dynamicke sitemap

<?php
header("Content-Type: application/xml; charset=utf-8");
echo '<?xml version="1.0" encoding="UTF-8"?>'.PHP_EOL;
echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">' .PHP_EOL;
function sitemap($address)
{
    function urlElement($url)
    {
        echo '<url>' . PHP_EOL;
        echo '<loc>' . $url . '</loc>' . PHP_EOL;
        echo '<changefreq>weekly</changefreq>' . PHP_EOL;
        echo '<priority>1.00</priority>' . PHP_EOL;
        echo '</url>' . PHP_EOL;
    }

    function ampReplace($string)
    {
        $complete = str_replace('&', '&amp;', $string);
        return $complete;
    }

    function getUrl($address)
    {
        $html = file_get_contents($address);

        $dom = new DOMDocument();
        @$dom->loadHTML($html);

        $xpath = new DOMXPath($dom);
        $hrefs = $xpath->evaluate("/html/body//a");

        for ($i = 0; $i < $hrefs->length; $i++) {
            $href = $hrefs->item($i);
            $url = $href->getAttribute('href');
            $url = ampReplace($url);
            echo urlElement($address . $url);
        }
    }
    return getUrl($address);
}
sitemap('http://example.com');
echo '</urlset>';
?>