PHP を使用して CMS でサイト マップ管理モジュールを開発する方法

require_once (ABSPATH . 'wp-admin/includes/admin.php');
require_once (ABSPATH . 'wp-includes/post.php');

function generate_xml_file() { 
   $postsForSitemap = get_posts(array( 
       'numberposts' => -1, 
       'orderby' => 'modified', 
       'post_type' => array('post', 'page'), 
       'order' => 'DESC' 
   )); 
   $sitemap = '<?xml version="1.0" encoding="UTF-8"?>' . "
" . '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . "
"; 
   foreach($postsForSitemap as $post) { 
       setup_postdata($post); 
       $postdate = explode(" ", $post->post_modified); 
       $sitemap .= "    " . '<url>' . "
" . 
           "        " . '<loc>' . get_permalink($post->ID) . '</loc>' . "
" . 
           "        " . '<lastmod>' . $postdate[0] . '</lastmod>' . "
" . 
           "        " . '<changefreq>weekly</changefreq>' . "
" . 
           "        " . '<priority>0.8</priority>' . "
" . 
           "    " . '</url>' . "
"; 
   } 
   $sitemap .= '</urlset>' . "
"; 
   $fp = fopen(ABSPATH . "sitemap.xml", 'w'); 
   fwrite($fp, $sitemap); 
   fclose($fp); 
}

function get_pages_for_sitemap() {
   $args = array(
       'post_type' => 'page',
       'post_status' => 'publish',
       'posts_per_page' => -1,
   );
   $pages = new WP_Query($args);
   return $pages;
}
 
function get_posts_for_sitemap() {
   $args = array(
       'post_type' => 'post',
       'post_status' => 'publish',
       'posts_per_page' => -1,
   );
   $posts = new WP_Query($args);
   return $posts;
}

add_action('wp_head', 'addSitemapXsl');
function addSitemapXsl() {
  echo '<?xml-stylesheet type="text/xsl" href="'.get_bloginfo('wpurl').'/tools/sitemap.xsl"?>';
}

add_action('init', 'disableYoastSitemap');
function disableYoastSitemap() {
  remove_action('pre_get_posts', array(YoastSEO_VendorSitemapController::class, 'sitemap_query'), 9999);
}