hantico/wp-content/themes/hantico/inc/schema.php

<?php

function hantico_schema_is_blog() {
	return is_page('blog') || is_page_template('templates/template-blog.php');
}

function hantico_schema_enabled() {
	return !is_404() && !is_preview() && !is_feed()
		&& (hantico_schema_is_blog() || is_singular('article'));
}

// Общая выборка для HTML и JSON-LD. На странице сейчас выводится первая
// порция; дальнейшие порции загружаются AJAX, без отдельного URL пагинации.
function hantico_blog_query($featured = false) {
	static $queries = [];
	$key = $featured ? 'featured' : 'list';
	if (!isset($queries[$key])) {
		$category = !$featured && isset($_GET['category']) && is_string($_GET['category'])
			? sanitize_title(wp_unslash($_GET['category'])) : '';
		$queries[$key] = new WP_Query([
			'post_type' => 'article',
			'posts_per_page' => $featured ? 6 : 12,
			'orderby' => 'date',
			'order' => 'DESC',
			'tax_query' => hantico_blog_tax_query(hantico_blog_section(), $category),
		]);
	}
	return $queries[$key];
}

function hantico_schema_url() {
	if (is_singular('article')) {
		return get_permalink(get_queried_object_id());
	}
	$section = hantico_blog_section();
	$url = home_url(user_trailingslashit('/' . ($section && $section !== 'general' ? 'blog-' . $section : 'blog')));
	return $section === 'general' ? add_query_arg('section', 'general', $url) : $url;
}

function hantico_schema_text($text) {
	return trim(html_entity_decode(wp_strip_all_tags((string) $text), ENT_QUOTES | ENT_HTML5, 'UTF-8'));
}

function hantico_schema_section_name($section) {
	$term = $section ? get_term_by('slug', $section, 'article_chapter') : false;
	return $term && !is_wp_error($term) ? $term->name : get_the_title(get_queried_object_id());
}

// Yoast хранит прежний permalink в индексе: корректируем только вывод,
// не меняя настройки плагина или сохранённые SEO-поля.
add_filter('wpseo_canonical', function ($url) {
	return hantico_schema_enabled() ? hantico_schema_url() : $url;
});
add_filter('wpseo_opengraph_url', function ($url) {
	return hantico_schema_enabled() ? hantico_schema_url() : $url;
});

function hantico_schema_has_type($node, $types) {
	return (bool) array_intersect((array) ($node['@type'] ?? []), (array) $types);
}

function hantico_schema_graph($graph) {
	if (!hantico_schema_enabled()) {
		return $graph;
	}
	$url = hantico_schema_url();
	$post_id = get_queried_object_id();
	$is_blog = hantico_schema_is_blog();
	$page_index = null;
	// Обновляем также связанные ID изображений, крошек и действий Yoast.
	foreach ($graph as $node) {
		if (hantico_schema_has_type($node, ['WebPage', 'CollectionPage', 'ItemPage']) && !empty($node['url'])) {
			$old_url = $node['url'];
			array_walk_recursive($graph, function (&$value) use ($old_url, $url) {
				if (is_string($value) && ($value === $old_url || strpos($value, $old_url . '#') === 0)) {
					$value = $url . substr($value, strlen($old_url));
				}
			});
			break;
		}
	}
	$website_id = home_url('/#website');
	$organization_id = home_url('/#organization');
	$organization_found = false;
	foreach ($graph as $index => $node) {
		if (hantico_schema_has_type($node, ['WebPage', 'CollectionPage', 'ItemPage'])) {
			$page_index = $index;
		}
		if (hantico_schema_has_type($node, 'WebSite')) {
			$website_id = $node['@id'];
		}
		if (hantico_schema_has_type($node, 'Organization')) {
			$organization_id = $node['@id'];
			$organization_found = true;
		}
	}
	if (!$organization_found) {
		$graph[] = [
			'@type' => 'Organization', '@id' => $organization_id,
			'name' => 'Hantico', 'url' => home_url('/'),
			'logo' => ['@type' => 'ImageObject', 'url' => get_theme_file_uri('assets/img/icons/logo.svg')],
		];
	}
	$website_found = false;
	foreach ($graph as &$node) {
		if (hantico_schema_has_type($node, 'WebSite')) {
			$node['publisher'] = ['@id' => $organization_id];
			$website_found = true;
		}
	}
	unset($node);
	if (!$website_found) {
		$graph[] = ['@type' => 'WebSite', '@id' => $website_id, 'url' => home_url('/'),
			'name' => get_bloginfo('name'), 'publisher' => ['@id' => $organization_id]];
	}
	if ($page_index === null) {
		$graph[] = ['@type' => 'WebPage', '@id' => $url];
		$page_index = array_key_last($graph);
	}
	$page = &$graph[$page_index];
	$page['url'] = $url;
	$page['isPartOf'] = ['@id' => $website_id];
	$page['inLanguage'] = get_bloginfo('language');
	$page['breadcrumb'] = ['@id' => $url . '#breadcrumb'];
	$description = $page['description'] ?? '';
	if ($is_blog) {
		$section = hantico_blog_section();
		$page['@type'] = 'CollectionPage';
		$page['name'] = hantico_schema_text($section ? hantico_schema_section_name($section) : (get_field('blog_title', $post_id) ?: get_the_title($post_id)));
		$term = $section ? get_term_by('slug', $section, 'article_chapter') : false;
		$description = $term && !is_wp_error($term) && $term->description
			? $term->description : ($description ?: get_field('blog_descr', $post_id));
		// Два списка соответствуют двум реальным блокам, без повторных запросов
		// и без включения статей из следующих AJAX-порций.
		$page['mainEntity'] = [];
		foreach ([true, false] as $featured) {
			$list_id = $url . ($featured ? '#featured-articles' : '#articles');
			$items = [];
			foreach (hantico_blog_query($featured)->posts as $post) {
				$items[] = ['@type' => 'ListItem', 'position' => count($items) + 1,
					'url' => get_permalink($post), 'name' => hantico_schema_text(get_the_title($post))];
			}
			$graph[] = ['@type' => 'ItemList', '@id' => $list_id,
				'numberOfItems' => count($items), 'itemListElement' => $items];
			$page['mainEntity'][] = ['@id' => $list_id];
		}
		$crumbs = [['name' => 'Главная', 'item' => home_url('/')], ['name' => $page['name'], 'item' => $url]];
	} else {
		$description = $description ?: (get_field('brief_description', $post_id) ?: get_field('article_descr', $post_id));
		$article = [
			'@type' => 'Article', '@id' => $url . '#article', 'url' => $url,
			'headline' => hantico_schema_text(get_the_title($post_id)),
			'datePublished' => get_post_time('c', true, $post_id),
			'dateModified' => get_post_modified_time('c', true, $post_id),
			'publisher' => ['@id' => $organization_id],
			'mainEntityOfPage' => ['@id' => $page['@id']],
			'inLanguage' => get_bloginfo('language'),
		];
		$image = get_the_post_thumbnail_url($post_id, 'full');
		if ($image) {
			$article['image'] = $image;
		}
		$article['author'] = [
			'@type' => 'Organization',
			'@id' => home_url('/about/#editorial'),
			'name' => 'Редакция Hantico',
			'url' => home_url('/about/'),
		];
		if ($description) {
			$article['description'] = hantico_schema_text($description);
		}
		$article_index = null;
		foreach ($graph as $index => $node) {
			if (hantico_schema_has_type($node, ['Article', 'BlogPosting', 'NewsArticle'])) {
				$article_index = $index;
				$article['@id'] = $node['@id'];
				break;
			}
		}
		if ($article_index === null) {
			$graph[] = $article;
		} else {
			$graph[$article_index] = array_merge($graph[$article_index], $article);
		}
		$page['mainEntity'] = ['@id' => $article['@id']];
		$base = hantico_article_url_base($post_id);
		$section = $base === 'blog' ? '' : substr($base, 5);
		$blog_page = get_page_by_path('blog');
		$crumbs = [
			['name' => 'Главная', 'item' => home_url('/')],
			['name' => $section ? hantico_schema_section_name($section) : ($blog_page ? get_the_title($blog_page) : 'Блог'),
				'item' => home_url(user_trailingslashit('/' . $base))],
			['name' => $article['headline'], 'item' => $url],
		];
	}
	if ($description) {
		$page['description'] = hantico_schema_text($description);
	}
	unset($page);
	$breadcrumb = ['@type' => 'BreadcrumbList', '@id' => $url . '#breadcrumb', 'itemListElement' => []];
	foreach ($crumbs as $crumb) {
		$breadcrumb['itemListElement'][] = array_merge(['@type' => 'ListItem', 'position' => count($breadcrumb['itemListElement']) + 1], $crumb);
	}
	$breadcrumb_index = null;
	foreach ($graph as $index => $node) {
		if (hantico_schema_has_type($node, 'BreadcrumbList')) {
			$breadcrumb_index = $index;
			break;
		}
	}
	if ($breadcrumb_index === null) {
		$graph[] = $breadcrumb;
	} else {
		$graph[$breadcrumb_index] = $breadcrumb;
	}
	return $graph;
}

// Yoast выводит граф в wp_head и безопасно кодирует JSON самостоятельно.
add_filter('wpseo_schema_graph', 'hantico_schema_graph', 20);

// Резервный вывод, если Yoast деактивирован. При активном плагине второй
// script не создаётся, даже если его разметка отключена настройкой.
add_action('wp_head', function () {
	if (defined('WPSEO_VERSION') || !hantico_schema_enabled()) {
		return;
	}
	$json = wp_json_encode(['@context' => 'https://schema.org', '@graph' => hantico_schema_graph([])],
		JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_UNESCAPED_UNICODE);
	if ($json) {
		echo '<script type="application/ld+json">' . $json . '</script>' . "\n";
	}
}, 30);