FM / wp-includes

/home/techb158/public_html/wp-includes

Name	Size	Mode	Actions
abilities-api/	-	0755	rm
ai-client/	-	0755	rm
assets/	-	0777	rm
block-bindings/	-	0755	rm
block-patterns/	-	0777	rm
block-supports/	-	0777	rm
blocks/	-	0777	rm
build/	-	0755	rm
certificates/	-	0777	rm
css/	-	0777	rm
customize/	-	0777	rm
fonts/	-	0777	rm
html-api/	-	0755	rm
ID3/	-	0777	rm
images/	-	0777	rm
interactivity-api/	-	0755	rm
IXR/	-	0777	rm
js/	-	0777	rm
l10n/	-	0755	rm
php-ai-client/	-	0755	rm
php-compat/	-	0777	rm
PHPMailer/	-	0777	rm
pomo/	-	0777	rm
Requests/	-	0777	rm
rest-api/	-	0777	rm
SimplePie/	-	0777	rm
sitemaps/	-	0777	rm
sodium_compat/	-	0777	rm
style-engine/	-	0777	rm
Text/	-	0777	rm
theme-compat/	-	0777	rm
widgets/	-	0777	rm
.htaccess	178	0644	edit dl rm
abilities-api.php	32800	0666	edit dl rm
abilities.php	11797	0666	edit dl rm
admin-bar.php	40067	0666	edit dl rm
ai-client.php	2549	0666	edit dl rm
atomlib.php	12181	0666	edit dl rm
author-template.php	19844	0666	edit dl rm
block-bindings.php	7632	0666	edit dl rm
block-editor.php	28724	0666	edit dl rm
block-i18n.json	316	0666	edit dl rm
block-patterns.php	15606	0666	edit dl rm
block-template-utils.php	63168	0666	edit dl rm
block-template.php	18257	0666	edit dl rm
blocks.php	124205	0666	edit dl rm
bookmark-template.php	12768	0666	edit dl rm
bookmark.php	15427	0666	edit dl rm
cache-compat.php	11021	0666	edit dl rm
cache.php	13486	0666	edit dl rm
canonical.php	34786	0666	edit dl rm
capabilities.php	43584	0666	edit dl rm
category-template.php	56990	0666	edit dl rm
category.php	12834	0666	edit dl rm
class-avif-info.php	30008	0666	edit dl rm
class-feed.php	539	0666	edit dl rm
class-http.php	367	0666	edit dl rm
class-IXR.php	2609	0666	edit dl rm
class-json.php	43676	0666	edit dl rm
class-oembed.php	401	0666	edit dl rm
class-phpass.php	6771	0666	edit dl rm
class-phpmailer.php	664	0666	edit dl rm
class-pop3.php	21100	0666	edit dl rm
class-requests.php	2237	0666	edit dl rm
class-simplepie.php	453	0666	edit dl rm
class-smtp.php	457	0666	edit dl rm
class-snoopy.php	37715	0666	edit dl rm
class-walker-category-dropdown.php	2469	0666	edit dl rm
class-walker-category.php	8477	0666	edit dl rm
class-walker-comment.php	14221	0666	edit dl rm
class-walker-nav-menu.php	12044	0666	edit dl rm
class-walker-page-dropdown.php	2710	0666	edit dl rm
class-walker-page.php	7612	0666	edit dl rm
class-wp-admin-bar.php	18002	0666	edit dl rm
class-wp-ajax-response.php	5288	0666	edit dl rm
class-wp-application-passwords.php	17099	0666	edit dl rm
class-wp-block-bindings-registry.php	8263	0666	edit dl rm
class-wp-block-bindings-source.php	2992	0666	edit dl rm
class-wp-block-editor-context.php	1350	0666	edit dl rm
class-wp-block-list.php	4713	0666	edit dl rm
class-wp-block-metadata-registry.php	11846	0666	edit dl rm
class-wp-block-parser-block.php	2555	0666	edit dl rm
class-wp-block-parser-frame.php	1994	0666	edit dl rm
class-wp-block-parser.php	11525	0666	edit dl rm
class-wp-block-pattern-categories-registry.php	4383	0666	edit dl rm
class-wp-block-patterns-registry.php	10265	0666	edit dl rm
class-wp-block-processor.php	69914	0666	edit dl rm
class-wp-block-styles-registry.php	6419	0666	edit dl rm
class-wp-block-supports.php	7578	0666	edit dl rm
class-wp-block-template.php	2111	0666	edit dl rm
class-wp-block-templates-registry.php	7080	0666	edit dl rm
class-wp-block-type-registry.php	5305	0666	edit dl rm
class-wp-block-type.php	17222	0666	edit dl rm
class-wp-block.php	28236	0666	edit dl rm
class-wp-classic-to-block-menu-converter.php	4026	0666	edit dl rm
class-wp-comment-query.php	49040	0666	edit dl rm
class-wp-comment.php	17249	0666	edit dl rm
class-wp-connector-registry.php	15181	0666	edit dl rm
class-wp-customize-control.php	26112	0666	edit dl rm
class-wp-customize-manager.php	202908	0666	edit dl rm
class-wp-customize-nav-menus.php	58034	0666	edit dl rm
class-wp-customize-panel.php	10703	0666	edit dl rm
class-wp-customize-section.php	11209	0666	edit dl rm
class-wp-customize-setting.php	29956	0666	edit dl rm
class-wp-customize-widgets.php	72596	0666	edit dl rm
class-wp-date-query.php	35970	0666	edit dl rm
class-wp-dependencies.php	17089	0666	edit dl rm
class-wp-dependency.php	2653	0666	edit dl rm
class-wp-duotone.php	40836	0666	edit dl rm
class-wp-editor.php	72228	0666	edit dl rm
class-wp-embed.php	15908	0666	edit dl rm
class-wp-error.php	7514	0666	edit dl rm
class-wp-exception.php	253	0666	edit dl rm
class-wp-fatal-error-handler.php	8150	0666	edit dl rm
class-wp-feed-cache-transient.php	3304	0666	edit dl rm
class-wp-feed-cache.php	969	0666	edit dl rm
class-wp-filter-sentinel.php	760	0666	edit dl rm
class-wp-hook.php	17472	0666	edit dl rm
class-wp-http-cookie.php	7269	0666	edit dl rm
class-wp-http-curl.php	13261	0666	edit dl rm
class-wp-http-encoding.php	6689	0666	edit dl rm
class-wp-http-ixr-client.php	3516	0666	edit dl rm
class-wp-http-proxy.php	5980	0666	edit dl rm
class-wp-http-requests-hooks.php	2022	0666	edit dl rm
class-wp-http-requests-response.php	4243	0666	edit dl rm
class-wp-http-response.php	2977	0666	edit dl rm
class-wp-http-streams.php	16764	0666	edit dl rm
class-wp-http.php	41641	0666	edit dl rm
class-wp-icon-collections-registry.php	5805	0666	edit dl rm
class-wp-icons-registry.php	9903	0666	edit dl rm
class-wp-image-editor-gd.php	20741	0666	edit dl rm
class-wp-image-editor-imagick.php	43454	0666	edit dl rm
class-wp-image-editor.php	17456	0666	edit dl rm
class-wp-list-util.php	7443	0666	edit dl rm
class-wp-locale-switcher.php	6776	0666	edit dl rm
class-wp-locale.php	16848	0666	edit dl rm
class-wp-matchesmapregex.php	1828	0666	edit dl rm
class-wp-meta-query.php	30507	0666	edit dl rm
class-wp-metadata-lazyloader.php	6833	0666	edit dl rm
class-wp-navigation-fallback.php	9193	0666	edit dl rm
class-wp-network-query.php	19989	0666	edit dl rm
class-wp-network.php	12411	0666	edit dl rm
class-wp-object-cache.php	17524	0666	edit dl rm
class-wp-oembed-controller.php	6905	0666	edit dl rm
class-wp-oembed.php	34372	0666	edit dl rm
class-wp-paused-extensions-storage.php	5067	0666	edit dl rm
class-wp-phpmailer.php	4348	0666	edit dl rm
class-wp-plugin-dependencies.php	25209	0666	edit dl rm
class-wp-post-type.php	30672	0666	edit dl rm
class-wp-post.php	8806	0666	edit dl rm
class-wp-query.php	164148	0666	edit dl rm
class-wp-recovery-mode-cookie-service.php	6877	0666	edit dl rm
class-wp-recovery-mode-email-service.php	11162	0666	edit dl rm
class-wp-recovery-mode-key-service.php	4914	0666	edit dl rm
class-wp-recovery-mode-link-service.php	3523	0666	edit dl rm
class-wp-recovery-mode.php	11460	0666	edit dl rm
class-wp-rewrite.php	63693	0666	edit dl rm
class-wp-role.php	2523	0666	edit dl rm
class-wp-roles.php	9326	0666	edit dl rm
class-wp-script-modules.php	40743	0666	edit dl rm
class-wp-scripts.php	36754	0666	edit dl rm
class-wp-session-tokens.php	7319	0666	edit dl rm
class-wp-simplepie-file.php	3552	0666	edit dl rm
class-wp-simplepie-sanitize-kses.php	1903	0666	edit dl rm
class-wp-site-query.php	31482	0666	edit dl rm
class-wp-site.php	7836	0666	edit dl rm
class-wp-speculation-rules.php	7884	0666	edit dl rm
class-wp-styles.php	13316	0666	edit dl rm
class-wp-tax-query.php	19577	0666	edit dl rm
class-wp-taxonomy.php	18559	0666	edit dl rm
class-wp-term-query.php	40751	0666	edit dl rm
class-wp-term.php	5263	0666	edit dl rm
class-wp-text-diff-renderer-inline.php	979	0666	edit dl rm
class-wp-text-diff-renderer-table.php	18925	0666	edit dl rm
class-wp-textdomain-registry.php	10481	0666	edit dl rm
class-wp-theme-json-data.php	1805	0666	edit dl rm
class-wp-theme-json-resolver.php	35692	0666	edit dl rm
class-wp-theme-json-schema.php	7367	0666	edit dl rm
class-wp-theme-json.php	221506	0666	edit dl rm
class-wp-theme.php	65811	0666	edit dl rm
class-wp-token-map.php	29032	0666	edit dl rm
class-wp-url-pattern-prefixer.php	4802	0666	edit dl rm
class-wp-user-meta-session-tokens.php	2954	0666	edit dl rm
class-wp-user-query.php	44102	0666	edit dl rm
class-wp-user-request.php	2342	0666	edit dl rm
class-wp-user.php	23189	0666	edit dl rm
class-wp-view-config-data.php	29427	0666	edit dl rm
class-wp-walker.php	13292	0666	edit dl rm
class-wp-widget-factory.php	3343	0666	edit dl rm
class-wp-widget.php	19129	0644	edit dl rm
class-wp-xmlrpc-server.php	216272	0666	edit dl rm
class-wp.php	26371	0666	edit dl rm
class-wpdb.php	121437	0666	edit dl rm
class.wp-dependencies.php	373	0666	edit dl rm
class.wp-scripts.php	343	0666	edit dl rm
class.wp-styles.php	338	0666	edit dl rm
comment-template.php	103211	0666	edit dl rm
comment.php	150630	0666	edit dl rm
compat-utf8.php	19386	0666	edit dl rm
compat.php	23105	0644	edit dl rm
connectors.php	32922	0666	edit dl rm
cron.php	46266	0666	edit dl rm
date.php	400	0666	edit dl rm
default-constants.php	11365	0666	edit dl rm
default-filters.php	39500	0666	edit dl rm
default-widgets.php	2288	0666	edit dl rm
deprecated.php	193977	0666	edit dl rm
embed-template.php	338	0666	edit dl rm
embed.php	39215	0666	edit dl rm
error-protection.php	4092	0666	edit dl rm
feed-atom-comments.php	5504	0666	edit dl rm
feed-atom.php	3114	0666	edit dl rm
feed-rdf.php	2668	0666	edit dl rm
feed-rss.php	1189	0666	edit dl rm
feed-rss2-comments.php	4136	0666	edit dl rm
feed-rss2.php	3799	0666	edit dl rm
feed.php	25189	0666	edit dl rm
fonts.php	9789	0666	edit dl rm
formatting.php	357652	0666	edit dl rm
functions.php	295481	0666	edit dl rm
functions.wp-scripts.php	20492	0666	edit dl rm
functions.wp-styles.php	8654	0666	edit dl rm
general-template.php	183472	0666	edit dl rm
global-styles-and-settings.php	20780	0666	edit dl rm
http.php	28961	0666	edit dl rm
https-detection.php	5857	0666	edit dl rm
https-migration.php	4741	0666	edit dl rm
icons.php	6334	0666	edit dl rm
index.php	1088	0444	edit dl rm
json-schema.php	7802	0666	edit dl rm
kses.php	88497	0666	edit dl rm
kwa.txt	1	0644	edit dl rm
l10n.php	71415	0666	edit dl rm
link-template.php	160143	0666	edit dl rm
load.php	57148	0644	edit dl rm
locale.php	162	0666	edit dl rm
media-template.php	65759	0666	edit dl rm
media.php	236804	0666	edit dl rm
meta.php	66739	0666	edit dl rm
ms-blogs.php	26324	0666	edit dl rm
ms-default-constants.php	4921	0666	edit dl rm
ms-default-filters.php	6636	0666	edit dl rm
ms-deprecated.php	21787	0666	edit dl rm
ms-files.php	2857	0666	edit dl rm
ms-functions.php	93258	0644	edit dl rm
ms-load.php	20055	0666	edit dl rm
ms-network.php	3782	0666	edit dl rm
ms-settings.php	4197	0666	edit dl rm
ms-site.php	41729	0666	edit dl rm
nav-menu-template.php	25983	0666	edit dl rm
nav-menu.php	44269	0666	edit dl rm
option.php	105246	0666	edit dl rm
pluggable-deprecated.php	6324	0666	edit dl rm
pluggable.php	127919	0666	edit dl rm
plugin.php	39110	0644	edit dl rm
post-formats.php	7070	0666	edit dl rm
post-template.php	69129	0666	edit dl rm
post-thumbnail-template.php	10879	0666	edit dl rm
post.php	305215	0666	edit dl rm
query.php	37554	0666	edit dl rm
registration-functions.php	200	0666	edit dl rm
registration.php	200	0666	edit dl rm
rest-api.php	102951	0666	edit dl rm
revision.php	31241	0666	edit dl rm
rewrite.php	19567	0666	edit dl rm
robots-template.php	5185	0666	edit dl rm
rss-functions.php	277	0666	edit dl rm
rss.php	23203	0666	edit dl rm
script-loader.php	163550	0666	edit dl rm
script-modules.php	12311	0666	edit dl rm
session.php	258	0666	edit dl rm
shortcodes.php	24034	0666	edit dl rm
sitemaps.php	3238	0666	edit dl rm
speculative-loading.php	11880	0666	edit dl rm
spl-autoload-compat.php	441	0666	edit dl rm
style-engine.php	8045	0666	edit dl rm
taxonomy.php	178307	0666	edit dl rm
template-canvas.php	544	0666	edit dl rm
template-loader.php	4267	0666	edit dl rm
template.php	36824	0666	edit dl rm
theme-i18n.json	1892	0666	edit dl rm
theme-previews.php	2887	0666	edit dl rm
theme-templates.php	4060	0666	edit dl rm
theme.json	9480	0666	edit dl rm
theme.php	134641	0666	edit dl rm
update.php	38269	0666	edit dl rm
user.php	180301	0666	edit dl rm
utf8.php	6977	0666	edit dl rm
vars.php	6600	0666	edit dl rm
version.php	1809	0644	edit dl rm
view-config.php	19087	0666	edit dl rm
view-transitions.php	602	0666	edit dl rm
widgets.php	70866	0666	edit dl rm
wp-db.php	445	0666	edit dl rm
wp-diff.php	792	0666	edit dl rm

Edit: /home/techb158/public_html/wp-includes/class-wp-walker.php (13292B)

<?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 ) ) {

$root = array_first( $elements );

$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 ] );
	}
}

cmd: