redundant_prefix, '', $header['description']);
// 描述优先保留当前页面自己的内容，只有为空时才回退到站点默认描述
$site_default_desc = strip_tags($default_header['description']);
$current_desc_stripped = strip_tags($header['description']);
$header['description'] = empty($current_desc_stripped) ? $site_default_desc : $current_desc_stripped;
// 强制同步 og:description，解决内容不一致问题
$header['og_description'] = $header['description'];
// 为帖子页切换更准确的 Open Graph 类型
if (preg_match('/\/thread-\d+(-\d+)?\.htm/', $current_path)) {
$header['og_type'] = 'article';
}
// 低价值页与参数页使用 noindex,follow，避免消耗收录预算
$should_noindex = false;
if (
preg_match('/^\/search\.htm$/', $current_path) ||
preg_match('/^\/user\-(login|create|resetpw|resetpw_complete)\.htm$/', $current_path) ||
strpos($current_path, '/my-') === 0 ||
preg_match('/^\/thread-create(\-\d+)?\.htm$/', $current_path) ||
preg_match('/^\/post-update-\d+\.htm$/', $current_path) ||
preg_match('/^\/post-create-\d+-\d+(\-\d+)?\.htm$/', $current_path)
) {
$should_noindex = true;
}
if (strpos($current_path, '/domain-market') === 0 && !empty($current_query)) {
$should_noindex = true;
}
if ($should_noindex) {
$header['robots'] = 'noindex,follow';
}
// 输出 meta 标签
echo "\t" . '' . "\n";
echo "\t" . '' . "\n";
if (!empty($header['image'])) {
echo "\t" . '' . "\n";
}
if (!empty($header['robots'])) {
echo "\t" . '' . "\n";
}
// 输出 Canonical 标签 (规范化链接)
$canonical_url = !empty($header['canonical_url']) ? $header['canonical_url'] : '';
if (empty($canonical_url)) {
$canonical_url = $canonical_base . $current_path;
}
$header['og_url'] = $canonical_url;
if ($canonical_url) {
echo "\t" . '' . "\n";
}
// 输出 JSON-LD 结构化数据 (面包屑导航)
if (!empty($header['breadcrumb'])) {
$json_ld = [
"@context" => "https://schema.org",
"@type" => "BreadcrumbList",
"itemListElement" => []
];
$position = 1;
foreach ($header['breadcrumb'] as $name => $url) {
$breadcrumb_item_url = (strpos($url, 'http') === 0) ? $url : $canonical_base . '/' . ltrim($url, '/');
$json_ld['itemListElement'][] = [
"@type" => "ListItem",
"position" => $position++,
"name" => strip_tags($name),
"item" => $breadcrumb_item_url
];
}
echo "\t" . '' . "\n";
}
?>