WebDev -> WordPress -> Plugin Development: List of All Filters available

06.Jul.2015

Links

http://wordpress.stackexchange.com/questions/35931/how-can-i-edit-post-data-before-it-is-saved

Source: http://codex.wordpress.org/Plugin_API/Hooks

Plugin API/Filter Reference

This article contains an extensive (but not 100% comprehensive) list of the filter hooks available for use in plugin development in Version 2.1 and above of WordPress. For more information:

To learn more about what filter and action hooks are, see Plugin API.
To learn about writing plugins in general, see Writing a Plugin.
For a reference list of action hooks, see Plugin API/Action Reference.
For information about filter and action hooks in previous versions of WordPress, see Plugin API/Hooks 2.0.x.
For an automatically-generated list of all WordPress hooks, see the WordPress Hooks Database

Note: If you want to add to or clarify this documentation, please follow the style of the existing entries. Describe what data the filter is applied to, and if the filter function takes additional arguments, describe the argument list.

Post, Page, and Attachment (Upload) Filters

Database Reads

Filters in this section are applied to information read from the database, prior to displaying on a page or editing screen.

attachment_fields_to_edit: applied to the form fields to be displayed when editing an attachment. Called in the get_attachment_fields_to_edit function. Filter function arguments: an array of form fields, the post object.

attachment_icon: applied to the icon for an attachment in the get_attachment_icon function. Filter function arguments: icon file as an HTML IMG tag, attachment ID.

attachment_innerHTML: applied to the title to be used for an attachment if there is no icon, in the get_attachment_innerHTML function. Filter function arguments: inner HTML (defaults to the title), attachment ID.

author_edit_pre: applied to post author prior to display for editing.

body_class: applied to the classes for the HTML <body> element. Called in the get_body_class function. Filter function arguments: an array of class names and an array of additional class names that were added to the first array.

content_edit_pre: applied to post content prior to display for editing.

content_filtered_edit_pre: applied to post content filtered prior to display for editing.

excerpt_edit_pre: applied to post excerpt prior to display for editing.

date_edit_pre: applied to post date prior to display for editing.

date_gmt_edit_pre: applied to post date prior to display for editing.

get_attached_file: applied to the attached file information retrieved by the get_attached_file function. Filter function arguments: file information, attachment ID.

get_enclosed: applied to the enclosures list for a post by the get_enclosed function.

get_pages: applied to the list of pages returned by the get_pages function. Filter function arguments: list of pages (each item of which contains a page data array), get_pages function argument list (telling which pages were requested).

get_pung: applied to the list of pinged URLs for a post by the get_pung function.

get_the_archive_title: applied to the archive’s title in the get_the_archive_title function.

get_the_excerpt: applied to the post’s excerpt in the get_the_excerpt function.

get_the_guid: applied to the post’s GUID in the get_the_guid function.

get_to_ping: applied to the list of URLs to ping for a post by the get_to_ping function.

icon_dir: applied to the template’s image directory in several functions. Basically allows a plugin to specify that icons for MIME types should come from a different location.

icon_dir_uri: applied to the template’s image directory URI in several functions. Basically allows a plugin to specify that icons for MIME types should come from a different location.

image_size_names_choose: applied to the list of image sizes selectable in the Media Library. Commonly used to make custom image sizes selectable.

mime_type_edit_pre: applied to post mime type prior to display for editing.

modified_edit_pre: applied to post modification date prior to display for editing.

modified_gmt_edit_pre: applied to post modification gmt date prior to display for editing.

no_texturize_shortcodes: applied to registered shortcodes. Can be used to exempt shortcodes from the automatic texturize function.

parent_edit_pre: applied to post parent id prior to display for editing.

password_edit_pre: applied to post password prior to display for editing.

post_class: applied to the classes of the outermost HTML element for a post. Called in the get_post_class function. Filter function arguments: an array of class names, an array of additional class names that were added to the first array, and the post ID.

prepend_attachment: applied to the HTML to be prepended by the prepend_attachment function.

protected_title_format: Used to the change or manipulate the post title when the post is password protected.

private_title_format: Used to the change or manipulate the post title when it’s status is private.
sanitize_title: applied to a post title by the sanitize_title function, after stripping out HTML tags.

single_post_title: applied to the post title when used to create a blog page title by the wp_title and single_post_title functions.

status_edit_pre: applied to post status prior to display for editing.

the_content: applied to the post content retrieved from the database, prior to printing on the screen (also used in some other operations, such as trackbacks).

the_content_rss: applied to the post content prior to including in an RSS feed. This filter hasn’t been functional since 2.7.

the_content_feed: applied to the post content prior to including in an RSS feed.

the_editor_content: applied to post content before putting it into a rich editor window.

the_excerpt: applied to the post excerpt (or post content, if there is no excerpt) retrieved from the database, prior to printing on the screen (also used in some other operations, such as trackbacks).

the_excerpt_rss: applied to the post excerpt prior to including in an RSS feed.

the_password_form: applied to the password form for protected posts.

the_tags: applied to the tags retrieved from the database, prior to printing on the screen.

the_title: applied to the post title retrieved from the database, prior to printing on the screen (also used in some other operations, such as trackbacks).

the_title_rss: applied to the post title before including in an RSS feed (after first filtering with the_title.

title_edit_pre: applied to post title prior to display for editing.

type_edit_pre: applied to post type prior to display for editing.

wp_dropdown_pages: applied to the HTML dropdown list of WordPress pages generated by the wp_dropdown_pages function.

wp_list_pages: applied to the HTML list generated by the wp_list_pages function.

wp_list_pages_excludes: applied to the list of excluded pages (an array of page IDs) in the wp_list_pages function.

wp_get_attachment_metadata: applied to the attachment metadata retrieved by the wp_get_attachment_metadata function. Filter function arguments: meta data, attachment ID.

wp_get_attachment_thumb_file: applied to the attachment thumbnail file retrieved by the wp_get_attachment_thumb_file function. Filter function arguments: thumbnail file, attachment ID.

wp_get_attachment_thumb_url: applied to the attachment thumbnail URL retrieved by the wp_get_attachment_thumb_URL function. Filter function arguments: thumbnail URL, attachment ID.

wp_get_attachment_url: applied to the attachment URL retrieved by the wp_get_attachment_url function. Filter function arguments: URL, attachment ID.

wp_mime_type_icon: applied to the MIME type icon for an attachment calculated by the wp_mime_type_icon function. Filter function arguments: icon URI calculated, MIME type, post ID.

wp_title: applied to the blog page title before sending to the browser in the wp_title function.

Database Writes

Filters in this section are applied to information prior to saving to the database.

add_ping: applied to the new value of the pinged field on a post when a ping is added, prior to saving the new information in the database.

attachment_fields_to_save: applied to fields associated with an attachment prior to saving them in the database. Called in the media_upload_form_handler function. Filter function arguments: an array of post attributes, an array of attachment fields including the changes submitted from the form.

attachment_max_dims: applied to the maximum image dimensions before reducing an image size. Filter function input (and return value) is either false (if no maximum dimensions have been specified) or a two-item list (width, height).

category_save_pre: applied to post category comma-separated list prior to saving it in the database (also used for attachments).

comment_status_pre: applied to post comment status prior to saving it in the database (also used for attachments).

content_filtered_save_pre: applied to filtered post content prior to saving it in the database (also used for attachments).

content_save_pre: applied to post content prior to saving it in the database (also used for attachments).

excerpt_save_pre: applied to post excerpt prior to saving it in the database (also used for attachments).

image_save_pre (deprecated): use image_editor_save_pre instead.

jpeg_quality (deprecated): use wp_editor_set_quality or WP_Image_Editor::set_quality() instead.

name_save_pre: applied to post name prior to saving it in the database (also used for attachments).

phone_content: applied to the content of a post submitted by email, before saving.

ping_status_pre: applied to post ping status prior to saving it in the database (also used for attachments).

post_mime_type_pre: applied to the MIME type for an attachment prior to saving it in the database.

status_save_pre: applied to post status prior to saving it in the database.

thumbnail_filename: applied to the file name for the thumbnail when uploading an image.

title_save_pre: applied to post title prior to saving it in the database (also used for attachments).

update_attached_file: applied to the attachment information prior to saving in post metadata in the update_attached_file function. Filter function arguments: attachment information, attachment ID.

wp_create_thumbnail (deprecated)

wp_delete_file: applied to an attachment file name just before deleting.

wp_generate_attachment_metadata: applied to the attachment metadata array before saving in the database.

wp_save_image_file (deprecated): use wp_save_image_editor_file instead.

wp_thumbnail_creation_size_limit: applied to the size of the thumbnail when uploading an image. Filter function arguments: max file size, attachment ID, attachment file name.

wp_thumbnail_max_side_length: applied to the size of the thumbnail when uploading an image. Filter function arguments: image side max size, attachment ID, attachment file name.

wp_update_attachment_metadata: applied to the attachment metadata just before saving in the wp_update_attachment_metadata function. Filter function arguments: meta data, attachment ID.

Comment, Trackback, and Ping Filters

Database Reads

Filters in this section are applied to information read from the database, prior to displaying on a page or editing screen.

comment_excerpt: applied to the comment excerpt by the comment_excerpt function. See also get_comment_excerpt.

comment_flood_filter: applied when someone appears to be flooding your blog with comments. Filter function arguments: already blocked (true/false, whether a previous filtering plugin has already blocked it; set to true and return true to block this comment in a plugin), time of previous comment, time of current comment.

comment_post_redirect: applied to the redirect location after someone adds a comment. Filter function arguments: redirect location, comment info array.

comment_text: applied to the comment text before displaying on the screen by the comment_text function, and in the admin menus.

comment_text_rss: applied to the comment text prior to including in an RSS feed.

comments_array: applied to the array of comments for a post in the comments_template function. Filter function arguments: array of comment information structures, post ID.

comments_number: applied to the formatted text giving the number of comments generated by the comments_number function. See also get_comments_number.

get_comment_excerpt: applied to the comment excerpt read from the database by the get_comment_excerpt function (which is also called by comment_excerpt. See also comment_excerpt.

get_comment_ID: applied to the comment ID read from the global $comments variable by the get_comment_ID function.

get_comment_text: applied to the comment text of the current comment in the get_comment_text function, which is also called by the comment_text function.

get_comment_type: applied to the comment type (“comment”, “trackback”, or “pingback”) by the get_comment_type function (which is also called by comment_type).

get_comments_number: applied to the comment count read from the $post global variable by the get_comments_number function (which is also called by the comments_number function; see also comments_number filter).

post_comments_feed_link: applied to the feed URL generated for the comments feed by the comments_rss function.

Database Writes

Filters in this section are applied to information prior to saving to the database.

comment_save_pre: applied to the comment data just prior to updating/editing comment data. Function arguments: comment data array, with indices “comment_post_ID”, “comment_author”, “comment_author_email”, “comment_author_url”, “comment_content”, “comment_type”, and “user_ID”.

pre_comment_approved: applied to the current comment’s approval status (true/false) to allow a plugin to override. Return true/false and set first argument to true/false to approve/disapprove the comment, and use global variables such as $comment_ID to access information about this comment.

pre_comment_content: applied to the content of a comment prior to saving the comment in the database.

preprocess_comment: applied to the comment data prior to any other processing, when saving a new comment in the database. Function arguments: comment data array, with indices “comment_post_ID”, “comment_author”, “comment_author_email”, “comment_author_url”, “comment_content”, “comment_type”, and “user_ID”.

wp_insert_post_data: applied to modified and unmodified post data in wp_insert_post() prior to update or insertion of post into database. Function arguments: modified and extended post array and sanitized post array.

Category and Term Filters

Database Reads

Filters in this section are applied to information read from the database, prior to displaying on a page or editing screen.

category_description: applied to the “description” field categories by the category_description and wp_list_categories functions. Filter function arguments: description, category ID when called from category_description; description, category information array (all fields from the category table for that particular category) when called from wp_list_categories.

category_feed_link: applied to the feed URL generated for the category feed by the get_category_feed_link function.

category_link: applied to the URL created for a category by the get_category_link function. Filter function arguments: link URL, category ID.

get_ancestors: applied to the list of ancestor IDs returned by the get_ancestors function (which is in turn used by many other functions). Filter function arguments: ancestor IDs array, given object ID, given object type.

get_categories: applied to the category list generated by the get_categories function (which is in turn used by many other functions). Filter function arguments: category list, get_categories options list.

get_category: applied to the category information that the get_category function looks up, which is basically an array of all the fields in WordPress’s category table for a particular category ID.

list_cats: called for two different purposes:

the wp_dropdown_categories function uses it to filter the show_option_all and show_option_none arguments (which are used to put options “All” and “None” in category drop-down lists). No additional filter function arguments.
the wp_list_categories function applies it to the category names. Filter function arguments: category name, category information list (all fields from the category table for that particular category).

list_cats_exclusions: applied to the SQL WHERE statement giving the categories to be excluded by the get_categories function. Typically, a plugin would add to this list, in order to exclude certain categories or groups of categories from category lists. Filter function arguments: excluded category WHERE clause, get_categories options list.

single_cat_title: applied to the category name when used to create a blog page title by the wp_title and single_cat_title functions.

the_category: applied to the list of categories (an HTML list with links) created by the get_the_category_list function. Filter function arguments: generated HTML text, list separator being used (empty string means it is a default LI list), parents argument to get_the_category_list.

the_category_rss: applied to the category list (a list of category XML elements) for a post by the get_the_category_rss function, before including in an RSS feed. Filter function arguments are the list text and the type (“rdf” or “rss” generally).

wp_dropdown_cats: applied to the drop-down category list (a text string containing HTML option elements) generated by the wp_dropdown_categories function.

wp_list_categories: applied to the category list (an HTML list) generated by the wp_list_categories function.

wp_get_object_terms: applied to the list of terms (an array of objects) generated by the wp_get_object_terms function, which is called by a number of category/term related functions, such as get_the_terms and get_the_category.

Database Writes

Filters in this section are applied to information prior to saving to the database.

pre_category_description: applied to the category desription prior to saving in the database.

wp_update_term_parent: filter term parent before update to term is applied, hook to this filter to see if it will cause a hierarchy loop.

edit_terms: (actually an action, but often used like a filter) hooked in prior to saving taxonomy/category change in the database

pre_category_name: applied to the category name prior to saving in the database.

pre_category_nicename: applied to the category nice name prior to saving in the database.

Link Filters

Note: This section contains filters related to links to posts, pages, archives, feeds, etc. For blogroll links, see the #Blogroll Filters section below.

attachment_link: applied to the calculated attachment permalink by the get_attachment_link function. Filter function arguments: link URL, attachment ID.

author_feed_link: applied to the feed URL generated for the author feed by the get_author_rss_link function.

author_link: applied to the author’s archive permalink created by the get_author_posts_url function. Filter function arguments: link URL, author ID, author’s “nice” name. Note that get_author_posts_url is called within functions wp_list_authors and the_author_posts_link.

comment_reply_link: applied to the link generated for replying to a specific comment by the get_comment_reply_link function which is called within function comments_template. Filter function arguments: link (string), custom options (array), current comment (object), current post (object).

day_link: applied to the link URL for a daily archive by the get_day_link function. Filter function arguments: URL, year, month number, day number.

feed_link: applied to the link URL for a feed by the get_feed_link function. Filter function arguments: URL, type of feed (e.g. “rss2”, “atom”, etc.).

get_comment_author_link: applied to the HTML generated for the author’s link on a comment, in the get_comment_author_link function (which is also called by comment_author_link. Action function arguments: user name

get_comment_author_url_link: applied to the HTML generated for the author’s link on a comment, in the get_comment_author_url_link function (which is also called by comment_author_link).

month_link: applied to the link URL for a monthly archive by the get_month_link function. Filter function arguments: URL, year, month number.

page_link: applied to the calculated page URL by the get_page_link function. Filter function arguments: URL, page ID. Note that there is also an internal filter called _get_page_link that can be used to filter the URLS of pages that are not designated as the blog’s home page (same arguments). Note that this only applies to WordPress pages, not posts, custom post types, or attachments.

post_link: applied to the calculated post permalink by the get_permalink function, which is also called by the the_permalink, post_permalink, previous_post_link, and next_post_link functions. Filter function arguments: permalink URL, post data list. Note that this only applies to WordPress default posts, and not custom post types (nor pages or attachments).

post_type_link: applied to the calculated custom post type permalink by the get_post_permalink function.

the_permalink: applied to the permalink URL for a post prior to printing by function the_permalink.

year_link: applied to the link URL for a yearly archive by the get_year_link function. Filter function arguments: URL, year.

tag_link: applied to the URL created for a tag by the get_tag_link function. Filter function arguments: link URL, tag ID.

term_link: applied to the URL created for a term by the get_term_link function. Filter function arguments: term link URL, term object and taxonomy slug.

Date and Time Filters

Author and User Filters

See also #Link Filters and #Administrative Filters sections.

login_body_class: Allows filtering of the body class applied to the login screen in login_header().

login_redirect: applied to the redirect_to post/get variable during the user login process.

user_contactmethods: applied to the contact methods fields on the user profile page. (old page is here: contactmethods)

update_(meta_type)_metadata: applied before a (user) metadata gets updated.

Database Reads

Filters in this section are applied to information read from the database, prior to displaying on a page or editing screen.

author_email: applied to the comment author’s email address retrieved from the database by the comment_author_email function. See also get_comment_author_email.

comment_author: applied to the comment author’s name retrieved from the database by the comment_author function. See also get_comment_author.
comment_author_rss: applied to the comment author’s name prior to including in an RSS feed.

comment_email: applied to the comment author’s email address retrieved from the database by the comment_author_email_link function.

comment_url: applied to the comment author’s URL retrieved from the database by the comment_author_url function (see also get_comment_author_url).

get_comment_author: applied to the comment author’s name retrieved from the database by get_comment_author, which is also called by comment_author. See also comment_author.

get_comment_author_email: applied to the comment author’s email address retrieved from the database by get_comment_author_email, which is also called by comment_author_email. See also author_email.

get_comment_author_IP: applied to the comment author’s IP address retrieved from the database by the get_comment_author_IP function, which is also called by comment_author_IP.

get_comment_author_url: applied to the comment author’s URL retrieved from the database by the get_comment_author_url function, which is also called by comment_author_url. See also comment_url.

login_errors: applied to the login error message printed on the login screen.

login_headertitle: applied to the title for the login header URL (Powered by WordPress by default) printed on the login screen.

login_headerurl: applied to the login header URL (points to wordpress.org by default) printed on the login screen.

login_message: applied to the login message printed on the login screen.

role_has_cap: applied to a role’s capabilities list in the WP_Role->has_cap function. Filter function arguments are the capabilities list to be filtered, the capability being questioned, and the role’s name.

sanitize_user: applied to a user name by the sanitize_user function. Filter function arguments: user name (after some cleaning up), raw user name, strict (true or false to use strict ASCII or not).

the_author: applied to a post author’s displayed name by the get_the_author function, which is also called by the the_author function.

the_author_email: applied to a post author’s email address by the the_author_email function.

user_search_columns: applied to the list of columns in the wp_users table to include in the WHERE clause inside WP_User_Query.

Database Writes

Filters in this section are applied to information prior to saving to the database.

pre_comment_author_email: applied to a comment author’s email address prior to saving the comment in the database.

pre_comment_author_name: applied to a comment author’s user name prior to saving the comment in the database.

pre_comment_author_url: applied to a comment author’s URL prior to saving the comment in the database.

pre_comment_user_agent: applied to the comment author’s user agent prior to saving the comment in the database.

pre_comment_user_ip: applied to the comment author’s IP address prior to saving the comment in the database.

pre_user_id: applied to the comment author’s user ID prior to saving the comment in the database.

pre_user_description: applied to the user’s description prior to saving in the database.

pre_user_display_name: applied to the user’s displayed name prior to saving in the database.

pre_user_email: applied to the user’s email address prior to saving in the database.

pre_user_first_name: applied to the user’s first name prior to saving in the database.

pre_user_last_name: applied to the user’s last name prior to saving in the database.

pre_user_login: applied to the user’s login name prior to saving in the database.

pre_user_nicename: applied to the user’s “nice name” prior to saving in the database.

pre_user_nickname: applied to the user’s nickname prior to saving in the database.

pre_user_url: applied to the user’s URL prior to saving in the database.

registration_errors: applied to the list of registration errors generated while registering a user for a new account.

user_registration_email: applied to the user’s email address read from the registration page, prior to trying to register the person as a new user.

validate_username: applied to the validation result on a new user name. Filter function arguments: valid (true/false), user name being validated.

Blog Information and Option Filters

all_options: applied to the option list retrieved from the database by the get_alloptions function.

bloginfo: applied to the blog option information retrieved from the database by the bloginfo function, after first retrieving the information with the get_bloginfo function. A second argument $show gives the name of the bloginfo option that was requested. Note that bloginfo("url"), bloginfo("directory") and bloginfo("home") do not use this filtering function (see bloginfo_url).

bloginfo_rss: applied to the blog option information by function get_bloginfo_rss (which is also called from bloginfo_rss), after first retrieving the information with the get_bloginfo function, stripping out HTML tags, and converting characters appropriately. A second argument $show gives the name of the bloginfo option that was requested.

bloginfo_url: applied to the the output of bloginfo("url"), bloginfo("directory") and bloginfo("home") before returning the information.

loginout: applied to the HTML link for logging in and out (generally placed in the sidebar) generated by the wp_loginout function.

option_(option name): applied to the option value retrieved from the database by the get_option function, after unserializing (which decodes array-based options). To use this filter, you will need to add filters for specific options names, such as “option_foo” to filter the output of get_option("foo").

pre_get_space_used: applied to the get_space_used() function to provide an alternative way of displaying storage space used. Returning false from this filter will revert to default display behavior (used wp_upload_dir() directory space in megabytes).

pre_option_(option name): applied to the option value retrieved from the database by the get_alloptions function, after unserializing (which decodes array-based options). To use this filter, you will need to add filters for specific options names, such as “pre_option_foo” to filter the option “foo”.

pre_update_option_(option name): applied the option value before being saving to the database to allow overriding the value to be stored. To use this filter, you will need to add filters for specific options names, such as “pre_update_option_foo” to filter the option “foo”.

register: applied to the sidebar link created for the user to register (if allowed) or visit the admin panels (if already logged in) by the wp_register function.

upload_dir: applied to the directory to be used for uploads calculated by the wp_upload_dir function. Filter function argument is an array with components “dir” (the upload directory path), “url” (the URL of the upload directory), and “error” (which you can set to true if you want to generate an error).

upload_mimes: allows a filter function to return a list of MIME types for uploads, if there is no MIME list input to the wp_check_filetype function. Filter function argument is an associated list of MIME types whose component names are file extensions (separated by vertical bars) and values are the corresponding MIME types.

General Text Filters

attribute_escape: applied to post text and other content by the attribute_escape function, which is called in many places in WordPress to change certain characters into HTML attributes before sending to the browser.

js_escape: applied to JavaScript code before sending to the browser in the js_escape function.

Administrative Filters

The filters in this section are related to the administration screens of WordPress, including content editing screens.

admin_user_info_links: applied to the user profile and info links in the WordPress admin quick menu.

autosave_interval: applied to the interval for auto-saving posts.

bulk_actions: applied to an array of bulk items in admin bulk action dropdowns.

bulk_post_updated_messages: applied to an array of bulk action updated messages.

cat_rows: applied to the category rows HTML generated for managing categories in the admin menus.

comment_edit_pre: applied to comment content prior to display in the editing screen.

comment_edit_redirect: applied to the redirect location after someone edits a comment in the admin menus. Filter function arguments: redirect location, comment ID.

comment_moderation_subject: applied to the mail subject before sending email notifying the administrator of the need to moderate a new comment. Filter function arguments: mail subject, comment ID. Note that this happens inside the default wp_notify_moderator function, which is a “pluggable” function, meaning that plugins can override it; see Plugin API).

comment_moderation_text: applied to the body of the mail message before sending email notifying the administrator of the need to moderate a new comment. Filter function arguments: mail body text, comment ID. Note that this happens inside the default wp_notify_moderator function, which is a “pluggable” function, meaning that plugins can override it; see Plugin API).

comment_notification_headers: applied to the mail headers before sending email notifying the post author of a new comment. Filter function arguments: mail header text, comment ID. Note that this happens inside the default wp_notify_postauthor function, which is a “pluggable” function, meaning that plugins can override it; see Plugin API).

comment_notification_subject: applied to the mail subject before sending email notifying the post author of a new comment. Filter function arguments: mail subject, comment ID. Note that this happens inside the default wp_notify_postauthor function, which is a “pluggable” function, meaning that plugins can override it; see Plugin API).

comment_notification_text: applied to the body of the mail message before sending email notifying the post author of a new comment. Filter function arguments: mail body text, comment ID. Note that this happens inside the default wp_notify_postauthor function, which is a “pluggable” function, meaning that plugins can override it; see Plugin API).

comment_row_actions: applied to the list of action links under each comment row (like Reply, Quick Edit, Edit).

cron_request: Allows filtering of the URL, key and arguments passed to wp_remote_post() in spawn_cron().

cron_schedules: applied to an empty array to allow a plugin to generate cron schedules in the wp_get_schedules function.

custom_menu_order: used to activate the ‘menu_order’ filter.

default_content: applied to the default post content prior to opening the editor for a new post.

default_excerpt: applied to the default post excerpt prior to opening the editor for a new post.

default_title: applied to the default post title prior to opening the editor for a new post.

editable_slug: applied to the post, page, tag or category slug by the get_sample_permalink function.

explain_nonce_(verb)-(noun): allows a filter function to define text to be used to explain a nonce that is otherwise not explained by the WordPress core code. You will need to define specific verb/noun filters to use this. For instance, if your plugin defines a nonce for updating a tag, you would define a filter for “explain_nonce_update-tag”. Filter function arguments: text to display (defaults to a generic “Are you sure you want to do this?” message) and extra information from the end of the action URL. In the example here, your function might simply return the string “Are you sure you want to update this tag?”.

format_to_edit: applied to post content, excerpt, title, and password by the format_to_edit function, which is called by the admin menus to set up a post for editing. Also applied to when editing comments in the admin menus.

format_to_post: applied to post content by the format_to_post function, which is not used in WordPress by default.

manage_edit-${post_type}_columns: applied to the list of columns to print on the manage posts screen for a custom post type. Filter function argument/return value is an associative array where the element key is the name of the column, and the value is the header text for that column. See also action manage_${post_type}_posts_custom_column, which puts the column information into the edit screen.

manage_link-manager_columns: was manage_link_columns until wordpress 2.7. applied to the list of columns to print on the blogroll management screen. Filter function argument/return value is an associative list where the element key is the name of the column, and the value is the header text for that column. See also action manage_link_custom_column, which puts the column information into the edit screen.

manage_posts_columns: applied to the list of columns to print on the manage posts screen. Filter function argument/return value is an associative array where the element key is the name of the column, and the value is the header text for that column. See also action manage_posts_custom_column, which puts the column information into the edit screen. (see Scompt’s tutorial for examples and use.)

manage_pages_columns: applied to the list of columns to print on the manage pages screen. Filter function argument/return value is an associative array where the element key is the name of the column, and the value is the header text for that column. See also action manage_pages_custom_column, which puts the column information into the edit screen.

manage_users_columns

manage_users_custom_column

manage_users_sortable_columns

media_row_actions: applied to the list of action links under each file in the Media Library (like View, Edit).

menu_order: applied to the array for the admin menu order. Must be activated with the ‘custom_menu_order’ filter before.

nonce_life: applied to the lifespan of a nonce to generate or verify the nonce. Can be used to generate nonces which expire earlier. The value returned by the filter should be in seconds.

nonce_user_logged_out: applied to the current user ID used to generate or verify a nonce when the user is logged out.

plugin_row_meta: add additional links below each plugin on the plugins page.

postmeta_form_limit: applied to the number of post-meta information items shown on the post edit screen.

post_row_actions: applied to the list of action links (like Quick Edit, Edit, View, Preview) under each post in the Posts > All Posts section.

post_updated_messages: applied to the array storing user-visible administrative messages when working with posts, pages and custom post types. This filter is used to change the text of said messages, not to trigger them. See “customizing the messages” in the register_post_type documentation.

pre_upload_error: applied to allow a plugin to create an XMLRPC error for uploading files.

preview_page_link: applied to the link on the page editing screen that shows the page preview at the bottom of the screen.

preview_post_link: applied to the link on the post editing screen that shows the post preview at the bottom of the screen.

richedit_pre: applied to post content by the wp_richedit_pre function, before displaying in the rich text editor.

schedule_event: applied to each recurring and single event as it is added to the cron schedule.

set-screen-option: Filter a screen option value before it is set.

show_password_fields: applied to the true/false variable that controls whether the user is presented with the opportunity to change their password on the user profile screen (true means to show password changing fields; false means don’t).

terms_to_edit: applied to the CSV of terms (for each taxonomy) that is used to show which terms are attached to the post.

the_editor: applied to the HTML DIV created to house the rich text editor, prior to printing it on the screen. Filter function argument/return value is a string.

user_can_richedit: applied to the calculation of whether the user’s browser has rich editing capabilities, and whether the user wants to use the rich editor, in the user_can_richedit function. Filter function argument and return value is true/false if the current user can/cannot use the rich editor.

user_has_cap: applied to a user’s capabilities list in the WP_User->has_cap function (which is called by the current_user_can function). Filter function arguments are the capabilities list to be filtered, the capability being questioned, and the argument list (which has things such as the post ID if the capability is to edit posts, etc.)

wp_handle_upload_prefilter: applied to the upload information when uploading a file. Filter function argument: array which represents a single element of $_FILES.

wp_handle_upload: applied to the upload information when uploading a file. Filter function argument: array with elements “file” (file name), “url”, “type”.

wp_revisions_to_keep: alters how many revisions are kept for a given post. Filter function arguments: number representing desired revisions saved (default is unlimited revisions), the post object.

wp_terms_checklist_args: applied to arguments of the wp_terms_checklist() function. Filter function argument: array of checklist arguments, post ID.

wp_upload_tabs: applied to the list of custom tabs to display on the upload management admin screen. Use action upload_files_(tab) to display a page for your custom tab (see Plugin API/Action Reference).

media_upload_tabs: applied to the list of custom tabs to display on the upload management admin screen. Use action upload_files_(tab) to display a page for your custom tab (see Plugin API/Action Reference).

plugin_action_links_(plugin file name): applied to the list of links to display on the plugins page (beside the activate/deactivate links).

views_edit-post: applied to the list posts eg All (30) | Published (22) | Draft (5) | Pending (2) | Trash (1)

Rich Text Editor Filters

These filters modify the configuration of the rich text editor, TinyMCE.

mce_spellchecker_languages: applied to the language selection available in the spell checker.

mce_buttons, mce_buttons_2, mce_buttons_3, mce_buttons_4: applied to the rows of buttons for the rich editor toolbar (each is an array of button names).

mce_css: applied to the CSS file URL for the rich text editor.

mce_external_plugins: applied to the array of external plugins to be loaded by the rich text editor.

mce_external_languages: applied to the array of language files loaded by external plugins, allowing them to use the standard translation method (see tinymce/langs/wp-langs.php for reference).

tiny_mce_before_init: applied to the whole init array for the editor.

Template Filters

This section contains links related to themes, templates, and style files.

locale_stylesheet_uri: applied to the locale-specific stylesheet URI returned by the get_locale_stylesheet_uri function. Filter function arguments: URI, stylesheet directory URI.

stylesheet: applied to the stylesheet returned by the get_stylesheet function.

stylesheet_directory: applied to the stylesheet directory returned by the get_stylesheet_directory function. Filter function arguments: stylesheet directory, stylesheet.

stylesheet_directory_uri: applied to the stylesheet directory URI returned by the get_stylesheet_directory_uri function. Filter function arguments: stylesheet directory URI, stylesheet.

stylesheet_uri: applied to the stylesheet URI returned by the get_stylesheet_uri function. Filter function arguments: stylesheet URI, stylesheet.

template: applied to the template returned by the get_template function.

template_directory: applied to the template directory returned by the get_template_directory function. Filter function arguments: template directory, template.

template_directory_uri: applied to the template directory URI returned by the get_template_directory_uri function. Filter function arguments: template directory URI, template.

theme_root: applied to the theme root directory (normally wp-content/themes) returned by the get_theme_root function.

theme_root_uri: applied to the theme root directory URI returned by the get_theme_root_uri function. Filter function arguments: URI, site URL.

You can also replace individual template files from your theme, by using the following filter hooks. See also the template_redirect action hook. Each of these filters takes as input the path to the corresponding template file in the current theme. A plugin can modify the file to be used by returning a new path to a template file.

404_template
archive_template: You can use this for example to enforce a specific template for a custom post type archive. This way you can keep all the code in a plugin.
attachment_template
author_template
category_template
comments_popup_template
comments_template: The “comments_template” filter can be used to load a custom template form a plugin which replace the themes default comment template.
date_template
home_template
page_template
paged_template
search_template
single_template: You can use this for example to enforce a specific template for a custom post type. This way you can keep all the code in a plugin.
shortcut_link: applied to the “Press This” bookmarklet link.
template_include
wp_nav_menu_args: applied to the arguments of the wp_nav_menu function.

Kubrick Filters

These filters were present in the pre-3.0 default theme kubrick.

kubrick_header_color: applied to the color for the header of the kubrick theme.

kubrick_header_display: applied to the display option for the header of the kubrick theme.

kubrick_header_image: applied to the header image file for the kubrick theme.

Registration & Login Filters

authenticate: allows basic authentication to be performed on login based on username and password.

registration_errors: applied to the list of registration errors generated while registering a user for a new account.

user_registration_email: applied to the user’s email address read from the registration page, prior to trying to register the person as a new user.

validate_username: applied to the validation result on a new user name. Filter function arguments: valid (true/false), user name being validated.

wp_authenticate_user: applied when a user attempted to log in, after WordPress validates username and password, but before validation errors are checked.

Redirect/Rewrite Filters

These advanced filters relate to WordPress’s handling of rewrite rules.

allowed_redirect_hosts: applied to the list of host names deemed safe for redirection. wp-login.php uses this to defend against a dangerous ‘redirect_to’ request parameter

author_rewrite_rules: applied to the author-related rewrite rules after they are generated.

category_rewrite_rules: applied to the category-related rewrite rules after they are generated.

comments_rewrite_rules: applied to the comment-related rewrite rules after they are generated.

date_rewrite_rules: applied to the date-related rewrite rules after they are generated.

mod_rewrite_rules: applied to the list of rewrite rules given to the user to put into their .htaccess file when they change their permalink structure. (Note: replaces deprecated filter rewrite_rules.)

page_rewrite_rules: applied to the page-related rewrite rules after they are generated.

post_rewrite_rules: applied to the post-related rewrite rules after they are generated.

redirect_canonical: Can be used to cancel a “canonical” URL redirect. Accepts 2 parameters: $redirect_url, $requested_url. To cancel the redirect return FALSE, to allow the redirect return $redirect_url

rewrite_rules_array: applied to the entire rewrite rules array after it is generated.

root_rewrite_rules: applied to the root-level rewrite rules after they are generated.

search_rewrite_rules: applied to the search-related rewrite rules after they are generated.

wp_redirect: applied to a redirect URL by the default wp_redirect function. Filter function arguments: URL, HTTP status code. Note that wp_redirect is also a “pluggable” function, meaning that plugins can override it; see Plugin API).

wp_redirect_status: applied to the HTTP status code when redirecting by the default wp_redirect function. Filter function arguments: HTTP status code, URL. Note that wp_redirect is also a “pluggable” function, meaning that plugins can override it; see Plugin API).

WP_Query Filters

These are filters run by the WP_Query object in the course of building and executing a query to retrieve posts. See also #Advanced WordPress Filters for queries relating to users, meta values, and more generic queries.

found_posts: applied to the list of posts, just after querying from the database.

found_posts_query: after the list of posts to display is queried from the database, WordPress selects rows in the query results. This filter allows you to do something other than SELECT FOUND_ROWS() at that step.

post_limits: applied to the LIMIT clause of the query that returns the post array.

posts_clauses: applied to the entire SQL query, divided into a keyed array for each clause type, that returns the post array. Can be easier to work with than posts_request.

posts_distinct: allows a plugin to add a DISTINCTROW clause to the query that returns the post array.

posts_fields: applied to the field list for the query that returns the post array.

posts_groupby: applied to the GROUP BY clause of the query that returns the post array (normally empty).

posts_join: applied to the JOIN clause of the query that returns the post array. This is typically used to add a table to the JOIN, in combination with the posts_where filter.

posts_join_paged: applied to the JOIN clause of the query that returns the post array, after the paging is calculated (though paging does not affect the JOIN, so this is actually equivalent to posts_join).

posts_orderby: applied to the ORDER BY clause of the query that returns the post array.

posts_request: applied to the entire SQL query that returns the post array, just prior to running the query.

posts_results: allows you to manipulate the resulting array returned from the query.

posts_search: applied to the search SQL that is used in the WHERE clause of WP_Query.

posts_where: applied to the WHERE clause of the query that returns the post array.

posts_where_paged: applied to the WHERE clause of the query that returns the post array, after the paging is calculated (though paging does not affect the WHERE, so this is actually equivalent to posts_where).

the_posts: applied to the list of posts queried from the database after minimal processing for permissions and draft status on single-post pages.

Media Filters

This section contains media filters that are used to integrated different types of media.

editor_max_image_size

image_downsize

get_image_tag_class

get_image_tag

image_resize_dimensions

intermediate_image_sizes

icon_dir

wp_get_attachment_image_attributes

img_caption_shortcode

post_gallery

use_default_gallery_style

gallery_style

(adjacent)_image_link

embed_defaults

load_default_embeds

embed_googlevideo

upload_size_limit

wp_image_editors

plupload_default_settings

plupload_default_params

image_size_names_choose

wp_prepare_attachment_for_js

media_upload_tabs

disable_captions

media_view_settings

media_view_strings

wp_handle_upload_prefilter

Advanced WordPress Filters

This section contains advanced filters related to internationalization, miscellaneous queries, and other fundamental WordPress functions.

create_user_query: applied to the query used to save a new user’s information to the database, just prior to running the query.

get_editable_authors: applied to the list of post authors that the current user is authorized to edit in the get_editable_authors function.

get_next_post_join: in function get_next_post (which finds the post after the currently-displayed post), applied to the SQL JOIN clause (which normally joins to the category table if user is viewing a category archive). Filter function arguments: JOIN clause, stay in same category (true/false), list of excluded categories.

get_next_post_sort: in function get_next_post (which finds the post after the currently-displayed post), applied to the SQL ORDER BY clause (which normally orders by post date in ascending order with a limit of 1 post). Filter function arguments: ORDER BY clause.

get_next_post_where: in function get_next_post (which finds the post after the currently-displayed post), applied to the SQL WHERE clause (which normally looks for the next dated published post). Filter function arguments: WHERE clause, stay in same category (true/false), list of excluded categories.

get_previous_post_join: in function get_previous_post (which finds the post before the currently-displayed post), applied to the SQL JOIN clause (which normally joins to the category table if user is viewing a category archive). Filter function arguments: join clause, stay in same category (true/false), list of excluded categories.

get_previous_post_sort: in function get_previous_post (which finds the post before the currently-displayed post), applied to the SQL ORDER BY clause (which normally orders by post date in descending order with a limit of 1 post). Filter function arguments: ORDER BY clause.

get_previous_post_where: in function get_previous_post (which finds the post before the currently-displayed post), applied to the SQL WHERE clause (which normally looks for the previous dated published post). Filter function arguments: WHERE clause, stay in same category (true/false), list of excluded categories.

gettext: applied to the translated text by the translation() function (which is called by functions like the __() and _e() internationalization functions ). Filter function arguments: translated text, untranslated text and the text domain. Gets applied even if internationalization is not in effect or if the text domain has not been loaded.

override_load_textdomain

get_meta_sql: in function WP_Meta_Query::get_sql (which generates SQL clauses to be appended to a main query for advanced meta queries.), applied to the SQL JOIN and WHERE clause generated by the advanced meta query. Filter function arguments: array( compact( ‘join’, ‘where’ ), $this->queries, $type, $primary_table, $primary_id_column, $context )

get_others_drafts: applied to the query that selects the other users’ drafts for display in the admin menus.

get_users_drafts: applied to the query that selects the users’ drafts for display in the admin menus.

locale: applied to the locale by the get_locale function.

query: applied to all queries (at least all queries run after plugins are loaded).

query_string: deprecated – use query_vars or request instead.
query_vars: applied to the list of public WordPress query variables before the SQL query is formed. Useful for removing extra permalink information the plugin has dealt with in some other manner.

request: like query_vars, but applied after “extra” and private query variables have been added.

excerpt_length: Defines the length of a single-post excerpt.

excerpt_more: Defines the more string at the end of the excerpt.

post_edit_form_tag: Allows you to append code to the form tag in the default post/page editor.

update_user_query: applied to the update query used to update user information, prior to running the query.

uploading_iframe_src (removed since WP 2.5): applied to the HTML src tag for the uploading iframe on the post and page editing screens.

xmlrpc_methods: applied to list of defined XMLRPC methods for the XMLRPC server.

wp_mail_from: applied before any mail is sent by the wp_mail function. Supplied value is the calculated from address which is wordpress at the current hostname (set by $_SERVER[‘SERVER_NAME’]). The filter should return an email address or name/email combo in the form “user@example.com” or “Name <user@example.com>” (without the quotes!).

wp_mail_from_name: applied before any mail is sent by the wp_mail function. The filter should return a name string to be used as the email from name.

update_(meta_type)_metadata: applied before a metadata gets updated. For example if a user metadata gets updated the hook would be ‘update_user_metadata’

Widgets

This section contains filters added by widgets present in WordPress core.

dynamic_sidebar_params: applied to the arguments passed to the widgets_init function in the WordPress widgets.

widget_archives_dropdown_args: applied to the arguments passed to the wp_get_archives() function in the WordPress Archives widget.

widget_categories_args: applied to the arguments passed to the wp_list_categories() function in the WordPress Categories widget.

widget_links_args: applied to the arguments passed to the wp_list_bookmarks() function in the WordPress Links widget.

widget_nav_menu_args: applied to the arguments passed to the wp_nav_menu() function in the WordPress Custom Menu widget.

widget_pages_args: applied to the arguments passed to the wp_list_pages() function in the WordPress Pages widget.

widget_tag_cloud_args: applied to the arguments passed to the wp_tag_cloud() function in the WordPress Pages widget.

widget_text: applied to the widget text of the WordPress Text widget. May also apply to some third party widgets as well.

widget_title: applied to the widget title of any user editable WordPress Widget. May also apply to some third party widgets as well.

Admin Bar

This section contains filters added by the Admin Bar added in WordPress 3.1.0.

wp_admin_bar_class: allows changing the default ‘WP_Admin_Bar’ class in the _wp_admin_bar_init() function in wp-includes/admin-bar.php.

Plugin API/Action Reference

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This is a (hopefully) comprehensive list of action hooks available in WordPress version 2.1 and above. For more information:

To learn more about what filter and action hooks are, see Plugin API.
To learn about writing plugins in general, see Writing a Plugin.
For a reference list of filter hooks, see Plugin API/Filter Reference.
For information about filter and action hooks in previous versions of WordPress, see Plugin API/Hooks 2.0.x.

(If you want to add to or clarify this documentation, please follow the style of the existing entries. Describe when the action runs, and if the action function takes arguments, describe the arguments.)

Actions Run During a Typical Request

These actions are called when a logged-in user opens the home page in Version 3.3.1. This list may show only the first time each action is called, and in many cases no function is hooked to the action. Themes and plugins can cause actions to be called multiple times and at differing times during a request. As proof of this, you can see action calls specific to the Twenty Eleven theme on this list. Cron tasks may also fire when a user visits the site, adding additional action calls. This list should be viewed as a guide line or approximation of WordPress action execution order, and not a concrete specification.

Actions are called with the function do_action(), except those marked (ref array), which are called with the function do_action_ref_array().

muplugins_loaded	After must-use plugins are loaded
registered_taxonomy	For category, post_tag, etc.
registered_post_type	For post, page, etc.
plugins_loaded	After active plugins and pluggable functions are loaded
sanitize_comment_cookies
setup_theme
load_textdomain	For the `default` domain
after_setup_theme	Generally used to initialize theme settings/options. This is the first action hook available to themes, triggered immediately after the active theme’s functions.php file is loaded. `add_theme_support()` should be called here, since the `init` action hook is too late to add some features. At this stage, the current user is not yet authenticated.
auth_cookie_malformed
auth_cookie_valid
set_current_user
init	Typically used by plugins to initialize. The current user is already authenticated by this time.
└─ widgets_init	Used to register sidebars. Fired at ‘init’ priority 1 (and so before ‘init’ actions with priority ≥ 1!)
register_sidebar	For each sidebar and footer area
wp_register_sidebar_widget	For each widget
wp_default_scripts	(ref array)
wp_default_styles	(ref array)
admin_bar_init
add_admin_bar_menus
wp_loaded	After WordPress is fully loaded
parse_request	Allows manipulation of HTTP request handling (ref array)
send_headers	Allows customization of HTTP headers (ref array)
parse_query	After query variables are set (ref array)
pre_get_posts	Exposes the query-variables object before a query is executed. (ref array)
posts_selection
wp	After WP object is set up (ref array)
template_redirect
get_header
wp_enqueue_scripts
twentyeleven_enqueue_color_scheme (Specific to Twenty Eleven)
wp_head
wp_print_styles
wp_print_scripts
get_search_form
loop_start	(ref array)
the_post	(ref array) Allows modification of the post object immediately after query
get_template_part_content	Template part for the content
loop_end	(ref array)
get_sidebar
dynamic_sidebar
get_search_form
pre_get_comments	(ref array)
wp_meta
get_footer
get_sidebar	This ‘sidebar’ is a footer area
twentyeleven_credits	(Specific to Twenty Eleven)
wp_footer
wp_print_footer_scripts
admin_bar_menu	(ref array)
wp_before_admin_bar_render
wp_after_admin_bar_render
shutdown	PHP execution is about to end

Actions Run During an Admin Page Request

These actions are run when a logged-in user opens the Posts page in Version 3.3.1. This list shows only the first time an action is called, and in many cases no function is hooked to the action. Each admin page has a different list of actions depending upon the purpose of the page and the plugins installed. This list should be viewed as a guide line or approximation, and not a concrete specification.

In these actions, (hookname) depends on the page. For the Posts page it is edit.php, or for a theme’s Background page it is appearance_page_custom-background.

Actions are called with the function do_action(), except those marked (ref array), which are called with the function do_action_ref_array().

muplugins_loaded	After must-use plugins are loaded
registered_taxonomy	For category, post_tag, etc.
registered_post_type	For post, page, etc.
plugins_loaded	After active plugins and pluggable functions are loaded
sanitize_comment_cookies
setup_theme
load_textdomain	For domain `default`
after_setup_theme	At this stage, the current user is not yet authenticated.
load_textdomain	For domain `twentyeleven`
auth_cookie_valid
set_current_user
init	Typically used by plugins to initialize. The current user is already authenticated by this time.
└─ widgets_init	Used to register sidebars. This is fired at ‘init’, with a priority of 1.
register_sidebar	For each sidebar
wp_register_sidebar_widget	For each widget
wp_default_scripts	(ref array)
wp_default_styles	(ref array)
admin_bar_init
add_admin_bar_menus
wp_loaded	After WordPress is fully loaded
auth_cookie_valid
auth_redirect
_admin_menu	See also: _user_admin_menu, _network_admin_menu
admin_menu	See also: user_admin_menu, network_admin_menu
admin_init
current_screen
load-(page)
send_headers	Where custom HTTP headers can be added
pre_get_posts	Exposes the query-variables object before a query is executed. (ref array)
posts_selection
wp	After WP object is set up (ref array)
admin_xml_ns
admin_xml_ns
admin_enqueue_scripts
admin_print_styles-(hookname)
admin_print_styles
admin_print_scripts-(hookname)
admin_print_scripts
wp_print_scripts
admin_head-(hookname)
admin_head
adminmenu
in_admin_header
admin_notices
all_admin_notices
(hookname)
restrict_manage_posts
the_post	(ref array)
pre_user_query	(ref array)
in_admin_footer
admin_footer
admin_bar_menu	(ref array)
wp_before_admin_bar_render
wp_after_admin_bar_render
admin_print_footer_scripts
admin_footer-(hookname)	Admin page footer
shutdown	PHP execution is about to end
wp_dashboard_setup	Allows customization of admin Dashboard

Post, Page, Attachment, and Category Actions (Admin)

post_submitbox_misc_actions: Runs when an editing page gets generated to add some content (eg. fields) to the submit box (where the publish button is shown). No function arguments.

add_attachment: Runs when an attached file is first added to the database. Action function arguments: attachment ID.

add_category: Same as create_category.

category_add_form_fields: Runs when category add form is cerated in admin. Useful to add a field in this form before the submit button

category_edit_form: Runs when category edit form is created in admin. Useful to add a new field to this form

clean_post_cache: Runs when post cache is cleaned. Action function arguments: post ID. See clean_post_cache().

create_category: Runs when a new category is created. Action function arguments: category ID.

delete_attachment: Runs just before an attached file is deleted from the database. Action function arguments: attachment ID. (Prior to version 2.8 this hook was triggered after attachment was deleted.)

delete_category: Runs just after a category is deleted from the database and its corresponding links/posts are updated to remove the category. Action function arguments: category ID.

wp_trash_post: Runs when a post or page is about to be trashed. Action function arguments: post or page ID.

trashed_post: Runs just after a post or page is trashed. Action function arguments: post or page ID.

untrash_post: Runs just before undeletion, when a post or page is restored. Action function arguments: post or page ID.

untrashed_post: Runs just after undeletion, when a post or page is restored. Action function arguments: post or page ID.

before_delete_post: Runs when a post or page is about to be deleted. Comments, attachments and metadata are still available. Action function arguments: post or page ID.

delete_post: Runs when a post or page is about to be deleted. Comments, attachments and metadata are already deleted. Action function arguments: post or page ID.

deleted_post: Runs just after a post or page is deleted. Action function arguments: post or page ID.

edit_attachment: Runs when an attached file is edited/updated to the database. Action function arguments: attachment ID.

edit_category: Runs when a category is updated/edited, including when a post or blogroll link is added/deleted or its categories are updated (which causes the count for the category to update). Action function arguments: category ID.

edit_post: Runs when a post or page is updated/edited, including when a comment is added or updated (which causes the comment count for the post to update). Action function arguments: post or page ID.

pre_post_update: Runs just before a post or page is updated. Action function arguments: post or page ID.

post_updated: Runs after a post or page is updated. Action function arguments: post or page ID, WP_Post object of the post before the update and after the update.

transition_post_status: Runs when any post status transition occurs. Action function arguments: $new_status, $old_status, $post object. (See also Post Status Transitions.)

(old status)_to_(new status): Runs when a post changes status from $old_status to $new_status. Action function arguments: $post object. (See also Post Status Transitions.)

(status)_(post_type): Runs when a post of type $post_type is transitioned to $status from any other status. Action function arguments: post ID, $post object. (See also Post Status Transitions.)

publish_post (not deprecated): Runs when a post is published, or if it is edited and its status is changed to “published”. This action hook conforms to the (status)_(post_type) action hook type. Action function arguments: post ID, $post object. (See also Post Status Transitions.)

publish_page: Runs when a page is published, or if it is edited and its status is changed to “published”. This action hook conforms to the (status)_(post_type) action hook type. Action function arguments: post ID, $post object. (See also Post Status Transitions.)

publish_phone: Runs just after a post is added via email. Action function argument: post ID.

publish_future_post: Runs when a future post or page is published. Action function arguments: post ID.

save_post: Runs whenever a post or page is created or updated, which could be from an import, post/page edit form, xmlrpc, or post by email. Action function arguments: post ID and post object. Runs after the data is saved to the database. Note that post ID may reference a post revision and not the last saved post. Use wp_is_post_revision() to get the ID of the real post.

updated_postmeta: Runs when a metadata has been updated.

wp_insert_post: Same as save_post, runs immediately afterwards.

xmlrpc_publish_post: Runs when a post is published via XMLRPC request, or if it is edited via XMLRPC and its status is “published”. Action function arguments: post ID.

Taxonomy and Terms

edit_terms: (actually an action, but often used like a filter) hooked in prior to saving taxonomy/category change in the database

edited_terms: applied after saving taxonomy/category change in the database.

edited_$taxonomy: applied after saving specific taxonomy change in the database

Comment, Ping, and Trackback Actions

comment_closed: Runs when the post is marked as not allowing comments while trying to display comment entry form. Action function argument: post ID.

comment_id_not_found: Runs when the post ID is not found while trying to display comments or comment entry form. Action function argument: post ID.

comment_flood_trigger: Runs when a comment flood is detected, just before wp_die is called to stop the comment from being accepted. Action function arguments: time of previous comment, time of current comment.

comment_(old status)_to_(new status): Runs when a comment status transition occurs. Action function arguments: Comment object.

comment_on_draft: Runs when the post is a draft while trying to display a comment entry form or comments. Action function argument: post ID.

comment_post: Runs just after a comment is saved in the database. Action function arguments: comment ID, approval status (“spam”, or 0/1 for disapproved/approved).

edit_comment: Runs after a comment is updated/edited in the database. Action function arguments: comment ID.

delete_comment: Runs just before a comment is deleted. Action function arguments: comment ID.

deleted_comment: Runs just after a comment is deleted. Action function arguments: comment ID.

trash_comment: Runs just before a comment is trashed. Action function arguments: comment ID.

trashed_comment: Runs just after a comment is trashed. Action function arguments: comment ID.

comment_closed: Runs when the post is marked as not a spam.

pingback_post: Runs when a ping is added to a post. Action function argument: comment ID.

pre_ping: Runs before a ping is fully processed. Action function arguments: array of the post links to be processed, and the “pung” setting for the post.

trackback_post: Runs when a trackback is added to a post. Action function argument: comment ID.

wp_blacklist_check: Runs to check whether a comment should be blacklisted. Action function arguments: author name, author email, author URL, comment text, author IP address, author’s user agent (browser). Your function can execute a wp_die to reject the comment, or perhaps modify one of the input arguments so that it will contain one of the blacklist keywords set in the WordPress options.

wp_insert_comment: Runs whenever a comment is created.

wp_set_comment_status: Runs when the status of a comment changes. Action function arguments: comment ID, status string indicating the new status (“delete”, “approve”, “spam”, “hold”).

Feed Actions

atom_entry: Runs just after the entry information has been printed (but before closing the entry tag) for each blog entry in an atom feed.

atom_head: Runs just after the blog information has been printed in an atom feed, just before the first entry.

atom_ns: Runs inside the root XML element for an atom feed (to add namespaces).

commentrss2_item: Runs just after a single comment’s information has been printed in a comment feed (but before closing the item tag). Action function arguments: comment ID, post ID.

do_feed_(feed): Runs when a feed is generated, where feed is the type of feed (rss2, atom, rdf, etc.). Use priority less than 10 to run before printing the feed. Action function argument: true (the feed is for comments) or false (it is for posts).

rdf_header: Runs just after the blog information has been printed in an RDF feed, just before the first entry.

rdf_item: Runs just after the entry information has been printed (but before closing the item tag) for each blog entry in an RDF feed.

rdf_ns: Runs inside the root XML element in an RDF feed (to add namespaces).

rss_head: Runs just after the blog information has been printed in an RSS feed, just before the first entry.

rss_item: Runs just after the entry information has been printed (but before closing the item tag) for each blog entry in an RSS feed.

rss2_head: Runs just after the blog information has been printed in an RSS 2 feed, just before the first entry.

rss2_item: Runs just after the entry information has been printed (but before closing the item tag) for each blog entry in an RSS 2 feed.

rss2_ns: Runs inside the root XML element in an RSS 2 feed (to add namespaces).

Template Actions

after_setup_theme: Runs during a themes initialization. Is generally used to perform basic setup, registration, and init actions for a theme.

comment_form: Runs at the bottom of a comment form rendered by comment_form(), right before the closing </form>. Action function argument: the post ID.

do_robots: Runs when the template file chooser determines that it is a robots.txt request.

do_robotstxt: Runs in the do_robots() function before it prints out the Disallow lists for the robots.txt file.

get_footer: Runs when the template calls the get_footer() function, just before the footer.php template file is loaded.

get_header: Runs when the template calls the get_header() function, just before the header.php template file is loaded.

switch_theme: Runs when the blog’s theme is changed. Action function argument: name of the new theme. If used in a theme, it only works if the theme that adds action is the one being disabled.

after_switch_theme: Runs when the blog’s theme is changed. Action function argument: name of the new theme. If used in a theme, it only works if the theme that adds action is the one being enabled. Can be used to run certain code when enabling a theme.

load-themes.php: Runs when the theme is activate or deactivate (replace by an other).

template_redirect: Runs before the determination of the template file to be used to display the requested page.

wp_footer: Runs when the template calls the wp_footer() function, generally near the bottom of the blog page.

wp_head: Runs when the template calls the wp_head() function. This hook is generally placed near the top of a page template between <head> and </head>. This hook does not take any parameters.

wp_meta: Runs when the sidebar.php template file calls the wp_meta() function, to allow the plugin to insert content into the sidebar.

wp_print_scripts: Runs just before WordPress prints registered JavaScript scripts into the page header.

Administrative Actions

activate_(plugin file name): Runs when the plugin is first activated. See Function_Reference/register_activation_hook.

activity_box_end: Runs at the end of the activity box on the admin Dashboard screen.

add_category_form_pre: Runs before the add category form is put on the screen in the admin menus.

add_option_(option_name): Runs after a WordPress option has been added by the add_option() function. Action function arguments: option name, option value. You must add an action for the specific options that you want to respond to, such as ‘add_option_foo’ to respond when option “foo” has been added.

add_option: Runs before an option gets added to the database.

added_option: Runs after an an option has been added.

admin_head: Runs in the HTML <head> section of the admin panel.

admin_head-(page_hook) or admin_head-(plugin_page): Runs in the HTML <head> section of a specific admin page or the admin panel of a plugin-generated page.

admin_init: Runs at the beginning of every admin page before the page is rendered. See wp-admin/admin.php, wp-admin/admin-post.php, and wp-admin/admin-ajax.php.

admin_footer-(plugin_page): Runs at the end of the <body> section of the admin panel of a plugin-generated page.

admin_post_(action): also: admin_post_nopriv_(action) – Runs a handler for an unspecified GET or POST request.

admin_footer: Runs at the end of the admin panel inside the body tag

admin_enqueue_scripts: Runs in the HTML header so a plugin or theme can enqueue JavaScript and CSS to all admin pages.

admin_print_scripts: Runs in the HTML header so a plugin can add JavaScript scripts to all admin pages.

admin_print_scripts-(page_hook) or admin_print_scripts-(plugin_page): Runs to print JavaScript scripts in the HTML head section of a specific plugin-generated admin page. The (page_hook) is returned when using any of the functions that add plugin menu items to the admin menu: add_management_page(), add_options_page(), etc. Example:

function myplugin_menu() {
  if ( function_exists('add_management_page') ) {
    $page = add_management_page( 'myplugin', 'myplugin', 'manage_options', 'myplugin_slug', 'myplugin_admin_page' );
    add_action( "admin_print_scripts-$page", 'myplugin_admin_head' );
  }
}

admin_print_styles: Runs in the HTML header so a plugin can add CSS/Stylesheets to all admin pages.

admin_print_styles-(page_hook) or admin_print_style-(plugin_page): Runs when styles should be enqueued with wp_enqueue_style() for a particular admin page. Use the return value of a function such as add_submenu_page() to determine the value of (page_hook).

check_passwords: Runs to validate the double-entry of password when creating a new user. Action function arguments: array of login name, first password, second password.

dbx_page_advanced: Runs at the bottom of the “advanced” section on the page editing screen in the admin menus.

dbx_page_sidebar: Runs at the bottom of the sidebar on the page editing screen in the admin menus.

dbx_post_advanced: Runs at the bottom of the “advanced” section on the post editing screen in the admin menus.

dbx_post_sidebar: Runs at the bottom of the sidebar on the post editing screen in the admin menus. Use add_meta_box() in WordPress 2.5 and higher.

deactivate_(plugin file name): Runs when a plugin is deactivated.

delete_option_(option_name): Runs after a WordPress option has been deleted by the delete_option() function. Action function arguments: option name. You must add an action for the specific options that you want to respond to, such as ‘delete_option_foo’ to respond when option “foo” has been deleted.

delete_option: Runs before an option gets deleted from the database.

deleted_option: Runs after an an option has been deleted.

delete_user: Runs when a user is deleted. Action function arguments: user ID.

edit_category_form: Runs after the add/edit category form is put on the screen (but before the end of the HTML form tag).

edit_category_form_pre: Runs before the edit category form is put on the screen in the admin menus.

edit_tag_form: Runs after the add/edit tag form is put on the screen (but before the end of the HTML form tag).

edit_tag_form_pre: Runs before the edit tag form is put on the screen in the admin menus.

edit_form_top: Runs inside the form before the title on WordPress post edit screen (and Custom Post Types), but after the inital hidden fields (user_ID, action, etc.).

edit_form_after_title: Runs after the title on WordPress post edit screen (and Custom Post Types) but before the built in WordPress content area.

edit_form_after_editor: Runs just after the WordPress post editor but before all other meta boxes. also available in Custom Post Types.

edit_form_advanced: Runs just before the “advanced” section of the post editing form in the admin menus.

edit_page_form: Runs just before the “advanced” section of the page editing form in the admin menus.

edit_user_profile: Runs near the end of the user profile editing screen in the admin menus.

load-(page): Runs when an administration menu page is loaded. This action is not usually added directly — see Adding Administration Menus for more details of how to add admin menus. If you do want to use it directly, the return value from add_options_page() and similar functions gives you the “(page)” part of the action name.

login_form: Runs just before the end of the login form.

login_head: Runs just before the end of the HTML head section of the login page.

lost_password: Runs before the “retrieve your password by email” form is printed on the login screen.

lostpassword_form: Runs at the end of the form used to retrieve a user’s password by email, to allow a plugin to supply extra fields.

lostpassword_post: runs when the user has requested an email message to retrieve their password, to allow a plugin to modify the PHP $_POST variable before processing.

manage_link_custom_column: Runs when there is an unknown column name for the blogroll managing admin screen. Action function arguments: column name, link ID. See also filter manage_link_columns in the Plugin API/Filter Reference, which adds custom columns.

manage_posts_custom_column: Runs when there is an unknown column name for the managing posts admin screen. Action function arguments: column name, post ID. See also filter manage_posts_columns in the Plugin API/Filter Reference, which adds custom columns. (see Scompt’s tutorial for examples and use.)

manage_pages_custom_column: Runs when there is an unknown column name for the managing pages admin screen. Action function arguments: column name, page ID. See also filter manage_pages_columns in the Plugin API/Filter Reference, which adds custom columns.

manage_media_custom_column: Runs when there is an unknown column name for the managing media admin screen. Action function arguments: column name, page ID. See also filter manage_media_columns in the Plugin API/Filter Reference, which adds custom columns.

manage_{$post_type}_posts_custom_column: Runs when there is an unknown column name for the managing custom post type admin screen. Action function arguments: column name, post ID. See also filter manage_${post_type}_posts_columns in the Plugin API/Filter Reference, which adds custom columns for custom post types.

password_reset: Runs before the user’s password is reset to a random new password.

personal_options_update: Runs when a user updates personal options from the admin screen.

plugins_loaded: Runs after all plugins have been loaded.

profile_personal_options: Runs at the end of the Personal Options section of the user profile editing screen.

profile_update: Runs when a user’s profile is updated. Action function argument: user ID.

quick_edit_custom_box: Runs when there is an unknown column name when creating the quick editor.

register_form: Runs just before the end of the new user registration form.

register_post: Runs before a new user registration request is processed.

restrict_manage_posts: Runs before the list of posts to edit is put on the screen in the admin menus.

retrieve_password: Runs when a user’s password is retrieved, to send them a reminder email. Action function argument: login name.

set_current_user: Runs after the user has been changed by the default wp_set_current_user() function. Note that wp_set_current_user() is also a “pluggable” function, meaning that plugins can override it; see Plugin API).

show_user_profile: Runs near the end of the user profile editing screen.

sidebar_admin_page: Runs after the main content on the widgets admin page.

sidebar_admin_setup: Runs early when editing the widgets displayed in sidebars.

simple_edit_form: Runs at the end of the “simple” post editing form in the admin menus (by default the simple form is used only for bookmarklets — it doesn’t have the “advanced” sections).

update_option_(option_name): Runs after a WordPress option has been updated by the update_option() function. Action function arguments: old option value, new option value. You must add an action for the specific options that you want to respond to, such as ‘update_option_foo’ to respond when option “foo” has been updated.

update_option: Runs before an option gets updated to the database.

updated_option: Runs after an option has been updated.

upload_files_(tab): Runs to print a screen on the upload files admin screen; “tab” is the name of the custom action tab. Define custom tabs using the wp_upload_tabs filter (see Plugin API/Filter Reference).

user_new_form: Runs near the end of the “Add New” user screen. Action function argument: Passes the string “add-existing-user” on multisite or “add-new-user” on single site and for network admins.

user_profile_update_errors: Runs just before updated user details are committed to the database.

wpmu_new_user: Runs when a user’s profile is first created in a Multisite environment. Action function argument: user ID. If not in Multisite then use user_register.

user_register: Runs when a user’s profile is first created. Action function argument: user ID.

welcome_panel: Allows you to hide the Welcome Panel in the Dashboard. This is also a smart filter, which hides the related Screen Option.

wp_ajax_(action): also: wp_ajax_nopriv_(action) – Runs to do an unknown type of AJAX request handler.

wp_authenticate: Runs to authenticate a user when they log in. Action function arguments: array with user name and password.

wp_login: Runs when a user logs in.

wp_logout: Runs when a user logs out.

Dashboard “Right Now” Widget Actions

right_now_content_table_end: Adds table rows at the bottom the content column of the Right Now Dashboard widget.

right_now_table_end: Called after displaying the number of Spam comments in the Discussion column of the Right Now Dashboard widget.

right_now_discussion_table_end: Called after displaying the number of Spam comments and after the right_now_table_end action in the Discussion column of the Right Now Dashboard widget.

right_now_end: Called after the current version information is displayed on the Right Now Dashboardwidget. (Note: In v3.4, this is actually rightnow_end. See ticket #21046.)

activity_box_end: Last action called on the Right Now Dashboard widget.

Advanced Actions

This section contains actions related to the queries WordPress uses to figure out what posts to display, the WordPress loop, activating plugins, and other fundamental-level WordPress code.

activated_plugin: Runs any time any plugin is successfully activated

add_meta_boxes: Runs when “edit post” page loads. (3.0+)

admin_menu: Runs after the basic admin panel menu structure is in place.

network_admin_notices: Runs after the admin menu is printed to network admin screens.

user_admin_notices: Runs after the admin menu is printed to user admin screens.

admin_notices: Runs after the admin menu is printed to screens that aren’t network- or user-admin screens.

all_admin_notices: Runs after the admin menu is printed to all screens.

blog_privacy_selector: Runs after the default blog privacy options are printed on the screen.

check_admin_referer: Runs in the default check_admin_referrer() function after the nonce has been checked for security purposes, to allow a plugin to force WordPress to die for extra security reasons. Note that check_admin_referrer is also a “pluggable” function, meaning that plugins can override it; see Plugin API).

check_ajax_referer: Runs in the default check_ajax_referer() function (which is called when an AJAX request goes to the wp-admin/admin-ajax.php script) after the user’s login and password have been successfully validated from cookies, to allow a plugin to force WordPress to die for extra security reasons. Note that check_ajax_referer is also a “pluggable” function, meaning that plugins can override it; see Plugin API).

customize_register: Runs on every request, allowing developers to register new theme options and controls for use with the Theme Customization API (as of Version 3.4).

deactivated_plugin: Runs any time any plugin is successfully de-activated

generate_rewrite_rules: Runs after the rewrite rules are generated. Action function arguments: WP_Rewrite object ($wp_rewrite) by reference. Note that it is easier to use the rewrite_rules_array filter instead of this action, to modify the rewrite rules.

init: Runs after WordPress has finished loading but before any headers are sent. Useful for intercepting $_GET or $_POST triggers.

loop_end: Runs after the last post of the WordPress loop is processed.

loop_start: Runs before the first post of the WordPress loop is processed.

network_admin_menu: Runs when the basic menu structure is prepared for the Network administration page. (Administration Menus)

parse_query: Runs at the end of query parsing in the main query or any instance of WP_Query, such as query_posts, get_posts, or get_children. Action function arguments: WP_Query object by reference.

parse_request: Runs after the query request is parsed inside the main WordPress function wp. Action function argument: WP object ($wp) by reference.

pre_get_posts: Runs before a query is executed in the main query or any instance of WP_Query, such as query_posts(), get_posts(), or get_children(). This hook is called after the query variable object is created, but before the query is actually run, and can be used to to alter the primary query before it is run. Also see is_main_query(). Action function arguments: WP_Query object by reference.

sanitize_comment_cookies: Runs after cookies have been read from the HTTP request.

send_headers: Runs after the basic HTTP headers are sent inside the main WordPress function wp(). Action function argument: WP object ($wp) by reference.

shutdown: Runs when the page output is complete.

update_(meta_type)_meta: Runs when a metadata gets saved.

updated_(meta_type)_meta: Runs when a metadata has been updated.

upgrader_process_complete: Runs when the plugin downloader/upgrader class finishes running

wp_loaded: This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated.

wp: Executes after the query has been parsed and post(s) loaded, but before any template execution, inside the main WordPress function wp(). Useful if you need to have access to post data but can’t use templates for output. Action function argument: WP object ($wp) by reference.

thanks to: http://www.maheshchari.com/category/wordpress/

Word Press Plugin API/Filter Reference and cheetsheet.

Post, Page, and Attachment Filters

Database Reads

attachment_fields_to_edit

attachment_icon

attachment_innerHTML

content_edit_pre

excerpt_edit_pre

get_attached_file

get_enclosed

get_pages

get_pung

get_the_excerpt

get_the_guid

get_to_ping

icon_dir

icon_dir_uri

prepend_attachment

sanitize_title

single_post_title

the_content

the_content_rss

the_editor_content

the_excerpt

the_excerpt_rss

the_tags

the_title

the_title_rss

title_edit_pre

wp_dropdown_pages

wp_list_pages

wp_list_pages_excludes

wp_get_attachment_metadata

wp_get_attachment_thumb_file

wp_get_attachment_thumb_url

wp_get_attachment_url

wp_mime_type_icon

wp_title

Database Writes

add_ping

attachment_fields_to_save

attachment_max_dims

category_save_pre

comment_status_pre

content_filtered_save_pre

content_save_pre

excerpt_save_pre

name_save_pre

phone_content

ping_status_pre

post_mime_type_pre

status_save_pre

thumbnail_filename

wp_thumbnail_creation_size_limit

wp_thumbnail_max_side_length

title_save_pre

update_attached_file

wp_delete_file

wp_generate_attachment_metadata

wp_update_attachment_metadata

Comment, Trackback, and Ping Filters

comment_excerpt

comment_flood_filter

comment_post_redirect

comment_text

comment_text_rss

comments_array

comments_number

get_comment_excerpt

get_comment_ID

get_comment_text

get_comment_type

get_comments_number

post_comments_feed_link

Database Writes

comment_save_pre

pre_comment_approved

pre_comment_content

preprocess_comment

wp_insert_post_data

Category Filters

category_description

category_feed_link

category_link

get_categories

get_category

list_cats

list_cats_exclusions

single_cat_title

the_category

the_category_rss

wp_dropdown_cats

wp_list_categories

Database Writes

pre_category_description

pre_category_name

pre_category_nicename

Link Filters

attachment_link

author_feed_link

author_link

comment_reply_link

day_link

feed_link

get_comment_author_link

get_comment_author_url_link

month_link

page_link

post_link

the_permalink

year_link

tag_link

Date and Time Filters

get_comment_date

get_comment_time

get_the_modified_date

get_the_modified_time

get_the_time

the_date

the_modified_date

the_modified_time

the_time

the_weekday

the_weekday_date

Author and User Filters

login_redirect

Database Reads

author_email

comment_author
comment_author_rss

comment_email

comment_url

get_comment_author

get_comment_author_email

get_comment_author_IP

get_comment_author_url

login_errors

login_headertitle

login_headerurl

login_message

role_has_cap

sanitize_user

the_author

the_author_email

Database Writes

pre_comment_author_email

pre_comment_author_name

pre_comment_author_url

pre_comment_user_agent

pre_comment_user_ip

pre_user_id

pre_user_description

pre_user_display_name

pre_user_email

pre_user_first_name

pre_user_last_name

pre_user_login

pre_user_nicename

pre_user_nickname

pre_user_url

registration_errors

user_registration_email

validate_username

Blog Information and Option Filters

all_options

bloginfo

bloginfo_rss

bloginfo_url

loginout

option_(option name)

pre_option_(option name)

register

upload_dir

upload_mimes

General Text Filters

attribute_escape

js_escape

Administrative Filters

autosave_interval

cat_rows

comment_edit_pre

comment_edit_redirect

comment_moderation_subject

comment_moderation_text

comment_notification_headers

comment_notification_subject

comment_notification_text

cron_schedules

custom_menu_order

default_content

default_excerpt

default_title

editable_slug

explain_nonce_(verb)-(noun)

format_to_edit

format_to_post

manage_link-manager_columns

manage_posts_columns

manage_pages_columns

menu_order

postmeta_form_limit

pre_upload_error

preview_page_link

preview_post_link

richedit_pre

show_password_fields

the_editor

user_can_richedit

user_has_cap

wp_handle_upload

wp_upload_tabs

Rich Text Editor Filters

mce_spellchecker_languages

mce_buttons, mce_buttons_2, mce_buttons_3, mce_buttons_4

mce_css

mce_external_plugins

mce_external_languages

tiny_mce_before_init

Template Filters

kubrick_header_color

kubrick_header_display

kubrick_header_image

locale_stylesheet_uri

stylesheet

stylesheet_directory

stylesheet_directory_uri

stylesheet_uri

template

template_directory

template_directory_uri

theme_root

theme_root_uri
archive_template

author_template
category_template
comments_popup_template
comments_template
date_template
home_template
page_template
paged_template
search_template
single_template

Advanced WordPress Filters

author_rewrite_rules

category_rewrite_rules

comments_rewrite_rules

create_user_query

date_rewrite_rules

found_posts

found_posts_query

get_editable_authors

gettext

get_next_post_join

get_next_post_sort

get_next_post_where

get_others_drafts

get_previous_post_join

get_previous_post_sort

get_previous_post_where

get_users_drafts

locale

mod_rewrite_rules

post_limits

posts_distinct

posts_fields

posts_groupby

posts_join_paged

posts_orderby

posts_request

post_rewrite_rules

root_rewrite_rules

page_rewrite_rules

posts_where_paged

posts_join

posts_where

query

query_string
query_vars

request

rewrite_rules_array

search_rewrite_rules

the_posts

excerpt_length

excerpt_more

update_user_query

wp_redirect

xmlrpc_methods

wp_mail_from

wp_mail_from_name

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WebDev -> WordPress -> Plugin Development: List of All Filters available

Links

Plugin API/Filter Reference

Contents

Post, Page, and Attachment (Upload) Filters

Database Reads

Database Writes

Comment, Trackback, and Ping Filters

Database Reads

Database Writes

Category and Term Filters

Database Reads

Database Writes

Link Filters

Date and Time Filters

Author and User Filters

Database Reads

Database Writes

Blogroll Filters

Blog Information and Option Filters

General Text Filters

Administrative Filters

Rich Text Editor Filters

Template Filters

Kubrick Filters

Registration & Login Filters

Redirect/Rewrite Filters

WP_Query Filters

Media Filters

Advanced WordPress Filters

Widgets

Admin Bar

Further Reading

Plugin API/Action Reference

Contents

Actions Run During a Typical Request

Actions Run During an Admin Page Request

Post, Page, Attachment, and Category Actions (Admin)

Taxonomy and Terms

Comment, Ping, and Trackback Actions

Blogroll Actions

Feed Actions

Template Actions

Administrative Actions

Dashboard “Right Now” Widget Actions

Advanced Actions

Word Press Plugin API/Filter Reference and cheetsheet.

Post, Page, and Attachment Filters

Database Reads

Database Writes

Comment, Trackback, and Ping Filters

Database Writes

Category Filters

Database Writes

Link Filters

Date and Time Filters

Author and User Filters

Database Reads

Database Writes

Blogroll Filters

Blog Information and Option Filters

General Text Filters

Administrative Filters

Rich Text Editor Filters

Template Filters

Advanced WordPress Filters

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