render_block_core_breadcrumbs( array $attributes, string $content, WP_Block $block ): string

19function render_block_core_breadcrumbs( $attributes, $content, $block ) {20	$is_front_page = is_front_page();21 22	if ( ! $attributes['showOnHomePage'] && $is_front_page ) {23		return '';24	}25 26	$is_home          = is_home();27	$page_for_posts   = get_option( 'page_for_posts' );28	$breadcrumb_items = array();29 30	if ( $attributes['showHomeItem'] ) {31		// We make `home` a link if not on front page, or if front page32		// is set to a custom page and is paged.33		if ( ! $is_front_page || ( 'page' === get_option( 'show_on_front' ) && (int) get_query_var( 'page' ) > 1 ) ) {34			$breadcrumb_items[] = array(35				'label' => __( 'Home' ),36				'url'   => home_url( '/' ),37			);38		} else {39			$breadcrumb_items[] = block_core_breadcrumbs_create_item( __( 'Home' ), block_core_breadcrumbs_is_paged() );40		}41	}42 43	// Handle home.44	if ( $is_home ) {45		// These checks are explicitly nested in order not to execute the `else` branch.46		if ( $page_for_posts ) {47			$breadcrumb_items[] = block_core_breadcrumbs_create_item( block_core_breadcrumbs_get_post_title( $page_for_posts ), block_core_breadcrumbs_is_paged() );48		}49		if ( block_core_breadcrumbs_is_paged() ) {50			$breadcrumb_items[] = block_core_breadcrumbs_create_page_number_item();51		}52	} elseif ( $is_front_page ) {53		// Handle front page.54		// This check is explicitly nested in order not to execute the `else` branch.55		// If front page is set to custom page and is paged, add the page number.56		if ( (int) get_query_var( 'page' ) > 1 ) {57			$breadcrumb_items[] = block_core_breadcrumbs_create_page_number_item( 'page' );58		}59	} elseif ( is_search() ) {60		// Handle search results.61		$is_paged = block_core_breadcrumbs_is_paged();62		/* translators: %s: search query */63		$text               = sprintf( __( 'Search results for: "%s"' ), wp_trim_words( get_search_query(), 10 ) );64		$breadcrumb_items[] = block_core_breadcrumbs_create_item( $text, $is_paged );65		// Add the "Page X" as the current page if paginated.66		if ( $is_paged ) {67			$breadcrumb_items[] = block_core_breadcrumbs_create_page_number_item();68		}69	} elseif ( is_404() ) {70		// Handle 404 pages.71		$breadcrumb_items[] = array(72			'label' => __( 'Page not found' ),73		);74	} elseif ( is_archive() ) {75		// Handle archive pages (taxonomy, post type, date, author archives).76		$archive_breadcrumbs = block_core_breadcrumbs_get_archive_breadcrumbs();77		if ( ! empty( $archive_breadcrumbs ) ) {78			$breadcrumb_items = array_merge( $breadcrumb_items, $archive_breadcrumbs );79		}80	} else {81		// Handle single post/page breadcrumbs.82		if ( ! isset( $block->context['postId'] ) || ! isset( $block->context['postType'] ) ) {83			return '';84		}85 86		$post_id   = $block->context['postId'];87		$post_type = $block->context['postType'];88 89		$post = get_post( $post_id );90		if ( ! $post ) {91			return '';92		}93 94		// For non-hierarchical post types with parents (e.g., attachments), build trail for the parent.95		$post_parent = $post->post_parent;96		$parent_post = null;97		if ( ! is_post_type_hierarchical( $post_type ) && $post_parent ) {98			$parent_post = get_post( $post_parent );