New plugin hooks in WordPress 2.1

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	add_category_form_pre		action	YES	1
2	admin_head-{$page_hook}	note	action	YES	1
3	admin_head-{$plugin_page}	note	action	YES	1
4	admin_print_scripts		action	YES	1
5	admin_print_scripts-{$page_hook}	note	action	YES	1
6	admin_print_scripts-{$plugin_page}	note	action	YES	1
7	autosave_interval		filter	YES	1
8	bloginfo_rss		filter	YES	1
9	blog_privacy_selector		action	YES	1
10	cat_id_filter		filter	YES	1
11	cat_rows		filter	YES	1
12	check_ajax_referer		action	YES	1
13	commentrss2_item		action	YES	1
14	comments_array		filter	YES	1
15	comment_flood_filter		filter	YES	1
16	cron_schedules		filter	YES	1
17	do_robots		action	YES	1
18	do_robotstxt		action	YES	1
19	edit_category_form		action	YES	1
20	edit_category_form_pre		action	YES	1
21	explain_nonce_{$verb}-{$noun}	note	filter	YES	1
22	found_posts		filter	YES	1
23	found_posts_query		filter	YES	1
24	get_attached_file		filter	YES	1
25	get_bookmarks		filter	YES	1
26	get_categories		filter	YES	1
27	get_footer		action	YES	1
28	get_header		action	YES	1
29	get_next_post_join		filter	YES	1
30	get_next_post_sort		filter	YES	1
31	get_next_post_where		filter	YES	1
32	get_pages		filter	YES	1
33	get_previous_post_join		filter	YES	1
34	get_previous_post_sort		filter	YES	1
35	get_previous_post_where		filter	YES	1
36	get_the_modified_date		filter	YES	1
37	load-{$pagenow}	note	action	YES	1
38	load-{$page_hook}	note	action	YES	1
39	load-{$plugin_page}	note	action	YES	1
40	locale_stylesheet_uri		filter	YES	1
41	login_errors		filter	YES	1
42	login_form		action	YES	1
43	login_head		action	YES	1
44	login_headertitle		filter	YES	1
45	login_headerurl		filter	YES	1
46	login_message		filter	YES	1
47	lostpassword_form		action	YES	1
48	lostpassword_post		action	YES	1
49	manage_link_columns		filter	YES	1
50	manage_link_custom_column		action	YES	1
51	mce_css		filter	YES	1
52	parse_request		action	YES	1
53	postmeta_form_limit		filter	YES	1
54	posts_distinct		filter	YES	1
55	posts_fields		filter	YES	1
56	post_limits		filter	YES	1
57	preview_page_link		filter	YES	1
58	pre_upload_error		filter	YES	1
59	publish_page		action	YES	1
60	register_form		action	YES	1
61	register_post		action	YES	1
62	registration_errors		filter	YES	1
63	request		filter	YES	1
64	restrict_manage_posts		action	YES	1
65	send_headers		action	YES	1
66	the_editor		filter	YES	1
67	the_editor_content		filter	YES	1
68	the_modified_date		filter	YES	1
69	tiny_mce_config_url		filter	YES	1
70	update_attached_file		filter	YES	1
71	upload_files_{$tab}	note	action	YES	1
72	user_can_richedit		filter	YES	1
73	user_registration_email		filter	YES	1
74	wp		action	YES	1
75	wp_ajax_{$action}	note	action	YES	1
76	wp_create_file_in_uploads		filter	YES	1
77	wp_create_thumbnail		filter	YES	1
78	wp_delete_file		filter	YES	1
79	wp_dropdown_cats		filter	YES	1
80	wp_dropdown_pages		filter	YES	1
81	wp_generate_attachment_metadata		filter	YES	1
82	wp_get_attachment_metadata		filter	YES	1
83	wp_get_attachment_thumb_file		filter	YES	1
84	wp_get_attachment_thumb_url		filter	YES	1
85	wp_get_attachment_url		filter	YES	1
86	wp_handle_upload		filter	YES	1
87	wp_list_categories		filter	YES	1
88	wp_list_pages_excludes		filter	YES	1
89	wp_mime_type_icon		filter	YES	1
90	wp_print_scripts		action	YES	1
91	wp_redirect		filter	YES	1
92	wp_thumbnail_creation_size_limit		filter	YES	1
93	wp_thumbnail_max_side_length		filter	YES	1
94	wp_update_attachment_metadata		filter	YES	1
95	wp_upload_tabs		filter	YES	1
96	xmlrpc_publish_post		action	YES	1
97	_get_page_link		filter	YES	1
98	{$hook}	note	action	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.