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ðŸ“ ..
ðŸ“ ID3
ðŸ“ IXR
ðŸ“ PHPMailer
ðŸ“ Requests
ðŸ“ SimplePie
ðŸ“ Text
ðŸ“„ admin-bar.php(36.24 KB)
ðŸ“ assets
ðŸ“„ atomlib.php(11.79 KB)
ðŸ“„ author-template.php(18.51 KB)
ðŸ“ block-bindings
ðŸ“„ block-bindings.php(5.46 KB)
ðŸ“„ block-editor.php(28.12 KB)
ðŸ“„ block-i18n.json(316 B)
ðŸ“ block-patterns
ðŸ“„ block-patterns.php(12.9 KB)
ðŸ“ block-supports
ðŸ“„ block-template-utils.php(60.46 KB)
ðŸ“„ block-template.php(15 KB)
ðŸ“ blocks
ðŸ“„ blocks.php(109.11 KB)
ðŸ“„ bookmark-template.php(12.47 KB)
ðŸ“„ bookmark.php(15.07 KB)
ðŸ“„ cache-compat.php(5.83 KB)
ðŸ“„ cache.php(13.16 KB)
ðŸ“„ canonical.php(33.71 KB)
ðŸ“„ capabilities.php(41.72 KB)
ðŸ“„ category-template.php(55.67 KB)
ðŸ“„ category.php(12.53 KB)
ðŸ“ certificates
ðŸ“„ class-IXR.php(2.55 KB)
ðŸ“„ class-avif-info.php(28.92 KB)
ðŸ“„ class-feed.php(539 B)
ðŸ“„ class-http.php(367 B)
ðŸ“„ class-json.php(42.66 KB)
ðŸ“„ class-oembed.php(401 B)
ðŸ“„ class-phpass.php(6.61 KB)
ðŸ“„ class-phpmailer.php(664 B)
ðŸ“„ class-pop3.php(20.63 KB)
ðŸ“„ class-requests.php(2.18 KB)
ðŸ“„ class-simplepie.php(453 B)
ðŸ“„ class-smtp.php(457 B)
ðŸ“„ class-snoopy.php(36.83 KB)
ðŸ“„ class-walker-category-dropdown.php(2.41 KB)
ðŸ“„ class-walker-category.php(8.28 KB)
ðŸ“„ class-walker-comment.php(13.89 KB)
ðŸ“„ class-walker-nav-menu.php(11.76 KB)
ðŸ“„ class-walker-page-dropdown.php(2.65 KB)
ðŸ“„ class-walker-page.php(7.43 KB)
ðŸ“„ class-wp-admin-bar.php(17.46 KB)
ðŸ“„ class-wp-ajax-response.php(5.14 KB)
ðŸ“„ class-wp-application-passwords.php(16.7 KB)
ðŸ“„ class-wp-block-bindings-registry.php(8.26 KB)
ðŸ“„ class-wp-block-bindings-source.php(2.92 KB)
ðŸ“„ class-wp-block-editor-context.php(1.32 KB)
ðŸ“„ class-wp-block-list.php(4.65 KB)
ðŸ“„ class-wp-block-metadata-registry.php(11.62 KB)
ðŸ“„ class-wp-block-parser-block.php(2.5 KB)
ðŸ“„ class-wp-block-parser-frame.php(1.97 KB)
ðŸ“„ class-wp-block-parser.php(11.26 KB)
ðŸ“„ class-wp-block-pattern-categories-registry.php(5.25 KB)
ðŸ“„ class-wp-block-patterns-registry.php(10.53 KB)
ðŸ“„ class-wp-block-styles-registry.php(6.25 KB)
ðŸ“„ class-wp-block-supports.php(5.49 KB)
ðŸ“„ class-wp-block-template.php(1.99 KB)
ðŸ“„ class-wp-block-templates-registry.php(7.06 KB)
ðŸ“„ class-wp-block-type-registry.php(4.9 KB)
ðŸ“„ class-wp-block-type.php(16.86 KB)
ðŸ“„ class-wp-block.php(22.5 KB)
ðŸ“„ class-wp-classic-to-block-menu-converter.php(3.99 KB)
ðŸ“„ class-wp-comment-query.php(47.26 KB)
ðŸ“„ class-wp-comment.php(9.22 KB)
ðŸ“„ class-wp-customize-control.php(25.25 KB)
ðŸ“„ class-wp-customize-manager.php(197.84 KB)
ðŸ“„ class-wp-customize-nav-menus.php(56.07 KB)
ðŸ“„ class-wp-customize-panel.php(10.46 KB)
ðŸ“„ class-wp-customize-section.php(10.95 KB)
ðŸ“„ class-wp-customize-setting.php(29.26 KB)
ðŸ“„ class-wp-customize-widgets.php(70.52 KB)
ðŸ“„ class-wp-date-query.php(34.89 KB)
ðŸ“„ class-wp-dependencies.php(14.78 KB)
ðŸ“„ class-wp-dependency.php(2.57 KB)
ðŸ“„ class-wp-duotone.php(39.83 KB)
ðŸ“„ class-wp-editor.php(70.64 KB)
ðŸ“„ class-wp-embed.php(15.56 KB)
ðŸ“„ class-wp-error.php(7.33 KB)
ðŸ“„ class-wp-exception.php(253 B)
ðŸ“„ class-wp-fatal-error-handler.php(7.96 KB)
ðŸ“„ class-wp-feed-cache-transient.php(3.1 KB)
ðŸ“„ class-wp-feed-cache.php(969 B)
ðŸ“„ class-wp-hook.php(15.63 KB)
ðŸ“„ class-wp-http-cookie.php(7.22 KB)
ðŸ“„ class-wp-http-curl.php(12.25 KB)
ðŸ“„ class-wp-http-encoding.php(6.53 KB)
ðŸ“„ class-wp-http-ixr-client.php(3.42 KB)
ðŸ“„ class-wp-http-proxy.php(5.84 KB)
ðŸ“„ class-wp-http-requests-hooks.php(1.97 KB)
ðŸ“„ class-wp-http-requests-response.php(4.3 KB)
ðŸ“„ class-wp-http-response.php(2.91 KB)
ðŸ“„ class-wp-http-streams.php(16.46 KB)
ðŸ“„ class-wp-http.php(40.6 KB)
ðŸ“„ class-wp-image-editor-gd.php(19.69 KB)
ðŸ“„ class-wp-image-editor-imagick.php(33.92 KB)
ðŸ“„ class-wp-image-editor.php(17.12 KB)
ðŸ“„ class-wp-list-util.php(7.27 KB)
ðŸ“„ class-wp-locale-switcher.php(6.62 KB)
ðŸ“„ class-wp-locale.php(16.49 KB)
ðŸ“„ class-wp-matchesmapregex.php(1.79 KB)
ðŸ“„ class-wp-meta-query.php(29.82 KB)
ðŸ“„ class-wp-metadata-lazyloader.php(6.67 KB)
ðŸ“„ class-wp-navigation-fallback.php(9 KB)
ðŸ“„ class-wp-network-query.php(19.39 KB)
ðŸ“„ class-wp-network.php(12.01 KB)
ðŸ“„ class-wp-object-cache.php(17.11 KB)
ðŸ“„ class-wp-oembed-controller.php(6.74 KB)
ðŸ“„ class-wp-oembed.php(30.91 KB)
ðŸ“„ class-wp-paused-extensions-storage.php(4.99 KB)
ðŸ“„ class-wp-phpmailer.php(3.71 KB)
ðŸ“„ class-wp-plugin-dependencies.php(24.72 KB)
ðŸ“„ class-wp-post-type.php(29.96 KB)
ðŸ“„ class-wp-post.php(6.34 KB)
ðŸ“„ class-wp-query.php(154.32 KB)
ðŸ“„ class-wp-recovery-mode-cookie-service.php(6.72 KB)
ðŸ“„ class-wp-recovery-mode-email-service.php(10.92 KB)
ðŸ“„ class-wp-recovery-mode-key-service.php(4.77 KB)
ðŸ“„ class-wp-recovery-mode-link-service.php(3.38 KB)
ðŸ“„ class-wp-recovery-mode.php(11.18 KB)
ðŸ“„ class-wp-rewrite.php(62.2 KB)
ðŸ“„ class-wp-role.php(2.46 KB)
ðŸ“„ class-wp-roles.php(8.38 KB)
ðŸ“„ class-wp-script-modules.php(19.01 KB)
ðŸ“„ class-wp-scripts.php(27.68 KB)
ðŸ“„ class-wp-session-tokens.php(7.15 KB)
ðŸ“„ class-wp-simplepie-file.php(3.33 KB)
ðŸ“„ class-wp-simplepie-sanitize-kses.php(1.87 KB)
ðŸ“„ class-wp-site-query.php(30.88 KB)
ðŸ“„ class-wp-site.php(7.28 KB)
ðŸ“„ class-wp-speculation-rules.php(7.35 KB)
ðŸ“„ class-wp-styles.php(10.75 KB)
ðŸ“„ class-wp-tax-query.php(19.1 KB)
ðŸ“„ class-wp-taxonomy.php(18.12 KB)
ðŸ“„ class-wp-term-query.php(39.91 KB)
ðŸ“„ class-wp-term.php(5.17 KB)
ðŸ“„ class-wp-text-diff-renderer-inline.php(979 B)
ðŸ“„ class-wp-text-diff-renderer-table.php(18.44 KB)
ðŸ“„ class-wp-textdomain-registry.php(10.24 KB)
ðŸ“„ class-wp-theme-json-data.php(1.77 KB)
ðŸ“„ class-wp-theme-json-resolver.php(34.9 KB)
ðŸ“„ class-wp-theme-json-schema.php(7.19 KB)
ðŸ“„ class-wp-theme-json.php(159.71 KB)
ðŸ“„ class-wp-theme.php(64.27 KB)
ðŸ“„ class-wp-token-map.php(27.95 KB)
ðŸ“„ class-wp-url-pattern-prefixer.php(4.69 KB)
ðŸ“„ class-wp-user-meta-session-tokens.php(2.92 KB)
ðŸ“„ class-wp-user-query.php(42.63 KB)
ðŸ“„ class-wp-user-request.php(2.25 KB)
ðŸ“„ class-wp-user.php(22.46 KB)
ðŸ“„ class-wp-walker.php(13.01 KB)
ðŸ“„ class-wp-widget-factory.php(3.27 KB)
ðŸ“„ class-wp-widget.php(18 KB)
ðŸ“„ class-wp-xmlrpc-server.php(210.39 KB)
ðŸ“„ class-wp.php(25.7 KB)
ðŸ“„ class-wpdb.php(115.51 KB)
ðŸ“„ class.wp-dependencies.php(373 B)
ðŸ“„ class.wp-scripts.php(343 B)
ðŸ“„ class.wp-styles.php(338 B)
ðŸ“„ comment-template.php(100.47 KB)
ðŸ“„ comment.php(128.46 KB)
ðŸ“„ compat.php(15.99 KB)
ðŸ“„ cron.php(41.66 KB)
ðŸ“ css
ðŸ“ customize
ðŸ“„ date.php(400 B)
ðŸ“„ default-constants.php(11.1 KB)
ðŸ“„ default-filters.php(35.84 KB)
ðŸ“„ default-widgets.php(2.24 KB)
ðŸ“„ deprecated.php(187.07 KB)
ðŸ“„ embed-template.php(338 B)
ðŸ“„ embed.php(37.28 KB)
ðŸ“„ error-protection.php(4.02 KB)
ðŸ“„ error_log(503.4 KB)
ðŸ“„ feed-atom-comments.php(5.38 KB)
ðŸ“„ feed-atom.php(3.05 KB)
ðŸ“„ feed-rdf.php(2.61 KB)
ðŸ“„ feed-rss.php(1.16 KB)
ðŸ“„ feed-rss2-comments.php(4.04 KB)
ðŸ“„ feed-rss2.php(3.71 KB)
ðŸ“„ feed.php(22.86 KB)
ðŸ“ fonts
ðŸ“„ fonts.php(9.52 KB)
ðŸ“„ formatting.php(334.24 KB)
ðŸ“„ functions.php(280.81 KB)
ðŸ“„ functions.wp-scripts.php(14.22 KB)
ðŸ“„ functions.wp-styles.php(8.38 KB)
ðŸ“„ general-template.php(168.46 KB)
ðŸ“„ global-styles-and-settings.php(20.76 KB)
ðŸ“ html-api
ðŸ“„ http.php(24.72 KB)
ðŸ“„ https-detection.php(5.72 KB)
ðŸ“„ https-migration.php(4.63 KB)
ðŸ“ images
ðŸ“ interactivity-api
ðŸ“ js
ðŸ“„ kses.php(72.73 KB)
ðŸ“ l10n
ðŸ“„ l10n.php(66.92 KB)
ðŸ“„ link-template.php(154.1 KB)
ðŸ“„ load.php(55.12 KB)
ðŸ“„ locale.php(162 B)
ðŸ“„ media-template.php(61.58 KB)
ðŸ“„ media.php(215.12 KB)
ðŸ“„ meta.php(63.71 KB)
ðŸ“„ ms-blogs.php(25.24 KB)
ðŸ“„ ms-default-constants.php(4.81 KB)
ðŸ“„ ms-default-filters.php(6.48 KB)
ðŸ“„ ms-deprecated.php(21.25 KB)
ðŸ“„ ms-files.php(2.68 KB)
ðŸ“„ ms-functions.php(89.44 KB)
ðŸ“„ ms-load.php(19.42 KB)
ðŸ“„ ms-network.php(3.69 KB)
ðŸ“„ ms-settings.php(4.1 KB)
ðŸ“„ ms-site.php(40.35 KB)
ðŸ“„ nav-menu-template.php(25.38 KB)
ðŸ“„ nav-menu.php(43.33 KB)
ðŸ“„ option.php(100.65 KB)
ðŸ“ php-compat
ðŸ“„ pluggable-deprecated.php(6.18 KB)
ðŸ“„ pluggable.php(119.82 KB)
ðŸ“„ plugin.php(34.63 KB)
ðŸ“ pomo
ðŸ“„ post-formats.php(6.94 KB)
ðŸ“„ post-template.php(67.04 KB)
ðŸ“„ post-thumbnail-template.php(10.62 KB)
ðŸ“„ post.php(284.88 KB)
ðŸ“„ query.php(36.17 KB)
ðŸ“„ registration-functions.php(200 B)
ðŸ“„ registration.php(200 B)
ðŸ“ rest-api
ðŸ“„ rest-api.php(97.91 KB)
ðŸ“„ revision.php(30.02 KB)
ðŸ“„ rewrite.php(19.08 KB)
ðŸ“„ robots-template.php(5.06 KB)
ðŸ“„ rss-functions.php(255 B)
ðŸ“„ rss.php(22.57 KB)
ðŸ“„ script-loader.php(130.14 KB)
ðŸ“„ script-modules.php(7.53 KB)
ðŸ“„ session.php(258 B)
ðŸ“„ shortcodes.php(23.49 KB)
ðŸ“ sitemaps
ðŸ“„ sitemaps.php(3.16 KB)
ðŸ“ sodium_compat
ðŸ“„ speculative-loading.php(8.36 KB)
ðŸ“„ spl-autoload-compat.php(441 B)
ðŸ“ style-engine
ðŸ“„ style-engine.php(7.39 KB)
ðŸ“„ taxonomy.php(172.1 KB)
ðŸ“„ template-canvas.php(544 B)
ðŸ“„ template-loader.php(2.94 KB)
ðŸ“„ template.php(23.59 KB)
ðŸ“ theme-compat
ðŸ“„ theme-i18n.json(1.49 KB)
ðŸ“„ theme-previews.php(2.77 KB)
ðŸ“„ theme-templates.php(6.09 KB)
ðŸ“„ theme.json(8.5 KB)
ðŸ“„ theme.php(131.16 KB)
ðŸ“„ update.php(36.62 KB)
ðŸ“„ user.php(171.7 KB)
ðŸ“„ vars.php(6.41 KB)
ðŸ“„ version.php(1.06 KB)
ðŸ“ widgets
ðŸ“„ widgets.php(69.06 KB)
ðŸ“„ wp-db.php(445 B)
ðŸ“„ wp-diff.php(799 B)

Editing: class-wp-walker.php

<?php
/**
 * A class for displaying various tree-like structures.
 *
 * Extend the Walker class to use it, see examples below. Child classes
 * do not need to implement all of the abstract methods in the class. The child
 * only needs to implement the methods that are needed.
 *
 * @since 2.1.0
 *
 * @package WordPress
 * @abstract
 */
#[AllowDynamicProperties]
class Walker {
	/**
	 * What the class handles.
	 *
	 * @since 2.1.0
	 * @var string
	 */
	public $tree_type;

/**
	 * DB fields to use.
	 *
	 * @since 2.1.0
	 * @var string[]
	 */
	public $db_fields;

/**
	 * Max number of pages walked by the paged walker.
	 *
	 * @since 2.7.0
	 * @var int
	 */
	public $max_pages = 1;

/**
	 * Whether the current element has children or not.
	 *
	 * To be used in start_el().
	 *
	 * @since 4.0.0
	 * @var bool
	 */
	public $has_children;

/**
	 * Starts the list before the elements are added.
	 *
	 * The $args parameter holds additional values that may be used with the child
	 * class methods. This method is called at the start of the output list.
	 *
	 * @since 2.1.0
	 * @abstract
	 *
	 * @param string $output Used to append additional content (passed by reference).
	 * @param int    $depth  Depth of the item.
	 * @param array  $args   An array of additional arguments.
	 */
	public function start_lvl( &$output, $depth = 0, $args = array() ) {}

/**
	 * Ends the list of after the elements are added.
	 *
	 * The $args parameter holds additional values that may be used with the child
	 * class methods. This method finishes the list at the end of output of the elements.
	 *
	 * @since 2.1.0
	 * @abstract
	 *
	 * @param string $output Used to append additional content (passed by reference).
	 * @param int    $depth  Depth of the item.
	 * @param array  $args   An array of additional arguments.
	 */
	public function end_lvl( &$output, $depth = 0, $args = array() ) {}

/**
	 * Starts the element output.
	 *
	 * The $args parameter holds additional values that may be used with the child
	 * class methods. Also includes the element output.
	 *
	 * @since 2.1.0
	 * @since 5.9.0 Renamed `$object` (a PHP reserved keyword) to `$data_object` for PHP 8 named parameter support.
	 * @abstract
	 *
	 * @param string $output            Used to append additional content (passed by reference).
	 * @param object $data_object       The data object.
	 * @param int    $depth             Depth of the item.
	 * @param array  $args              An array of additional arguments.
	 * @param int    $current_object_id Optional. ID of the current item. Default 0.
	 */
	public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {}

/**
	 * Ends the element output, if needed.
	 *
	 * The $args parameter holds additional values that may be used with the child class methods.
	 *
	 * @since 2.1.0
	 * @since 5.9.0 Renamed `$object` (a PHP reserved keyword) to `$data_object` for PHP 8 named parameter support.
	 * @abstract
	 *
	 * @param string $output      Used to append additional content (passed by reference).
	 * @param object $data_object The data object.
	 * @param int    $depth       Depth of the item.
	 * @param array  $args        An array of additional arguments.
	 */
	public function end_el( &$output, $data_object, $depth = 0, $args = array() ) {}

/**
	 * Traverses elements to create list from elements.
	 *
	 * Display one element if the element doesn't have any children otherwise,
	 * display the element and its children. Will only traverse up to the max
	 * depth and no ignore elements under that depth. It is possible to set the
	 * max depth to include all depths, see walk() method.
	 *
	 * This method should not be called directly, use the walk() method instead.
	 *
	 * @since 2.5.0
	 *
	 * @param object $element           Data object.
	 * @param array  $children_elements List of elements to continue traversing (passed by reference).
	 * @param int    $max_depth         Max depth to traverse.
	 * @param int    $depth             Depth of current element.
	 * @param array  $args              An array of arguments.
	 * @param string $output            Used to append additional content (passed by reference).
	 */
	public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
		if ( ! $element ) {
			return;
		}

$max_depth = (int) $max_depth;
		$depth     = (int) $depth;

$id_field = $this->db_fields['id'];
		$id       = $element->$id_field;

// Display this element.
		$this->has_children = ! empty( $children_elements[ $id ] );
		if ( isset( $args[0] ) && is_array( $args[0] ) ) {
			$args[0]['has_children'] = $this->has_children; // Back-compat.
		}

$this->start_el( $output, $element, $depth, ...array_values( $args ) );

// Descend only when the depth is right and there are children for this element.
		if ( ( 0 === $max_depth || $max_depth > $depth + 1 ) && isset( $children_elements[ $id ] ) ) {

foreach ( $children_elements[ $id ] as $child ) {

if ( ! isset( $newlevel ) ) {
					$newlevel = true;
					// Start the child delimiter.
					$this->start_lvl( $output, $depth, ...array_values( $args ) );
				}
				$this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
			}
			unset( $children_elements[ $id ] );
		}

if ( isset( $newlevel ) && $newlevel ) {
			// End the child delimiter.
			$this->end_lvl( $output, $depth, ...array_values( $args ) );
		}

// End this element.
		$this->end_el( $output, $element, $depth, ...array_values( $args ) );
	}

/**
	 * Displays array of elements hierarchically.
	 *
	 * Does not assume any existing order of elements.
	 *
	 * $max_depth = -1 means flatly display every element.
	 * $max_depth = 0 means display all levels.
	 * $max_depth > 0 specifies the number of display levels.
	 *
	 * @since 2.1.0
	 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it
	 *              to the function signature.
	 *
	 * @param array $elements  An array of elements.
	 * @param int   $max_depth The maximum hierarchical depth.
	 * @param mixed ...$args   Optional additional arguments.
	 * @return string The hierarchical item output.
	 */
	public function walk( $elements, $max_depth, ...$args ) {
		$output = '';

$max_depth = (int) $max_depth;

// Invalid parameter or nothing to walk.
		if ( $max_depth < -1 || empty( $elements ) ) {
			return $output;
		}

$parent_field = $this->db_fields['parent'];

// Flat display.
		if ( -1 === $max_depth ) {
			$empty_array = array();
			foreach ( $elements as $e ) {
				$this->display_element( $e, $empty_array, 1, 0, $args, $output );
			}
			return $output;
		}

/*
		 * Need to display in hierarchical order.
		 * Separate elements into two buckets: top level and children elements.
		 * Children_elements is two dimensional array. Example:
		 * Children_elements[10][] contains all sub-elements whose parent is 10.
		 */
		$top_level_elements = array();
		$children_elements  = array();
		foreach ( $elements as $e ) {
			if ( empty( $e->$parent_field ) ) {
				$top_level_elements[] = $e;
			} else {
				$children_elements[ $e->$parent_field ][] = $e;
			}
		}

/*
		 * When none of the elements is top level.
		 * Assume the first one must be root of the sub elements.
		 */
		if ( empty( $top_level_elements ) ) {

$first = array_slice( $elements, 0, 1 );
			$root  = $first[0];

$top_level_elements = array();
			$children_elements  = array();
			foreach ( $elements as $e ) {
				if ( $root->$parent_field === $e->$parent_field ) {
					$top_level_elements[] = $e;
				} else {
					$children_elements[ $e->$parent_field ][] = $e;
				}
			}
		}

foreach ( $top_level_elements as $e ) {
			$this->display_element( $e, $children_elements, $max_depth, 0, $args, $output );
		}

/*
		 * If we are displaying all levels, and remaining children_elements is not empty,
		 * then we got orphans, which should be displayed regardless.
		 */
		if ( ( 0 === $max_depth ) && count( $children_elements ) > 0 ) {
			$empty_array = array();
			foreach ( $children_elements as $orphans ) {
				foreach ( $orphans as $op ) {
					$this->display_element( $op, $empty_array, 1, 0, $args, $output );
				}
			}
		}

return $output;
	}

/**
	 * Produces a page of nested elements.
	 *
	 * Given an array of hierarchical elements, the maximum depth, a specific page number,
	 * and number of elements per page, this function first determines all top level root elements
	 * belonging to that page, then lists them and all of their children in hierarchical order.
	 *
	 * $max_depth = 0 means display all levels.
	 * $max_depth > 0 specifies the number of display levels.
	 *
	 * @since 2.7.0
	 * @since 5.3.0 Formalized the existing `...$args` parameter by adding it
	 *              to the function signature.
	 *
	 * @param array $elements  An array of elements.
	 * @param int   $max_depth The maximum hierarchical depth.
	 * @param int   $page_num  The specific page number, beginning with 1.
	 * @param int   $per_page  Number of elements per page.
	 * @param mixed ...$args   Optional additional arguments.
	 * @return string XHTML of the specified page of elements.
	 */
	public function paged_walk( $elements, $max_depth, $page_num, $per_page, ...$args ) {
		$output = '';

$max_depth = (int) $max_depth;

if ( empty( $elements ) || $max_depth < -1 ) {
			return $output;
		}

$parent_field = $this->db_fields['parent'];

$count = -1;
		if ( -1 === $max_depth ) {
			$total_top = count( $elements );
		}
		if ( $page_num < 1 || $per_page < 0 ) {
			// No paging.
			$paging = false;
			$start  = 0;
			if ( -1 === $max_depth ) {
				$end = $total_top;
			}
			$this->max_pages = 1;
		} else {
			$paging = true;
			$start  = ( (int) $page_num - 1 ) * (int) $per_page;
			$end    = $start + $per_page;
			if ( -1 === $max_depth ) {
				$this->max_pages = (int) ceil( $total_top / $per_page );
			}
		}

// Flat display.
		if ( -1 === $max_depth ) {
			if ( ! empty( $args[0]['reverse_top_level'] ) ) {
				$elements = array_reverse( $elements );
				$oldstart = $start;
				$start    = $total_top - $end;
				$end      = $total_top - $oldstart;
			}

$empty_array = array();
			foreach ( $elements as $e ) {
				++$count;
				if ( $count < $start ) {
					continue;
				}
				if ( $count >= $end ) {
					break;
				}
				$this->display_element( $e, $empty_array, 1, 0, $args, $output );
			}
			return $output;
		}

/*
		 * Separate elements into two buckets: top level and children elements.
		 * Children_elements is two dimensional array, e.g.
		 * $children_elements[10][] contains all sub-elements whose parent is 10.
		 */
		$top_level_elements = array();
		$children_elements  = array();
		foreach ( $elements as $e ) {
			if ( empty( $e->$parent_field ) ) {
				$top_level_elements[] = $e;
			} else {
				$children_elements[ $e->$parent_field ][] = $e;
			}
		}

$total_top = count( $top_level_elements );
		if ( $paging ) {
			$this->max_pages = (int) ceil( $total_top / $per_page );
		} else {
			$end = $total_top;
		}

if ( ! empty( $args[0]['reverse_top_level'] ) ) {
			$top_level_elements = array_reverse( $top_level_elements );
			$oldstart           = $start;
			$start              = $total_top - $end;
			$end                = $total_top - $oldstart;
		}
		if ( ! empty( $args[0]['reverse_children'] ) ) {
			foreach ( $children_elements as $parent => $children ) {
				$children_elements[ $parent ] = array_reverse( $children );
			}
		}

foreach ( $top_level_elements as $e ) {
			++$count;

// For the last page, need to unset earlier children in order to keep track of orphans.
			if ( $end >= $total_top && $count < $start ) {
					$this->unset_children( $e, $children_elements );
			}

if ( $count < $start ) {
				continue;
			}

if ( $count >= $end ) {
				break;
			}

$this->display_element( $e, $children_elements, $max_depth, 0, $args, $output );
		}

if ( $end >= $total_top && count( $children_elements ) > 0 ) {
			$empty_array = array();
			foreach ( $children_elements as $orphans ) {
				foreach ( $orphans as $op ) {
					$this->display_element( $op, $empty_array, 1, 0, $args, $output );
				}
			}
		}

return $output;
	}

/**
	 * Calculates the total number of root elements.
	 *
	 * @since 2.7.0
	 *
	 * @param array $elements Elements to list.
	 * @return int Number of root elements.
	 */
	public function get_number_of_root_elements( $elements ) {
		$num          = 0;
		$parent_field = $this->db_fields['parent'];

foreach ( $elements as $e ) {
			if ( empty( $e->$parent_field ) ) {
				++$num;
			}
		}
		return $num;
	}

/**
	 * Unsets all the children for a given top level element.
	 *
	 * @since 2.7.0
	 *
	 * @param object $element           The top level element.
	 * @param array  $children_elements The children elements.
	 */
	public function unset_children( $element, &$children_elements ) {
		if ( ! $element || ! $children_elements ) {
			return;
		}

$id_field = $this->db_fields['id'];
		$id       = $element->$id_field;

if ( ! empty( $children_elements[ $id ] ) && is_array( $children_elements[ $id ] ) ) {
			foreach ( (array) $children_elements[ $id ] as $child ) {
				$this->unset_children( $child, $children_elements );
			}
		}

unset( $children_elements[ $id ] );
	}
}

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