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Name	Size	Permission
ID3	[ DIR ]	drwxr-xr-x
IXR	[ DIR ]	drwxr-xr-x
PHPMailer	[ DIR ]	drwxr-xr-x
Requests	[ DIR ]	drwxr-xr-x
SimplePie	[ DIR ]	drwxr-xr-x
Text	[ DIR ]	drwxr-xr-x
assets	[ DIR ]	drwxr-xr-x
block-bindings	[ DIR ]	drwxr-xr-x
block-patterns	[ DIR ]	drwxr-xr-x
block-supports	[ DIR ]	drwxr-xr-x
blocks	[ DIR ]	drwxr-xr-x
certificates	[ DIR ]	drwxr-xr-x
css	[ DIR ]	drwxr-xr-x
customize	[ DIR ]	drwxr-xr-x
fonts	[ DIR ]	drwxr-xr-x
html-api	[ DIR ]	drwxr-xr-x
images	[ DIR ]	drwxr-xr-x
interactivity-api	[ DIR ]	drwxr-xr-x
js	[ DIR ]	drwxr-xr-x
l10n	[ DIR ]	drwxr-xr-x
php-compat	[ DIR ]	drwxr-xr-x
pomo	[ DIR ]	drwxr-xr-x
rest-api	[ DIR ]	drwxr-xr-x
sitemaps	[ DIR ]	drwxr-xr-x
sodium_compat	[ DIR ]	drwxr-xr-x
style-engine	[ DIR ]	drwxr-xr-x
theme-compat	[ DIR ]	drwxr-xr-x
widgets	[ DIR ]	drwxr-xr-x
admin-bar.php	36.23 KB	-rw-r--r--
atomlib.php	11.79 KB	-rw-r--r--
author-template.php	18.51 KB	-rw-r--r--
block-bindings.php	5.46 KB	-rw-r--r--
block-editor.php	27.68 KB	-rw-r--r--
block-i18n.json	316 B	-rw-r--r--
block-patterns.php	12.81 KB	-rw-r--r--
block-template-utils.php	58.74 KB	-rw-r--r--
block-template.php	13.81 KB	-rw-r--r--
blocks.php	102.36 KB	-rw-r--r--
bookmark-template.php	12.64 KB	-rw-r--r--
bookmark.php	15.07 KB	-rw-r--r--
cache-compat.php	5.83 KB	-rw-r--r--
cache.php	13.16 KB	-rw-r--r--
canonical.php	33.71 KB	-rw-r--r--
capabilities.php	41.72 KB	-rw-r--r--
category-template.php	55.67 KB	-rw-r--r--
category.php	12.41 KB	-rw-r--r--
class-IXR.php	2.48 KB	-rw-r--r--
class-avif-info.php	28.92 KB	-rw-r--r--
class-feed.php	539 B	-rw-r--r--
class-http.php	367 B	-rw-r--r--
class-json.php	42.66 KB	-rw-r--r--
class-oembed.php	401 B	-rw-r--r--
class-phpass.php	6.61 KB	-rw-r--r--
class-phpmailer.php	664 B	-rw-r--r--
class-pop3.php	20.68 KB	-rw-r--r--
class-requests.php	2.18 KB	-rw-r--r--
class-simplepie.php	453 B	-rw-r--r--
class-smtp.php	457 B	-rw-r--r--
class-snoopy.php	36.83 KB	-rw-r--r--
class-walker-category-dropdown...	2.41 KB	-rw-r--r--
class-walker-category.php	8.28 KB	-rw-r--r--
class-walker-comment.php	13.89 KB	-rw-r--r--
class-walker-nav-menu.php	11.51 KB	-rw-r--r--
class-walker-page-dropdown.php	2.65 KB	-rw-r--r--
class-walker-page.php	7.43 KB	-rw-r--r--
class-wp-admin-bar.php	17.46 KB	-rw-r--r--
class-wp-ajax-response.php	5.14 KB	-rw-r--r--
class-wp-application-passwords...	15.25 KB	-rw-r--r--
class-wp-block-bindings-regist...	8.26 KB	-rw-r--r--
class-wp-block-bindings-source...	2.92 KB	-rw-r--r--
class-wp-block-editor-context....	1.32 KB	-rw-r--r--
class-wp-block-list.php	4.65 KB	-rw-r--r--
class-wp-block-metadata-regist...	8.16 KB	-rw-r--r--
class-wp-block-parser-block.ph...	2.5 KB	-rw-r--r--
class-wp-block-parser-frame.ph...	1.97 KB	-rw-r--r--
class-wp-block-parser.php	11.26 KB	-rw-r--r--
class-wp-block-pattern-categor...	5.25 KB	-rw-r--r--
class-wp-block-patterns-regist...	10.53 KB	-rw-r--r--
class-wp-block-styles-registry...	6.12 KB	-rw-r--r--
class-wp-block-supports.php	5.48 KB	-rw-r--r--
class-wp-block-template.php	1.99 KB	-rw-r--r--
class-wp-block-templates-regis...	7.06 KB	-rw-r--r--
class-wp-block-type-registry.p...	4.9 KB	-rw-r--r--
class-wp-block-type.php	16.86 KB	-rw-r--r--
class-wp-block.php	19.96 KB	-rw-r--r--
class-wp-classic-to-block-menu...	3.99 KB	-rw-r--r--
class-wp-comment-query.php	47.26 KB	-rw-r--r--
class-wp-comment.php	9.15 KB	-rw-r--r--
class-wp-customize-control.php	25.13 KB	-rw-r--r--
class-wp-customize-manager.php	197.79 KB	-rw-r--r--
class-wp-customize-nav-menus.p...	55.84 KB	-rw-r--r--
class-wp-customize-panel.php	10.39 KB	-rw-r--r--
class-wp-customize-section.php	10.95 KB	-rw-r--r--
class-wp-customize-setting.php	29.19 KB	-rw-r--r--
class-wp-customize-widgets.php	70.47 KB	-rw-r--r--
class-wp-date-query.php	34.89 KB	-rw-r--r--
class-wp-dependencies.php	14.78 KB	-rw-r--r--
class-wp-dependency.php	2.57 KB	-rw-r--r--
class-wp-duotone.php	39.83 KB	-rw-r--r--
class-wp-editor.php	70.64 KB	-rw-r--r--
class-wp-embed.php	15.62 KB	-rw-r--r--
class-wp-error.php	7.33 KB	-rw-r--r--
class-wp-exception.php	253 B	-rw-r--r--
class-wp-fatal-error-handler.p...	7.96 KB	-rw-r--r--
class-wp-feed-cache-transient....	3.1 KB	-rw-r--r--
class-wp-feed-cache.php	969 B	-rw-r--r--
class-wp-hook.php	15.63 KB	-rw-r--r--
class-wp-http-cookie.php	7.22 KB	-rw-r--r--
class-wp-http-curl.php	12.25 KB	-rw-r--r--
class-wp-http-encoding.php	6.53 KB	-rw-r--r--
class-wp-http-ixr-client.php	3.42 KB	-rw-r--r--
class-wp-http-proxy.php	5.84 KB	-rw-r--r--
class-wp-http-requests-hooks.p...	1.97 KB	-rw-r--r--
class-wp-http-requests-respons...	4.3 KB	-rw-r--r--
class-wp-http-response.php	2.91 KB	-rw-r--r--
class-wp-http-streams.php	16.46 KB	-rw-r--r--
class-wp-http.php	40.53 KB	-rw-r--r--
class-wp-image-editor-gd.php	19.42 KB	-rw-r--r--
class-wp-image-editor-imagick....	31.9 KB	-rw-r--r--
class-wp-image-editor.php	16.54 KB	-rw-r--r--
class-wp-list-util.php	7.27 KB	-rw-r--r--
class-wp-locale-switcher.php	6.47 KB	-rw-r--r--
class-wp-locale.php	15.73 KB	-rw-r--r--
class-wp-matchesmapregex.php	1.79 KB	-rw-r--r--
class-wp-meta-query.php	29.82 KB	-rw-r--r--
class-wp-metadata-lazyloader.p...	6.67 KB	-rw-r--r--
class-wp-navigation-fallback.p...	9 KB	-rw-r--r--
class-wp-network-query.php	19.39 KB	-rw-r--r--
class-wp-network.php	12.01 KB	-rw-r--r--
class-wp-object-cache.php	17.11 KB	-rw-r--r--
class-wp-oembed-controller.php	6.74 KB	-rw-r--r--
class-wp-oembed.php	30.74 KB	-rw-r--r--
class-wp-paused-extensions-sto...	4.99 KB	-rw-r--r--
class-wp-plugin-dependencies.p...	24.73 KB	-rw-r--r--
class-wp-post-type.php	29.63 KB	-rw-r--r--
class-wp-post.php	6.33 KB	-rw-r--r--
class-wp-query.php	150.47 KB	-rw-r--r--
class-wp-recovery-mode-cookie-...	6.72 KB	-rw-r--r--
class-wp-recovery-mode-email-s...	10.92 KB	-rw-r--r--
class-wp-recovery-mode-key-ser...	4.5 KB	-rw-r--r--
class-wp-recovery-mode-link-se...	3.38 KB	-rw-r--r--
class-wp-recovery-mode.php	11.17 KB	-rw-r--r--
class-wp-rewrite.php	62.2 KB	-rw-r--r--
class-wp-role.php	2.46 KB	-rw-r--r--
class-wp-roles.php	8.38 KB	-rw-r--r--
class-wp-script-modules.php	18.91 KB	-rw-r--r--
class-wp-scripts.php	27.68 KB	-rw-r--r--
class-wp-session-tokens.php	7.28 KB	-rw-r--r--
class-wp-simplepie-file.php	3.33 KB	-rw-r--r--
class-wp-simplepie-sanitize-ks...	1.79 KB	-rw-r--r--
class-wp-site-query.php	30.88 KB	-rw-r--r--
class-wp-site.php	7.28 KB	-rw-r--r--
class-wp-styles.php	10.75 KB	-rw-r--r--
class-wp-tax-query.php	19.1 KB	-rw-r--r--
class-wp-taxonomy.php	18.13 KB	-rw-r--r--
class-wp-term-query.php	39.91 KB	-rw-r--r--
class-wp-term.php	5.17 KB	-rw-r--r--
class-wp-text-diff-renderer-in...	979 B	-rw-r--r--
class-wp-text-diff-renderer-ta...	18.37 KB	-rw-r--r--
class-wp-textdomain-registry.p...	10.24 KB	-rw-r--r--
class-wp-theme-json-data.php	1.77 KB	-rw-r--r--
class-wp-theme-json-resolver.p...	34.97 KB	-rw-r--r--
class-wp-theme-json-schema.php	7.19 KB	-rw-r--r--
class-wp-theme-json.php	157.01 KB	-rw-r--r--
class-wp-theme.php	63.88 KB	-rw-r--r--
class-wp-token-map.php	27.95 KB	-rw-r--r--
class-wp-user-meta-session-tok...	2.92 KB	-rw-r--r--
class-wp-user-query.php	42.63 KB	-rw-r--r--
class-wp-user-request.php	2.17 KB	-rw-r--r--
class-wp-user.php	22.29 KB	-rw-r--r--
class-wp-walker.php	13.01 KB	-rw-r--r--
class-wp-widget-factory.php	3.27 KB	-rw-r--r--
class-wp-widget.php	17.99 KB	-rw-r--r--
class-wp-xmlrpc-server.php	209.91 KB	-rw-r--r--
class-wp.php	25.51 KB	-rw-r--r--
class-wpdb.php	115.61 KB	-rw-r--r--
class.wp-dependencies.php	373 B	-rw-r--r--
class.wp-scripts.php	343 B	-rw-r--r--
class.wp-styles.php	338 B	-rw-r--r--
comment-template.php	100.36 KB	-rw-r--r--
comment.php	127.22 KB	-rw-r--r--
compat.php	16.58 KB	-rw-r--r--
cron.php	40.62 KB	-rw-r--r--
date.php	400 B	-rw-r--r--
default-constants.php	11.1 KB	-rw-r--r--
default-filters.php	34.85 KB	-rw-r--r--
default-widgets.php	2.17 KB	-rw-r--r--
deprecated.php	185.67 KB	-rw-r--r--
embed-template.php	338 B	-rw-r--r--
embed.php	37.02 KB	-rw-r--r--
error-protection.php	4.02 KB	-rw-r--r--
error_log	977.58 KB	-rw-r--r--
feed-atom-comments.php	5.38 KB	-rw-r--r--
feed-atom.php	2.98 KB	-rw-r--r--
feed-rdf.php	2.61 KB	-rw-r--r--
feed-rss.php	1.16 KB	-rw-r--r--
feed-rss2-comments.php	4.04 KB	-rw-r--r--
feed-rss2.php	3.71 KB	-rw-r--r--
feed.php	22.86 KB	-rw-r--r--
fonts.php	9.52 KB	-rw-r--r--
formatting.php	327.37 KB	-rw-r--r--
functions.php	276.53 KB	-rw-r--r--
functions.wp-scripts.php	14.22 KB	-rw-r--r--
functions.wp-styles.php	8.38 KB	-rw-r--r--
general-template.php	165.52 KB	-rw-r--r--
global-styles-and-settings.php	20.71 KB	-rw-r--r--
http.php	24.72 KB	-rw-r--r--
https-detection.php	5.53 KB	-rw-r--r--
https-migration.php	4.63 KB	-rw-r--r--
kses.php	72.66 KB	-rw-r--r--
l10n.php	66.81 KB	-rw-r--r--
link-template.php	154.01 KB	-rw-r--r--
load.php	54.35 KB	-rw-r--r--
locale.php	162 B	-rw-r--r--
media-template.php	61.57 KB	-rw-r--r--
media.php	213.3 KB	-rw-r--r--
meta.php	62.9 KB	-rw-r--r--
ms-blogs.php	25.17 KB	-rw-r--r--
ms-default-constants.php	4.81 KB	-rw-r--r--
ms-default-filters.php	6.48 KB	-rw-r--r--
ms-deprecated.php	21.25 KB	-rw-r--r--
ms-files.php	2.65 KB	-rw-r--r--
ms-functions.php	89.11 KB	-rw-r--r--
ms-load.php	19.42 KB	-rw-r--r--
ms-network.php	3.69 KB	-rw-r--r--
ms-settings.php	4.03 KB	-rw-r--r--
ms-site.php	39.54 KB	-rw-r--r--
nav-menu-template.php	25.31 KB	-rw-r--r--
nav-menu.php	43.33 KB	-rw-r--r--
option.php	99.37 KB	-rw-r--r--
pluggable-deprecated.php	6.12 KB	-rw-r--r--
pluggable.php	113.25 KB	-rw-r--r--
plugin.php	34.63 KB	-rw-r--r--
post-formats.php	6.94 KB	-rw-r--r--
post-template.php	65.31 KB	-rw-r--r--
post-thumbnail-template.php	10.57 KB	-rw-r--r--
post.php	283.1 KB	-rw-r--r--
query.php	36.17 KB	-rw-r--r--
registration-functions.php	200 B	-rw-r--r--
registration.php	200 B	-rw-r--r--
rest-api.php	97.26 KB	-rw-r--r--
revision.php	30.17 KB	-rw-r--r--
rewrite.php	19.08 KB	-rw-r--r--
robots-template.php	5.06 KB	-rw-r--r--
rss-functions.php	255 B	-rw-r--r--
rss.php	22.57 KB	-rw-r--r--
script-loader.php	127.52 KB	-rw-r--r--
script-modules.php	7.53 KB	-rw-r--r--
session.php	258 B	-rw-r--r--
shortcodes.php	23.49 KB	-rw-r--r--
sitemaps.php	3.16 KB	-rw-r--r--
spl-autoload-compat.php	441 B	-rw-r--r--
style-engine.php	7.39 KB	-rw-r--r--
taxonomy.php	171.33 KB	-rw-r--r--
template-canvas.php	544 B	-rw-r--r--
template-loader.php	2.94 KB	-rw-r--r--
template.php	23.59 KB	-rw-r--r--
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theme.json	8.5 KB	-rw-r--r--
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user.php	170.32 KB	-rw-r--r--
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version.php	931 B	-rw-r--r--
widgets.php	69.03 KB	-rw-r--r--
wp-db.php	445 B	-rw-r--r--
wp-diff.php	726 B	-rw-r--r--

Code Editor : 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 ] );
	}
}

${this.title}

Code Editor : class-wp-walker.php