如何使用PHP和DOMDocument生成带有页面本地化版本的谷歌网站地图

<?php
$dom = new DOMDocument('1.0', 'UTF-8');

$urlset = $dom->createElementNS('http://www.sitemaps.org/schemas/sitemap/0.9', 'urlset');
$urlset->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
$urlset->setAttribute('xsi:schemaLocation', 'http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd');
$dom->appendChild($urlset);

$pages = array(
    'https://example.com/',
    'https://example.com/about',
    'https://example.com/contact'
);

foreach ($pages as $page) {
    $url = $dom->createElement('url');
    
    $loc = $dom->createElement('loc', $page);
    $url->appendChild($loc);
    
    $lastmod = $dom->createElement('lastmod', date('Y-m-d'));
    $url->appendChild($lastmod);
    
    $changefreq = $dom->createElement('changefreq', 'weekly');
    $url->appendChild($changefreq);
    
    $urlset->appendChild($url);
}

$dom->formatOutput = true;
$dom->save('sitemap.xml');