New plugin hooks in WordPress 4.9

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_referrer_policy		filter	YES	1
2	akismet_predefined_api_key		filter	YES	1
3	alloptions		filter	YES	1
4	available_permalink_structure_tags		filter	YES	1
5	can_add_user_to_blog		filter	YES	1
6	clean_taxonomy_cache		action	YES	1
7	core_version_check_query_args		filter	YES	1
8	customize_changeset_branching		filter	YES	1
9	customize_load_themes		filter	YES	1
10	embed_thumbnail_id		filter	YES	1
11	get_the_post_type_description		filter	YES	1
12	login_link_separator		filter	YES	1
13	login_title		filter	YES	1
14	loop_no_results		action	YES	1
15	manage_users_extra_tablenav		action	YES	1
16	network_admin_email_change_email		filter	YES	1
17	new_network_admin_email_content		filter	YES	1
18	page_attributes_misc_attributes		action	YES	1
19	plugin_files_exclusions		filter	YES	1
20	pre_cache_alloptions		filter	YES	1
21	pre_get_main_site_id		filter	YES	1
22	pre_move_uploaded_file		filter	YES	1
23	pre_term_link		filter	YES	1
24	pre_trash_post		filter	YES	1
25	pre_untrash_post		filter	YES	1
26	replace_editor		filter	YES	1
27	rest_pre_echo_response		filter	YES	1
28	self_admin_url		filter	YES	1
29	send_network_admin_email_change_email		filter	YES	1
30	send_site_admin_email_change_email		filter	YES	1
31	site_admin_email_change_email		filter	YES	1
32	username_exists		filter	YES	1
33	widget_custom_html_content		filter	YES	1
34	widget_{$this->id_base}_instance_schema	note	filter	YES	1
35	wp_code_editor_settings		filter	YES	1
36	wp_enqueue_code_editor		action	YES	1
37	wp_get_nav_menu_name		filter	YES	1
38	wp_get_object_terms_args		filter	YES	1
39	wp_is_mobile		filter	YES	1
40	wp_new_user_notification_email		filter	YES	1
41	wp_new_user_notification_email_admin		filter	YES	1
42	wp_password_change_notification_email		filter	YES	1
43	wp_pre_insert_user_data		filter	YES	1
44	wp_read_video_metadata		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.