blog/sitemap.php

<?php
/**
  urlset structure
  url:
    loc: fully qualified url of page
    lastmod: date of last change to page
      - W3C DATETIME format (http://www.w3.org/TR/NOTE-datetime).
      - Example: 2005-05-10, or 2005-05-10T17:33:30+08:00
    changefreq: optional, one of
      - always, hourly, daily, weekly, monthly, yearly, never
      - value "always" should be used to describe documents that change each
        time they are accessed. The value "never" should be used to describe
         archived URLs.
    priority: optional, relative to other pages, from 0.0 to 1.0
*/
header('Content-Type: text/xml; charset=utf-8');
$stylesheet_url = $config['SITEMAP_STYLESHEET'] ?? '/sitemap/sitemap.xsl';

# Server Settings. Will select defaults for CLI usage
$document_root = $_SERVER['DOCUMENT_ROOT'] ?: realpath(__DIR__.'/..');
$scheme = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
$host = $_SERVER['SERVER_NAME'] ?? 'localhost';
$base_url = $scheme . '://' . $host;

# Check for stylesheet before emitting xsl record
if (file_exists($document_root.$stylesheet_url)) {
   $stylesheet = "<?xml-stylesheet type=\"text/xsl\" href=\"$stylesheet_url\"?" . ">\n";
} else {
   error_log(__FILE__ . "$name cannot be found in $document_root");
}

# Find relative folder and scan for docs
$article_path = str_replace($document_root, '', dirname(__FILE__));
$fileglob = glob('*.{php,md}',GLOB_BRACE);
?>
<?xml version="1.0" encoding="UTF-8"?>
<?= $stylesheet ?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:image="http://www.google.com/schemas/sitemap-image/1.1"
  xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd http://www.google.com/schemas/sitemap-image/1.1 http://www.google.com/schemas/sitemap-image/1.1/sitemap-image.xsd"
  xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<?php
 
foreach($fileglob as $file) {
   if ($file === 'index.php') continue;
   if ($file === 'sitemap.php') continue;
   if ($file === 'README.md') continue;
   
#   $page = file_get_contents($file);
#   $update = stat($file)->modified_date;
   $file = basename($file, '.php');
   $update = '2025-05-07';
?>
  <url>
    <loc><?= $base_url . $article_path . '/' . $file ?></loc>
    <lastmod><?= $update ?></lastmod>
  </url>
<?php  
} // end foreach
?>
</urlset>