<?php
$xml = '<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">';


foreach ($data->sitemap['main'] as $page)
{
    $xml .= "<url>
                    <loc>" . $data->link . $page['url'] . "</loc>
                    <changefreq>monthly</changefreq>
                    <priority>" . $page['priority'] . "</priority>
              </url>";

    if($page['name'] == 'blog')
    {
        foreach ($data->blog as $article)
        {
            $xml .= "<url>
                                                        <loc>" . $data->link ."/". $article->route . "</loc>
                                                        <changefreq>monthly</changefreq>
                                                        <priority>0.4</priority>
                                                    </url>";
        }
    }


    if($page['name'] == 'sporten' || $page['name'] == 'contact' || $page['name'] == 'over ons')
    {

        foreach ($data->sitemap[$page['name']] as $subpage)
        {
            $xml .= "<url>
                        <loc>" . $data->link . $subpage['url'] . "</loc>
                        <changefreq>monthly</changefreq>
                        <priority>" . $subpage['priority'] . "</priority>
                    </url>";


            if($subpage['name'] == 'groepslessen')
            {
                foreach ($data->groepslessen as $grouplesson)
                {
                    $xml .= "<url>
                                                    <loc>" . $data->link ."/". $grouplesson->route . "</loc>
                                                    <changefreq>monthly</changefreq>
                                                    <priority>0.4</priority>
                                                </url>";
                }
            }
        }

    }
}
$xml .= '</urlset>';
$xmlData = simplexml_load_string($xml);

echo $xmlData->asXML();