use Kalwa\KalwaParser;
use Kalwa\KalwaParser\Exceptions\SitemapParserException;

 try {
            $parser = new KalwaParser('MyCustomUserAgent');
            $parser->parse('https://themeselection.com/sitemap_index.xml');

            foreach ($parser->getSitemaps() as $url => $tags) {
             
                echo 'URL: ' . $url . '<br>';
             
                echo '<hr>';
            }
            foreach ($parser->getURLs() as $url => $tags) {
                echo $url . '<br>';  
            }
        } catch (SitemapParserException $e) {
            echo $e->getMessage();
        }

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