/* ===== SEO 基础设施：canonical + meta description + Organization Schema ===== */
add_action('wp_head', function () {
    global $wp;
    $url = home_url($wp->request);
    $title = wp_get_document_title();
    $desc = '';
    if (is_front_page()) {
        $desc = get_bloginfo('description') ?: get_bloginfo('name') . ' - ' . get_bloginfo('description');
    } elseif (is_singular()) {
        $desc = get_the_excerpt();
    } elseif (is_archive()) {
        $desc = get_the_archive_description();
    }
    if (is_singular()) {
        $pid = get_queried_object_id();
        $custom = get_post_meta($pid, '_leijex_page_lead', true);
        if ($custom) $desc = $custom;
        $yoast = get_post_meta($pid, '_yoast_wpseo_metadesc', true);
        $aio = get_post_meta($pid, '_aioseo_description', true);
        if ($aio) $desc = $aio;
        if ($yoast) $desc = $yoast;
    }

    /* canonical */
    $canon = $url;
    if (is_singular()) {
        $canon = get_permalink();
    }
    echo '<link rel="canonical" href="' . esc_url($canon) . '" />' . "\n";

    /* meta description fallback */
    if ($desc && strpos($html_buffer ?? '', 'name="description"') === false) {
        echo '<meta name="description" content="' . esc_attr(mb_substr($desc, 0, 160)) . '" />' . "\n";
    }

    /* Organization + WebSite Schema（仅首页） */
    if (is_front_page()) {
        $org = array(
            '@context' => 'https://schema.org',
            '@type' => 'Organization',
            'name' => get_bloginfo('name'),
            'url' => home_url('/'),
        );
        $logo = get_theme_mod('custom_logo');
        if ($logo) {
            $logo_data = wp_get_attachment_image_src($logo, 'full');
            if ($logo_data) $org['logo'] = $logo_data[0];
        }
        echo '<script type="application/ld+json">' . wp_json_encode($org, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
        $web = array(
            '@context' => 'https://schema.org',
            '@type' => 'WebSite',
            'name' => get_bloginfo('name'),
            'url' => home_url('/'),
        );
        echo '<script type="application/ld+json">' . wp_json_encode($web, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
    }

    /* BreadcrumbList Schema（非首页） */
    if (!is_front_page() && function_exists('leijex_breadcrumb')) {
        // 简化 BreadcrumbList
        $items = array();
        $items[] = array('@type' => 'ListItem', 'position' => 1, 'name' => 'Home', 'item' => home_url('/'));
        if (is_singular('product')) {
            $items[] = array('@type' => 'ListItem', 'position' => 2, 'name' => 'Products', 'item' => home_url('/products/'));
            $items[] = array('@type' => 'ListItem', 'position' => 3, 'name' => get_the_title());
        } elseif (!is_front_page()) {
            $items[] = array('@type' => 'ListItem', 'position' => 2, 'name' => get_the_title());
        }
        if (count($items) > 1) {
            $bl = array('@context' => 'https://schema.org', '@type' => 'BreadcrumbList', 'itemListElement' => $items);
            echo '<script type="application/ld+json">' . wp_json_encode($bl, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) . '</script>' . "\n";
        }
    }
}, 2);<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /usr/share/nginx/html/leijex-wp/wp-content/themes/leijex/inc/seo-base.php:1) in <b>/usr/share/nginx/html/leijex-wp/wp-content/plugins/all-in-one-seo-pack/app/Common/Sitemap/Sitemap.php</b> on line <b>405</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /usr/share/nginx/html/leijex-wp/wp-content/themes/leijex/inc/seo-base.php:1) in <b>/usr/share/nginx/html/leijex-wp/wp-content/plugins/all-in-one-seo-pack/app/Common/Sitemap/Sitemap.php</b> on line <b>406</b><br />
<?xml version="1.0" encoding="UTF-8"?>
<!-- This sitemap was 动态地 generated on 2026年10月02日 at 12:34 上午 by All in One SEO v4.7.7 - the original SEO plugin for WordPress. -->

<?xml-stylesheet type="text/xsl" href="https://www.leijex.com/default-sitemap.xsl?sitemap=root"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/post-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-24T00:55:52+00:00]]></lastmod>
	</sitemap>
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/page-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-29T08:20:03+00:00]]></lastmod>
	</sitemap>
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/product-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-09T23:05:40+00:00]]></lastmod>
	</sitemap>
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/post-archive-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-09T23:05:40+00:00]]></lastmod>
	</sitemap>
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/category-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-26T01:21:33+00:00]]></lastmod>
	</sitemap>
	<sitemap>
		<loc><![CDATA[https://www.leijex.com/brand-sitemap.xml]]></loc>
		<lastmod><![CDATA[2026-09-09T23:05:40+00:00]]></lastmod>
	</sitemap>
</sitemapindex>