query("SELECT id, created_at, updated_at FROM articles ORDER BY id DESC");
$articles = $stmt->fetchAll(PDO::FETCH_ASSOC);
$xml = '' . "\n";
$xml .= '' . "\n";
// 首页
$xml .= " \n";
$xml .= " {$domain}/\n";
$xml .= " " . date('Y-m-d') . "\n";
$xml .= " daily\n";
$xml .= " 1.0\n";
$xml .= " \n";
// 所有文章页
foreach ($articles as $article) {
$mod_time = !empty($article['updated_at']) ? $article['updated_at'] : $article['created_at'];
$mod_time = date('Y-m-d', strtotime($mod_time));
$xml .= " \n";
$xml .= " {$domain}/article.php?id={$article['id']}\n";
$xml .= " {$mod_time}\n";
$xml .= " weekly\n";
$xml .= " 0.8\n";
$xml .= " \n";
}
$xml .= '';
// 写入 sitemap.xml
file_put_contents(__DIR__ . '/sitemap.xml', $xml);
echo "✅ sitemap.xml 已生成，共 " . count($articles) . " 篇文章。";
echo "
访问 {$domain}/sitemap.xml 查看。";