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📝 Edit File: post-navigation-link.php

<?php
/**
 * Server-side rendering of the `core/post-navigation-link` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/post-navigation-link` block on the server.
 *
 * @since 5.9.0
 *
 * @param array  $attributes Block attributes.
 * @param string $content    Block default content.
 *
 * @return string Returns the next or previous post link that is adjacent to the current post.
 */
function render_block_core_post_navigation_link( $attributes, $content ) {
	if ( ! is_singular() ) {
		return '';
	}

// Get the navigation type to show the proper link. Available options are `next|previous`.
	$navigation_type = isset( $attributes['type'] ) ? $attributes['type'] : 'next';
	// Allow only `next` and `previous` in `$navigation_type`.
	if ( ! in_array( $navigation_type, array( 'next', 'previous' ), true ) ) {
		return '';
	}
	$classes = "post-navigation-link-$navigation_type";
	if ( isset( $attributes['textAlign'] ) ) {
		$classes .= " has-text-align-{$attributes['textAlign']}";
	}
	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			'class' => $classes,
		)
	);
	// Set default values.
	$format = '%link';
	$link   = 'next' === $navigation_type ? _x( 'Next', 'label for next post link' ) : _x( 'Previous', 'label for previous post link' );
	$label  = '';

// Only use hardcoded values here, otherwise we need to add escaping where these values are used.
	$arrow_map = array(
		'none'    => '',
		'arrow'   => array(
			'next'     => '→',
			'previous' => '←',
		),
		'chevron' => array(
			'next'     => '»',
			'previous' => '«',
		),
	);

// If a custom label is provided, make this a link.
	// `$label` is used to prepend the provided label, if we want to show the page title as well.
	if ( isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ) {
		$label = "{$attributes['label']}";
		$link  = $label;
	}

// If we want to also show the page title, make the page title a link and prepend the label.
	if ( isset( $attributes['showTitle'] ) && $attributes['showTitle'] ) {
		/*
		 * If the label link option is not enabled but there is a custom label,
		 * display the custom label as text before the linked title.
		 */
		if ( ! $attributes['linkLabel'] ) {
			if ( $label ) {
				$format = '' . wp_kses_post( $label ) . ' %link';
			}
			$link = '%title';
		} elseif ( isset( $attributes['linkLabel'] ) && $attributes['linkLabel'] ) {
			// If the label link option is enabled and there is a custom label, display it before the title.
			if ( $label ) {
				$link = '' . wp_kses_post( $label ) . ' %title';
			} else {
				/*
				 * If the label link option is enabled and there is no custom label,
				 * add a colon between the label and the post title.
				 */
				$label = 'next' === $navigation_type ? _x( 'Next:', 'label before the title of the next post' ) : _x( 'Previous:', 'label before the title of the previous post' );
				$link = sprintf(
					'%1$s %2$s',
					wp_kses_post( $label ),
					'%title'
				);
			}
		}
	}

// Display arrows.
	if ( isset( $attributes['arrow'] ) && 'none' !== $attributes['arrow'] && isset( $arrow_map[ $attributes['arrow'] ] ) ) {
		$arrow = $arrow_map[ $attributes['arrow'] ][ $navigation_type ];

if ( 'next' === $navigation_type ) {
			$format = '%link' . $arrow . '';
		} else {
			$format = '' . $arrow . '%link';
		}
	}

/*
	 * The dynamic portion of the function name, `$navigation_type`,
	 * Refers to the type of adjacency, 'next' or 'previous'.
	 *
	 * @see https://developer.wordpress.org/reference/functions/get_previous_post_link/
	 * @see https://developer.wordpress.org/reference/functions/get_next_post_link/
	 */
	$get_link_function = "get_{$navigation_type}_post_link";

if ( ! empty( $attributes['taxonomy'] ) ) {
		$content = $get_link_function( $format, $link, true, '', $attributes['taxonomy'] );
	} else {
		$content = $get_link_function( $format, $link );
	}

return sprintf(
		'<div %1$s>%2$s</div>',
		$wrapper_attributes,
		$content
	);
}

/**
 * Registers the `core/post-navigation-link` block on the server.
 *
 * @since 5.9.0
 */
function register_block_core_post_navigation_link() {
	register_block_type_from_metadata(
		__DIR__ . '/post-navigation-link',
		array(
			'render_callback' => 'render_block_core_post_navigation_link',
		)
	);
}
add_action( 'init', 'register_block_core_post_navigation_link' );

Type	Item Name	Actions
📁	..
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📁	audio
📁	avatar
📁	block
📁	button
📁	buttons
📁	calendar
📁	categories
📁	code
📁	column
📁	columns
📁	comment-author-name
📁	comment-content
📁	comment-date
📁	comment-edit-link
📁	comment-reply-link
📁	comment-template
📁	comments
📁	comments-pagination
📁	comments-pagination-next
📁	comments-pagination-numbers
📁	comments-pagination-previous
📁	comments-title
📁	cover
📁	details
📁	embed
📁	file
📁	footnotes
📁	freeform
📁	gallery
📁	group
📁	heading
📁	home-link
📁	html
📁	image
📁	latest-comments
📁	latest-posts
📁	legacy-widget
📁	list
📁	list-item
📁	loginout
📁	media-text
📁	missing
📁	more
📁	navigation
📁	navigation-link
📁	navigation-submenu
📁	nextpage
📁	page-list
📁	page-list-item
📁	paragraph
📁	pattern
📁	post-author
📁	post-author-biography
📁	post-author-name
📁	post-comments-form
📁	post-content
📁	post-date
📁	post-excerpt
📁	post-featured-image
📁	post-navigation-link
📁	post-template
📁	post-terms
📁	post-title
📁	preformatted
📁	pullquote
📁	query
📁	query-no-results
📁	query-pagination
📁	query-pagination-next
📁	query-pagination-numbers
📁	query-pagination-previous
📁	query-title
📁	quote
📁	read-more
📁	rss
📁	search
📁	separator
📁	shortcode
📁	site-logo
📁	site-tagline
📁	site-title
📁	social-link
📁	social-links
📁	spacer
📁	table
📁	tag-cloud
📁	template-part
📁	term-description
📁	text-columns
📁	verse
📁	video
📁	widget-group
📄	archives.php
📄	avatar.php
📄	block.php
📄	blocks-json.php
📄	button.php
📄	calendar.php
📄	categories.php
📄	comment-author-name.php
📄	comment-content.php
📄	comment-date.php
📄	comment-edit-link.php
📄	comment-reply-link.php
📄	comment-template.php
📄	comments-pagination-next.php
📄	comments-pagination-numbers.php
📄	comments-pagination-previous.php
📄	comments-pagination.php
📄	comments-title.php
📄	comments.php
📄	cover.php
📄	file.php
📄	footnotes.php
📄	gallery.php
📄	heading.php
📄	home-link.php
📄	image.php
📄	index.php
📄	latest-comments.php
📄	latest-posts.php
📄	legacy-widget.php
📄	list.php
📄	loginout.php
📄	media-text.php
📄	navigation-link.php
📄	navigation-submenu.php
📄	navigation.php
📄	page-list-item.php
📄	page-list.php
📄	pattern.php
📄	post-author-biography.php
📄	post-author-name.php
📄	post-author.php
📄	post-comments-form.php
📄	post-content.php
📄	post-date.php
📄	post-excerpt.php
📄	post-featured-image.php
📄	post-navigation-link.php
📄	post-template.php
📄	post-terms.php
📄	post-title.php
📄	query-no-results.php
📄	query-pagination-next.php
📄	query-pagination-numbers.php
📄	query-pagination-previous.php
📄	query-pagination.php
📄	query-title.php
📄	query.php
📄	read-more.php
📄	require-dynamic-blocks.php
📄	require-static-blocks.php
📄	rss.php
📄	search.php
📄	shortcode.php
📄	site-logo.php
📄	site-tagline.php
📄	site-title.php
📄	social-link.php
📄	tag-cloud.php
📄	template-part.php
📄	term-description.php
📄	widget-group.php