date>'."\n"; 
$data .= '<link>'.$result[url].'</link>'."\n"; 
$data .= '</item>'."\n";
}
}
//$url = "localhost/login1.php";
$data .= '</channel>'."\n";
$data .= '</rss>'."\n";

$f = fopen( 'rss.xml' , 'w' ); //ส่วนของการสร้างไฟล์ XML
fputs( $f , $data );
fclose( $f );
?>