This code will add dynamic BreadcrumbList schema on WordPress websites. Please add the following script to the functions.php file inside the theme.
add_action('wp_footer','wp_schema_breadcrumbs');
function wp_schema_breadcrumbs() {
$post_id = get_option('page_for_posts');
$post = get_post($post_id);
$slug = $post->post_name;
$blog_posts_page_slug = '/'.$slug;
$site_name = get_bloginfo('blogname');
if (!is_search()) { ?>
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "BreadcrumbList",
"itemListElement":
[<?php if (is_singular('post')) { // if on a single blog post ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_site_url('url').$blog_posts_page_slug; ?>",
"name": "<?php echo $site_name; ?>"
}
},
{
"@type": "ListItem",
"position": 2,
"item":
{
"@id": "<?php echo get_permalink(); ?>",
"name": "<?php echo get_the_title(); ?>"
}
}
<?php } elseif (is_singular('product')) { // if on a single product page
global $post;
$terms = wp_get_object_terms($post->ID, 'product_cat');
if(!is_wp_error($terms)) {
$product_category_slug = $terms[0]->slug;
$product_category_name = $terms[0]->name;
}
?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_bloginfo('url'); ?>/products/<?php echo $product_category_slug; ?>/",
"name": "<?php echo $product_category_name; ?>"
}
},
{
"@type": "ListItem",
"position": 2,
"item":
{
"@id": "<?php echo get_permalink(); ?>",
"name": "<?php echo get_the_title(); ?>"
}
}
<?php } elseif (is_page() && !is_front_page()) { // if on a regular WP Page
global $post;
if ( is_page() && $post->post_parent ) { // if is a child page
$post_data = get_post($post->post_parent);
$parent_page_slug = $post_data->post_name;
$parent_page_url = get_bloginfo('url').'/'.$parent_page_slug.'/';
$parent_page_title = ucfirst($parent_page_slug);
$position_number = '2';
} else {
$page_url = get_permalink();
$page_title = '';
$position_number = '1';
} ?>
<?php if ( is_page() && $post->post_parent ) { ?>{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo $parent_page_url; ?>",
"name": "<?php echo $parent_page_title; ?>"
}
},<?php } ?>
{
"@type": "ListItem",
"position": <?php echo $position_number; ?>,
"item":
{
"@id": "<?php echo get_permalink(); ?>",
"name": "<?php echo get_the_title(); ?>"
}
}
<?php } elseif (is_home()) { // if on the blog page ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_site_url('url').$blog_posts_page_slug; ?>",
"name": "<?php echo $site_name; ?>"
}
}
<?php } elseif (is_category() || is_tag()) { ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_site_url('url').$blog_posts_page_slug; ?>",
"name": "<?php echo $site_name; ?>"
}
},
{
"@type": "ListItem",
"position": 2,
"item":
{
"@id": "<?php echo 'https://'.$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; ?>",
"name": "<?php if (is_category()) { echo single_cat_title('', false); } else { echo single_tag_title('', false); } ?>"
}
}
<?php } elseif (is_tax('product_cat') || is_tax('product_tag')) { // product category and taxonomy pages
global $post; $termname = get_query_var( 'term' ); $termname = ucfirst($termname); ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_bloginfo('url'); ?>",
"name": "Store"
}
},
{
"@type": "ListItem",
"position": 2,
"item":
{
"@id": "<?php echo 'https://'.$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; ?>",
"name": "<?php echo $termname; ?>"
}
}
<?php } elseif (is_archive()) { // date based archives and a catch all for the rest ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo get_site_url('url').$blog_posts_page_slug; ?>",
"name": "<?php echo $site_name; ?>"
}
},
{
"@type": "ListItem",
"position": 2,
"item":
{
"@id": "<?php echo 'https://'.$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; ?>",
"name": "Archives"
}
}
<?php } else { ?>
{
"@type": "ListItem",
"position": 1,
"item":
{
"@id": "<?php echo 'https://'.$_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; ?>",
"name": "Page"
}
}
<?php } ?>]
}
</script>
<?php }
}