Breadcrumb Structured Data for Posts and Pages

add_action( 'wp_head', function () {
    if ( ! is_singular() || is_front_page() || defined( 'WPSEO_VERSION' ) || defined( 'RANK_MATH_VERSION' ) || defined( 'AIOSEO_VERSION' ) || defined( 'SEOPRESS_VERSION' ) || defined( 'THE_SEO_FRAMEWORK_VERSION' ) ) {
        return;
    }

    $post  = get_queried_object();
    $trail = array( array( get_bloginfo( 'name' ), home_url( '/' ) ) );

    if ( 'post' === $post->post_type ) {
        $categories = get_the_category( $post->ID );

        if ( $categories ) {
            $ids = array_reverse( get_ancestors( $categories[0]->term_id, 'category', 'taxonomy' ) );
            $ids[] = $categories[0]->term_id;

            foreach ( $ids as $term_id ) {
                $url = get_term_link( (int) $term_id, 'category' );

                if ( ! is_wp_error( $url ) ) {
                    $trail[] = array( get_term( $term_id, 'category' )->name, $url );
                }
            }
        }
    } elseif ( is_post_type_hierarchical( $post->post_type ) ) {
        foreach ( array_reverse( get_post_ancestors( $post ) ) as $ancestor ) {
            $trail[] = array( get_the_title( $ancestor ), get_permalink( $ancestor ) );
        }
    }

    $trail[] = array( get_the_title( $post ), get_permalink( $post ) );
    $list    = array();

    foreach ( $trail as $index => $crumb ) {
        $list[] = array(
            '@type'    => 'ListItem',
            'position' => $index + 1,
            'name'     => wp_strip_all_tags( $crumb[0] ),
            'item'     => $crumb[1],
        );
    }

    $data = array(
        '@context'        => 'https://schema.org',
        '@type'           => 'BreadcrumbList',
        'itemListElement' => $list,
    );

    echo '<script type="application/ld+json">' . wp_json_encode( $data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_HEX_TAG ) . "</script>\n";
} );