New plugin hooks in WordPress 5.5

Important! Some WordPress hooks get applied in multiple PHP files. If you are trying to figure out what a specific WordPress hook does, sort the table by "hook" and make sure you are looking in all the files where it occurs.

• To sort the table, click on a column title.
• Click a hook name to see details about the hook.
• Click a file name to see only hooks used in that file.

	Hook		Type	New?	Instances
1	admin_viewport_meta		filter	YES	1
2	akismet_enable_mshots		filter	YES	1
3	allowed_options		filter	YES	1
4	auto_plugin_theme_update_email		filter	YES	1
5	auto_plugin_update_send_email		filter	YES	1
6	auto_theme_update_send_email		filter	YES	1
7	customize_controls_head		action	YES	1
8	default_category_post_types		filter	YES	1
9	default_{$meta_type}_metadata	note	filter	YES	1
10	do_redirect_guess_404_permalink		filter	YES	1
11	esc_xml		filter	YES	1
12	gettext_with_context_{$domain}	note	filter	YES	1
13	gettext_{$domain}	note	filter	YES	1
14	get_custom_logo_image_attributes		filter	YES	1
15	get_page_of_comment_query_args		filter	YES	1
16	get_the_archive_title_prefix		filter	YES	1
17	install_plugin_overwrite_actions		filter	YES	1
18	install_plugin_overwrite_comparison		filter	YES	1
19	install_theme_overwrite_actions		filter	YES	1
20	install_theme_overwrite_comparison		filter	YES	1
21	lostpassword_errors		filter	YES	1
22	navigation_widgets_format		filter	YES	1
23	ngettext_with_context_{$domain}	note	filter	YES	1
24	ngettext_{$domain}	note	filter	YES	1
25	plugins_auto_update_enabled		filter	YES	1
26	plugin_auto_update_debug_string		filter	YES	1
27	plugin_auto_update_setting_html		filter	YES	1
28	pre_delete_attachment		filter	YES	1
29	pre_redirect_guess_404_permalink		filter	YES	1
30	pre_wp_unique_filename_file_list		filter	YES	1
31	register_block_type_args		filter	YES	1
32	register_setting		action	YES	1
33	render_block_context		filter	YES	1
34	rest_allowed_cors_headers		filter	YES	1
35	rest_block_directory_collection_params		filter	YES	1
36	rest_exposed_cors_headers		filter	YES	1
37	rest_prepare_block_type		filter	YES	1
38	rest_prepare_plugin		filter	YES	1
39	rest_queried_resource_route		filter	YES	1
40	rest_route_for_post		filter	YES	1
41	rest_route_for_term		filter	YES	1
42	safecss_filter_attr_allow_css		filter	YES	1
43	saved_term		action	YES	1
44	saved_{$taxonomy}	note	action	YES	1
45	set_404		action	YES	1
46	set_screen_option_{$option}	note	filter	YES	1
47	strict_redirect_guess_404_permalink		filter	YES	1
48	themes_auto_update_enabled		filter	YES	1
49	theme_auto_update_debug_string		filter	YES	1
50	theme_auto_update_setting_html		filter	YES	1
51	theme_auto_update_setting_template		filter	YES	1
52	twentytwenty_social_icons_map		filter	YES	1
53	twentytwenty_svg_icons_social		filter	YES	1
54	twentytwenty_svg_icons_{$group}	note	filter	YES	1
55	twentytwenty_svg_icon_color		filter	YES	1
56	unregister_setting		action	YES	1
57	upgrader_overwrote_package		action	YES	1
58	wp_check_comment_disallowed_list		action	YES	1
59	wp_edited_image_metadata		filter	YES	1
60	wp_image_file_matches_image_meta		filter	YES	1
61	wp_img_tag_add_loading_attr		filter	YES	1
62	wp_img_tag_add_srcset_and_sizes_attr		filter	YES	1
63	wp_img_tag_add_width_and_height_attr		filter	YES	1
64	wp_lazy_loading_enabled		filter	YES	1
65	wp_media_attach_action		action	YES	1
66	wp_opcache_invalidate_file		filter	YES	1
67	wp_sitemaps_add_provider		filter	YES	1
68	wp_sitemaps_enabled		filter	YES	1
69	wp_sitemaps_index_entry		filter	YES	1
70	wp_sitemaps_init		action	YES	1
71	wp_sitemaps_max_urls		filter	YES	1
72	wp_sitemaps_posts_entry		filter	YES	1
73	wp_sitemaps_posts_pre_max_num_pages		filter	YES	1
74	wp_sitemaps_posts_pre_url_list		filter	YES	1
75	wp_sitemaps_posts_query_args		filter	YES	1
76	wp_sitemaps_posts_show_on_front_entry		filter	YES	1
77	wp_sitemaps_post_types		filter	YES	1
78	wp_sitemaps_stylesheet_content		filter	YES	1
79	wp_sitemaps_stylesheet_css		filter	YES	1
80	wp_sitemaps_stylesheet_index_content		filter	YES	1
81	wp_sitemaps_stylesheet_index_url		filter	YES	1
82	wp_sitemaps_stylesheet_url		filter	YES	1
83	wp_sitemaps_taxonomies		filter	YES	1
84	wp_sitemaps_taxonomies_entry		filter	YES	1
85	wp_sitemaps_taxonomies_pre_max_num_pages		filter	YES	1
86	wp_sitemaps_taxonomies_pre_url_list		filter	YES	1
87	wp_sitemaps_taxonomies_query_args		filter	YES	1
88	wp_sitemaps_users_entry		filter	YES	1
89	wp_sitemaps_users_pre_max_num_pages		filter	YES	1
90	wp_sitemaps_users_pre_url_list		filter	YES	1
91	wp_sitemaps_users_query_args		filter	YES	1
92	wp_update_comment_type_batch_size		filter	YES	1

Important warning about variable hooks

Some hooks have variables in their names. For example, pre_${taxonomy}_$field and admin_head- both have variable names. In general, any hook that ends (or begins) with - or _, or contains a $, has a variable name. Since the syntax with which these variables are defined may change from version to version, this page may think that a hook is deprecated (or new) even if it is not. You can usually catch this sort of thing by comparing this hook to the list of "related hooks" below.