__return_empty_string() – Returns an empty string.
__return_false() – Returns false.
__return_null() – Returns null.
__return_true() – Returns true.
__return_zero() – Returns 0.
_crop_image_resource() – Crops an image resource. Internal use only.
_deep_replace() – Perform a deep string replace operation to ensure the values in $search are no longer present
_disable_reqs() –
_fetch_remote_file() – Retrieve URL headers and content using WP HTTP Request API.
_flip_image_resource() – Flips an image resource. Internal use only.
_get_random_header_data() – Get random header image data from registered images in theme.
_get_wptexturize_shortcode_regex() – Retrieve the regular expression for shortcodes.
_get_wptexturize_split_regex() – Retrieve the combined regular expression for HTML and shortcodes.
_image_get_preview_ratio() – Image preview ratio. Internal use only.
_list_meta_row() – Outputs a single row of public meta data in the Custom Fields meta box.
_oembed_rest_pre_serve_request() – Hooks into the REST API output to print XML instead of JSON.
_post_format_request() – Filters the request to allow for the format prefix.
_redirect_to_about_wordpress() – Redirect to the About WordPress page after a successful upgrade.
_register_widget_form_callback() – Registers the form callback for a widget.
_register_widget_update_callback() – Registers the update callback for a widget.
_relocate_children() – This was once used to move child posts to a new parent.
_remove_qs_args_if_not_in_url() – Removes arguments from a query string if they are not present in a URL DO NOT use this in plugin code.
_remove_theme_support() – Do not use. Removes theme support internally, ignorant of the blacklist.
_reset_front_page_settings_for_post() – Reset the page_on_front, show_on_front, and page_for_post settings when a linked page is deleted or trashed.
_response_to_rss() – Retrieve
_restore_wpautop_hook() – If do_blocks() needs to remove wp_autop() from the `the_content` filter, this re-adds it afterwards, for subsequent `the_content` usage.
_rotate_image_resource() – Returns an image resource. Internal use only.
_upgrade_422_remove_genericons() – Cleans up Genericons example files.
_wp_dashboard_recent_comments_row() – Outputs a row for the Recent Comments widget.
_wp_get_attachment_relative_path() – Get the attachment path relative to the upload directory.
_wp_get_post_revision_version() – Gets the post revision version.
_wp_personal_data_removal_page() – Personal data anonymization.
_wp_post_revision_data() – Returns a post array ready to be inserted into the posts table as a post revision.
_wp_post_revision_field_$field – filter
_wp_post_revision_fields – filter
_wp_post_revision_fields() – Determines which fields of posts are to be saved in revisions.
_wp_privacy_account_request_confirmed_message() – Return request confirmation message HTML.
_wp_privacy_account_request_confirmed() – Update log when privacy request is confirmed.
_wp_privacy_action_request_types() – Get all user privacy request types.
_wp_privacy_completed_request() – Marks a request as completed by the admin and logs the current timestamp.
_wp_privacy_hook_requests_page() – Add requests pages.
_wp_privacy_requests_screen_options() – Add options for the privacy requests screens.
_wp_privacy_resend_request() – Resend an existing request and return the result.
_wp_privacy_send_request_confirmation_notification() – Notify the site administrator via email when a request is confirmed.
_wp_put_post_revision – action
_wp_put_post_revision() – Inserts post data into the posts table as a post revision.
_wp_register_meta_args_whitelist() – Filter out `register_meta()` args based on a whitelist.
_wp_relative_upload_path – filter
_wp_relative_upload_path() – Return relative path to an uploaded file.
_wp_remove_unregistered_widgets() – Compares a list of sidebars with their widgets against a whitelist.
_wp_render_title_tag() – Displays title tag with content.
_wp_upgrade_revisions_of_post() – Upgrade the revisions author, add the current post as a revision and set the revisions version to 1
$adjacent_post_rel_link – filter
$boundary_post_rel_link – filter
$permastructname_rewrite_rules – filter
$taxonomy_$field_rss – filter
$taxonomy_row_actions – filter
add_rewrite_endpoint() – Add an endpoint, like /trackback/.
add_rewrite_rule() – Adds a rewrite rule that transforms a URL structure to a set of query vars.
add_rewrite_tag() – Add a new rewrite tag (like %postname%).
add_role() – Add role, if it does not exist.
add_term_relationship – action
add_user_role – action
added_term_relationship – action
adjacent_posts_rel_link_wp_head() – Displays relational links for the posts adjacent to the current post for single post pages.
adjacent_posts_rel_link() – Displays the relational links for the posts adjacent to the current post.
admin_action_$_REQUESTaction – action
admin_referrer_policy – filter
after_password_reset – action
after_plugin_row – action
after_plugin_row_$plugin_file – action
after_plugin_row_$this – action
after_theme_row – action
after_theme_row_$stylesheet – action
after_theme_row_$theme – action
allow_password_reset – filter
allowed_http_request_hosts() – Whitelists allowed redirect hosts for safe HTTP requests as well.
allowed_redirect_hosts – filter
AMFReader::readArray() –
AMFReader::readBoolean() –
AMFReader::readData() –
AMFReader::readDate() –
AMFReader::readDouble() –
AMFReader::readLongString() –
AMFReader::readMixedArray() –
AMFReader::readObject() –
AMFReader::readString() –
AMFReader::readTypedObject() –
AMFReader::readXML() –
AMFStream::read() –
AMFStream::readByte() –
AMFStream::readDouble() –
AMFStream::readInt() –
AMFStream::readLong() –
AMFStream::readLongUTF() –
AMFStream::readUTF() –
apply_filters_ref_array() – Execute functions hooked on a specific filter hook, specifying arguments in an array.
array_replace_recursive() – PHP-agnostic version of {@link array_replace_recursive()}.
auth_redirect – action
auth_redirect_scheme – filter
auth_redirect() – Checks if a user is logged in, if not it redirects them to the login page.
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