how to create sitemap in php code example

Example: sitemap for php website

<?php 
header("Content-type: text/xml");
echo '<?xml version="1.0" encoding="UTF-8" ?>';
include 'includes/connectdb.php';
?>

<urlset xmlns="http://www.google.com/schemas/sitemap/0.84" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.google.com/schemas/sitemap/0.84 http://www.google.com/schemas/sitemap/0.84/sitemap.xsd">

    <url>
        <loc>http://www.DOMAIN.co.uk/</loc>
        <priority>1.00</priority>
    </url>

    <?php

    $sql = "SELECT * FROM pages WHERE onshow = 1 ORDER BY id ASC";
    $result = mysql_query($sql,$conn);      
    while($row = mysql_fetch_array($result))
    { 
    $filename = stripslashes($row['filename']);
    ?>
    <url>
        <loc>http://www.<?php echo "$domain"; ?>/<?php echo "$filename" ?></loc>
        <changefreq>monthly</changefreq>
        <priority>0.5</priority>
    </url>

 <?php } ?>

</urlset>