<?php

echo '<'.'?xml version="1.0" encoding="utf-8"?'.'>';

?>

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">

    <?php foreach ($results as $result) { ?>

    <url>

        <loc><?php echo $result['url']; ?></loc>

        <?php if (isset($result['date'])) { ?>

        <lastmod><?php 

		$datetime = new DateTime($result['date']);

		echo $datetime->format('Y-m-d\TH:i:sP'); ?></lastmod>

        <?php } else { ?>

        <lastmod><?php $datetime = new DateTime(date('Y-m-d'));

		echo $datetime->format('Y-m-d\TH:i:sP');

		?></lastmod>

        <?php } ?>

        <changefreq>weekly</changefreq>

        <?php if (isset($result['prior'])) { ?>

        <priority><?php echo $result['prior']; ?></priority>

        <?php } else { ?>

        <priority>0.5</priority>

        <?php } ?>

        <?php if (isset($result['img'])) { ?>

        <image:image>

            <image:loc><?php echo $result['img']; ?></image:loc>

            <image:caption><?php echo $result['name']; ?></image:caption>

            <image:title><?php echo $result['name']; ?></image:title>

        </image:image>

        <?php } ?>

    </url>

    <?php } ?>

</urlset>

1.) If you've have activated in "php.ini" the short_open_tag you'll get a php error. 

If you want to use PHP in combination with XML, you can disable this option in order to use inline. Otherwise, you can print it with PHP, for example: '; ?>.