Help with adding string to generated xml file

1

Hello, basically i have a code to generate an xml playlist once the name and url of the song is submitted in my php form. However in order to link it to a flash mp3 player i need certain strings to be added to the code.

Here it is

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Adding Songs...</title>
<style type="text/css">
em {
    text-align:center;
}
</style>
</head>
<body>
<p>
<?
$songs = Array();
function start_element($parser, $name, $attrs){
    global $songs;
    if($name == "song"){
        array_push($songs, $attrs);
    }
}
function end_element ($parser, $name){}
$playlist_string = file_get_contents("playlist.xml");
$parser = xml_parser_create();
xml_set_element_handler($parser, "start_element", "end_element");
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
xml_parse($parser, $playlist_string) or die("Error parsing XML document.");
print "<br />";
if($_POST['action'] == "ins"){
    array_push($songs, Array(
                "title" => $_POST['name'],
                "artist" => $_POST['artist'],
                "path" => $_POST['path']));
    $songs_final = $songs;
}else if($_POST['action'] == "del"){
    $songs_final = Array();
    foreach($songs as $song){
        if($song['title'] != $_POST['name']){
            array_push($songs_final, $song);
        }
    }
}
$write_string = "<songs>";
foreach($songs_final as $song){
    $write_string .= "<song title=\"$song[title]\" artist=\"$song[artist]\" path=\"$song[path]\" />";
}
$write_string .= "</songs>";
$fp = fopen("playlist.xml", "w+");
fwrite($fp, $write_string) or die("Error writing to file");
fclose($fp);
print "<em>Song inserted or deleted successfully :)</em><br />";
print "<a href=\"index.php\" title=\"return\">Return</a>";
?>
</p>
</body>
</html>

what i want my code to generate is a xml playlist that has these tags

 			 				<playlist version="1">
<trackList>
<track>
<title></title>
    <location></location>
</track>
</trackList>
</playlist>

Please help me all i am able to do is simply change the song tag to track.

Thank You