how to write xml code in php code

<?php
header('Content-Type: text/xml');
echo "<?xml version = \"1.0\" encoding = \"utf-8\" ?>\n";
?>

<rss>
    <channel>
        <title> My Simple Blog</title>
        <link> http://localhost:1234/simple_blog/ </link>
        <desctiption> This blog is awesome. </desctiption>
        <language> en-us </language>
    </channel>
</rss>

This XML file does not appear to have any style information associated with it. The document tree is shown below.