Gecko [ actualbuzz.com ]

Name	Size	Permission	Date
ID3	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
IXR	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
PHPMailer	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
Requests	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
SimplePie	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
Text	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
assets	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
block-patterns	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
block-supports	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
blocks	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
certificates	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
css	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
customize	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
fonts	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
html-api	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
images	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
js	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
php-compat	[ DIR ]	drwxr-xr-x	2025-10-14 08:33
pomo	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
random_compat	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
rest-api	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
sitemaps	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
sodium_compat	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
style-engine	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
theme-compat	[ DIR ]	drwxr-xr-x	2025-10-17 03:27
widgets	[ DIR ]	drwxr-xr-x	2025-10-10 06:41
.htaccess	127 B	-r--r--r--	2025-10-10 06:41
admin-bar.php	33.55 KB	-rw-r--r--	2025-10-17 03:27
atomlib.php	11.67 KB	-rw-r--r--	2022-04-21 23:54
author-template.php	18.43 KB	-rw-r--r--	2023-03-02 05:09
block-editor.php	23.61 KB	-rw-r--r--	2023-03-02 01:13
block-i18n.json	316 B	-rw-r--r--	2021-08-11 21:38
block-patterns.php	15.07 KB	-rw-r--r--	2023-02-07 09:10
block-template-utils.php	44.99 KB	-rw-r--r--	2023-05-30 12:14
block-template.php	10.56 KB	-rw-r--r--	2023-05-30 12:14
blocks.php	52.09 KB	-rw-r--r--	2024-06-24 21:25
bookmark-template.php	12.6 KB	-rw-r--r--	2022-06-24 11:27
bookmark.php	15 KB	-rw-r--r--	2023-02-22 06:09
cache-compat.php	5.83 KB	-rw-r--r--	2022-10-11 06:52
cache.php	13.16 KB	-rw-r--r--	2022-10-11 06:52
canonical.php	32.55 KB	-rw-r--r--	2023-02-16 02:36
capabilities.php	39.06 KB	-rw-r--r--	2022-11-30 05:21
category-template.php	55.67 KB	-rw-r--r--	2023-02-05 04:48
category.php	12.4 KB	-rw-r--r--	2025-10-17 03:27
class-IXR.php	2.48 KB	-rw-r--r--	2020-02-06 20:03
class-feed.php	529 B	-rw-r--r--	2020-02-06 20:03
class-http.php	367 B	-rw-r--r--	2022-06-17 23:50
class-json.php	42.66 KB	-rw-r--r--	2023-02-04 03:05
class-oembed.php	401 B	-rw-r--r--	2022-06-17 23:50
class-phpass.php	6.55 KB	-rw-r--r--	2023-02-13 22:38
class-phpmailer.php	664 B	-rw-r--r--	2020-07-22 01:28
class-pop3.php	20.48 KB	-rw-r--r--	2023-02-12 02:13
class-requests.php	2.18 KB	-rw-r--r--	2022-12-16 11:02
class-simplepie.php	95.78 KB	-rw-r--r--	2023-02-04 03:05
class-smtp.php	457 B	-rw-r--r--	2021-01-27 03:15
class-snoopy.php	36.83 KB	-rw-r--r--	2023-02-04 03:05
class-walker-category-dropdown.php	2.42 KB	-rw-r--r--	2022-01-31 08:55
class-walker-category.php	8.27 KB	-rw-r--r--	2022-01-31 08:55
class-walker-comment.php	13.88 KB	-rw-r--r--	2022-01-31 08:55
class-walker-nav-menu.php	9.35 KB	-rw-r--r--	2023-02-08 03:35
class-walker-page-dropdown.php	2.64 KB	-rw-r--r--	2022-05-02 10:31
class-walker-page.php	7.42 KB	-rw-r--r--	2022-01-31 08:55
class-wp-admin-bar.php	17.08 KB	-rw-r--r--	2022-11-30 05:21
class-wp-ajax-response.php	5.14 KB	-rw-r--r--	2022-09-13 04:17
class-wp-application-passwords.php	11.97 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-editor-context.php	1.32 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-list.php	4.64 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-parser.php	14.89 KB	-rw-r--r--	2023-02-07 20:34
class-wp-block-pattern-categories-registry.php	5.25 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-patterns-registry.php	8.51 KB	-rw-r--r--	2023-10-17 05:25
class-wp-block-styles-registry.php	5.75 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-supports.php	5.37 KB	-rw-r--r--	2023-02-07 04:54
class-wp-block-template.php	1.8 KB	-rw-r--r--	2022-09-13 04:17
class-wp-block-type-registry.php	4.9 KB	-rw-r--r--	2023-10-17 05:25
class-wp-block-type.php	13.68 KB	-rw-r--r--	2022-11-30 10:30
class-wp-block.php	8.21 KB	-rw-r--r--	2022-11-24 11:00
class-wp-comment-query.php	46.55 KB	-rw-r--r--	2022-09-13 04:17
class-wp-comment.php	9.13 KB	-rw-r--r--	2022-09-13 04:17
class-wp-customize-control.php	25.22 KB	-rw-r--r--	2023-02-08 06:40
class-wp-customize-manager.php	197.39 KB	-rw-r--r--	2023-02-24 00:08
class-wp-customize-nav-menus.php	55.96 KB	-rw-r--r--	2023-02-08 06:40
class-wp-customize-panel.php	10.42 KB	-rw-r--r--	2023-02-08 06:40
class-wp-customize-section.php	10.98 KB	-rw-r--r--	2023-02-08 06:40
class-wp-customize-setting.php	29.19 KB	-rw-r--r--	2022-09-13 04:17
class-wp-customize-widgets.php	69.95 KB	-rw-r--r--	2023-02-08 06:40
class-wp-date-query.php	34.84 KB	-rw-r--r--	2022-11-09 02:59
class-wp-dependencies.php	13.73 KB	-rw-r--r--	2022-11-26 04:42
class-wp-dependency.php	2.57 KB	-rw-r--r--	2022-11-26 04:42
class-wp-editor.php	70.27 KB	-rw-r--r--	2023-02-22 06:09
class-wp-embed.php	15.61 KB	-rw-r--r--	2023-02-20 04:35
class-wp-error.php	7.33 KB	-rw-r--r--	2023-02-22 06:09
class-wp-fatal-error-handler.php	7.69 KB	-rw-r--r--	2023-02-24 00:08
class-wp-feed-cache-transient.php	2.53 KB	-rw-r--r--	2022-09-13 04:17
class-wp-feed-cache.php	996 B	-rw-r--r--	2022-09-13 04:17
class-wp-hook.php	15.35 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-cookie.php	7.24 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-curl.php	12.12 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-encoding.php	6.53 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-ixr-client.php	3.42 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-proxy.php	5.84 KB	-rw-r--r--	2022-10-22 09:42
class-wp-http-requests-hooks.php	1.97 KB	-rw-r--r--	2022-12-16 11:02
class-wp-http-requests-response.php	4.3 KB	-rw-r--r--	2022-12-16 11:02
class-wp-http-response.php	2.91 KB	-rw-r--r--	2022-09-13 04:17
class-wp-http-streams.php	16.31 KB	-rw-r--r--	2023-01-14 03:52
class-wp-http.php	39.41 KB	-rw-r--r--	2023-02-21 15:19
class-wp-image-editor-gd.php	16.18 KB	-rw-r--r--	2022-09-20 11:23
class-wp-image-editor-imagick.php	29.04 KB	-rw-r--r--	2023-02-23 03:55
class-wp-image-editor.php	16.66 KB	-rw-r--r--	2022-10-08 07:47
class-wp-list-util.php	7.27 KB	-rw-r--r--	2023-02-26 00:29
class-wp-locale-switcher.php	6.39 KB	-rw-r--r--	2023-02-09 06:38
class-wp-locale.php	15.73 KB	-rw-r--r--	2023-02-16 13:07
class-wp-matchesmapregex.php	1.78 KB	-rw-r--r--	2022-09-13 04:17
class-wp-meta-query.php	29.8 KB	-rw-r--r--	2023-02-22 06:09
class-wp-metadata-lazyloader.php	5.25 KB	-rw-r--r--	2022-09-13 04:17
class-wp-network-query.php	18.83 KB	-rw-r--r--	2022-10-19 06:46
class-wp-network.php	11.89 KB	-rw-r--r--	2022-09-21 02:56
class-wp-object-cache.php	17.18 KB	-rw-r--r--	2022-09-27 10:40
class-wp-oembed-controller.php	6.72 KB	-rw-r--r--	2022-11-14 03:21
class-wp-oembed.php	30.45 KB	-rw-r--r--	2023-02-24 00:08
class-wp-paused-extensions-storage.php	4.94 KB	-rw-r--r--	2022-09-13 04:17
class-wp-post-type.php	25.18 KB	-rw-r--r--	2022-09-27 10:40
class-wp-post.php	6.33 KB	-rw-r--r--	2022-09-13 04:17
class-wp-query.php	146.4 KB	-rw-r--r--	2023-05-30 12:14
class-wp-recovery-mode-cookie-service.php	6.72 KB	-rw-r--r--	2022-10-04 16:29
class-wp-recovery-mode-email-service.php	10.92 KB	-rw-r--r--	2023-01-30 23:57
class-wp-recovery-mode-key-service.php	4.4 KB	-rw-r--r--	2023-02-22 05:29
class-wp-recovery-mode-link-service.php	3.38 KB	-rw-r--r--	2022-09-13 04:17
class-wp-recovery-mode.php	11.16 KB	-rw-r--r--	2022-09-13 04:17
class-wp-rewrite.php	61.6 KB	-rw-r--r--	2022-10-05 11:31
class-wp-role.php	2.46 KB	-rw-r--r--	2022-09-13 04:17
class-wp-roles.php	8.38 KB	-rw-r--r--	2022-10-25 03:26
class-wp-scripts.php	18.86 KB	-rw-r--r--	2022-09-29 10:49
class-wp-session-tokens.php	7.28 KB	-rw-r--r--	2022-09-13 04:17
class-wp-simplepie-file.php	3.32 KB	-rw-r--r--	2022-09-13 04:17
class-wp-simplepie-sanitize-kses.php	1.76 KB	-rw-r--r--	2022-09-13 04:17
class-wp-site-query.php	30.22 KB	-rw-r--r--	2022-10-19 06:46
class-wp-site.php	7.28 KB	-rw-r--r--	2022-09-13 04:17
class-wp-styles.php	10.64 KB	-rw-r--r--	2022-09-29 03:29
class-wp-tax-query.php	19.06 KB	-rw-r--r--	2022-11-24 11:00
class-wp-taxonomy.php	18.03 KB	-rw-r--r--	2022-11-26 23:09
class-wp-term-query.php	39.48 KB	-rw-r--r--	2023-01-18 23:28
class-wp-term.php	5.17 KB	-rw-r--r--	2022-09-13 04:17
class-wp-text-diff-renderer-inline.php	830 B	-rw-r--r--	2023-01-31 04:54
class-wp-text-diff-renderer-table.php	16.76 KB	-rw-r--r--	2023-02-08 06:40
class-wp-textdomain-registry.php	5.83 KB	-rw-r--r--	2023-02-16 12:26
class-wp-theme-json-data.php	1.52 KB	-rw-r--r--	2022-10-12 03:30
class-wp-theme-json-resolver.php	23.41 KB	-rw-r--r--	2023-03-02 05:47
class-wp-theme-json-schema.php	4.22 KB	-rw-r--r--	2022-09-13 04:17
class-wp-theme-json.php	116.44 KB	-rw-r--r--	2023-05-30 12:14
class-wp-theme.php	54.98 KB	-rw-r--r--	2023-10-17 05:25
class-wp-user-meta-session-tokens.php	2.92 KB	-rw-r--r--	2019-01-09 18:34
class-wp-user-query.php	38.89 KB	-rw-r--r--	2022-11-09 07:01
class-wp-user-request.php	2.17 KB	-rw-r--r--	2022-09-13 04:17
class-wp-user.php	22.23 KB	-rw-r--r--	2022-11-30 05:21
class-wp-walker.php	12.86 KB	-rw-r--r--	2022-09-13 04:17
class-wp-widget-factory.php	3.27 KB	-rw-r--r--	2022-09-13 04:17
class-wp-widget.php	17.95 KB	-rw-r--r--	2023-02-22 06:09
class-wp-xmlrpc-server.php	208.55 KB	-rw-r--r--	2023-02-20 04:35
class-wp.php	25.39 KB	-rw-r--r--	2022-10-19 04:41
class-wpdb.php	116.29 KB	-rw-r--r--	2023-03-01 02:18
class.wp-dependencies.php	373 B	-rw-r--r--	2022-09-21 02:47
class.wp-scripts.php	343 B	-rw-r--r--	2022-09-21 02:47
class.wp-styles.php	338 B	-rw-r--r--	2022-09-21 02:47
comment-template.php	97.57 KB	-rw-r--r--	2023-05-30 12:14
comment.php	125.63 KB	-rw-r--r--	2025-10-17 03:27
compat.php	15 KB	-rw-r--r--	2025-10-17 03:27
cron.php	40.56 KB	-rw-r--r--	2026-02-14 18:33
date.php	400 B	-rw-r--r--	2022-06-17 23:50
default-constants.php	10.29 KB	-rw-r--r--	2022-09-20 14:06
default-filters.php	30.85 KB	-rw-r--r--	2023-02-03 13:45
default-widgets.php	2.17 KB	-rw-r--r--	2021-05-25 20:57
deprecated.php	133.95 KB	-rw-r--r--	2023-03-01 04:37
embed-template.php	338 B	-rw-r--r--	2022-06-17 23:50
embed.php	36.58 KB	-rw-r--r--	2022-08-20 10:36
error-protection.php	4.02 KB	-rw-r--r--	2022-04-30 07:47
feed-atom-comments.php	5.32 KB	-rw-r--r--	2022-11-27 10:31
feed-atom.php	2.98 KB	-rw-r--r--	2021-11-29 23:22
feed-rdf.php	2.61 KB	-rw-r--r--	2020-01-29 14:15
feed-rss.php	1.16 KB	-rw-r--r--	2020-01-29 14:15
feed-rss2-comments.php	3.98 KB	-rw-r--r--	2023-02-13 07:38
feed-rss2.php	3.71 KB	-rw-r--r--	2020-01-29 14:15
feed.php	22.46 KB	-rw-r--r--	2025-10-17 03:27
fonts.php	0 B	-rw-r--r--	2025-10-17 03:27
formatting.php	325.36 KB	-rw-r--r--	2025-10-17 03:27
functions.php	255.56 KB	-r--r--r--	2026-02-14 18:33
functions.wp-scripts.php	13.2 KB	-rw-r--r--	2023-01-16 04:27
functions.wp-styles.php	8.38 KB	-rw-r--r--	2023-01-16 04:27
general-template.php	163.92 KB	-rw-r--r--	2026-02-14 18:33
global-styles-and-settings.php	13.86 KB	-rw-r--r--	2023-02-03 08:22
http.php	22.62 KB	-rw-r--r--	2025-10-17 03:27
https-detection.php	6.7 KB	-rw-r--r--	2022-08-12 02:41
https-migration.php	4.62 KB	-rw-r--r--	2021-02-02 13:40
kses.php	69.6 KB	-rw-r--r--	2023-02-13 22:17
l10n.php	60.47 KB	-rw-r--r--	2025-10-17 03:27
link-template.php	150.32 KB	-rw-r--r--	2023-03-09 03:06
load.php	50.37 KB	-rw-r--r--	2025-10-17 03:27
locale.php	162 B	-rw-r--r--	2019-10-09 05:49
media-template.php	59.9 KB	-rw-r--r--	2023-03-07 18:17
media.php	188.81 KB	-rw-r--r--	2025-10-17 03:27
meta.php	61.72 KB	-rw-r--r--	2023-02-22 06:09
ms-blogs.php	24.93 KB	-rw-r--r--	2023-02-24 14:53
ms-default-constants.php	4.78 KB	-rw-r--r--	2022-07-15 02:05
ms-default-filters.php	6.48 KB	-rw-r--r--	2023-02-24 14:53
ms-deprecated.php	21.25 KB	-rw-r--r--	2022-12-10 01:24
ms-files.php	2.59 KB	-rw-r--r--	2021-07-07 08:51
ms-functions.php	89.14 KB	-rw-r--r--	2023-02-22 06:09
ms-load.php	19.38 KB	-rw-r--r--	2023-02-24 00:08
ms-network.php	3.71 KB	-rw-r--r--	2022-10-19 06:46
ms-settings.php	4.03 KB	-rw-r--r--	2020-05-17 07:12
ms-site.php	39.13 KB	-rw-r--r--	2022-12-08 10:49
nav-menu-template.php	25.18 KB	-rw-r--r--	2023-02-16 13:34
nav-menu.php	42.21 KB	-rw-r--r--	2025-10-17 03:27
option.php	77.86 KB	-rw-r--r--	2023-02-08 02:19
pluggable-deprecated.php	6.12 KB	-rw-r--r--	2020-01-12 08:02
pluggable.php	108.27 KB	-rw-r--r--	2025-10-17 03:27
plugin.php	35.15 KB	-r--r--r--	2026-02-14 18:33
post-formats.php	6.93 KB	-rw-r--r--	2023-02-22 06:09
post-template.php	65.28 KB	-rw-r--r--	2023-02-08 04:05
post-thumbnail-template.php	10.75 KB	-rw-r--r--	2023-01-19 21:04
post.php	268.82 KB	-rw-r--r--	2025-10-17 03:27
query.php	36.13 KB	-rw-r--r--	2025-10-17 03:27
registration-functions.php	200 B	-rw-r--r--	2020-11-13 00:47
registration.php	200 B	-rw-r--r--	2020-11-13 00:47
rest-api.php	94.47 KB	-rw-r--r--	2025-10-17 03:27
revision.php	24.82 KB	-rw-r--r--	2025-10-17 03:27
rewrite.php	19.04 KB	-rw-r--r--	2022-12-16 00:33
robots-template.php	5.06 KB	-rw-r--r--	2022-04-07 04:03
rss-functions.php	255 B	-rw-r--r--	2020-11-17 12:22
rss.php	22.46 KB	-rw-r--r--	2023-02-22 06:09
script-loader.php	133.74 KB	-rw-r--r--	2023-05-30 12:14
session.php	258 B	-rw-r--r--	2020-02-06 20:03
shortcodes.php	21.86 KB	-rw-r--r--	2023-10-17 05:25
sitemaps.php	3.16 KB	-rw-r--r--	2025-10-17 03:27
spl-autoload-compat.php	441 B	-rw-r--r--	2020-11-13 00:47
style-engine.php	6.25 KB	-rw-r--r--	2025-10-17 03:27
taxonomy.php	168.15 KB	-rw-r--r--	2025-10-17 03:27
template-canvas.php	592 B	-rw-r--r--	2021-12-11 10:00
template-loader.php	2.94 KB	-rw-r--r--	2026-02-14 18:33
template.php	22.77 KB	-rw-r--r--	2022-12-23 00:38
theme-i18n.json	1.12 KB	-rw-r--r--	2022-09-22 00:13
theme-templates.php	5.38 KB	-rw-r--r--	2023-02-20 04:35
theme.json	9.81 KB	-rw-r--r--	2023-02-23 05:30
theme.php	126.88 KB	-rw-r--r--	2025-10-17 03:27
update.php	33.86 KB	-rw-r--r--	2025-10-17 03:27
user.php	165.74 KB	-rw-r--r--	2025-10-17 03:27
vars.php	5.74 KB	-rw-r--r--	2025-10-17 03:27
version.php	929 B	-rw-r--r--	2025-10-17 03:27
widgets.php	68.22 KB	-rw-r--r--	2025-10-17 03:27
wlwmanifest.xml	1.02 KB	-rw-r--r--	2013-12-12 09:19
wp-db.php	445 B	-rw-r--r--	2022-07-22 11:15
wp-diff.php	647 B	-rw-r--r--	2020-02-06 20:03

Rename

<?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;
		}

$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 = '';

// 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 ) {
		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 = 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 = 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 ] );
	}

}