current_filter(): string|false
- Since
- 2.5.0
- Source
wp-includes/plugin.php:370
Compatibility
- WordPress
- since 2.5.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Return value
string|false- Hook name of the current filter, false if no filter is running.
Performance profile
How much work a call to current_filter() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 5
- Plugin surface
- None
- Called by
- 17
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5. The body compiles to 5.
Nothing here hands control to plugin code.
17 places in core call this, so the cost is paid more often than your own code shows.
What one call costs · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost current_filter() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 5 | end() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 5 instructions, 5 executed per call, 0 branches. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Used by · 17
- Language_Pack_Upgrader::bulk_upgrade()Upgrades several language packs at once.
- WP_Customize_Widgets::capture_filter_pre_get_option()Pre-filters captured option values before retrieving.
- _make_clickable_rel_attr()Helper function used to build the "rel" attribute for a URL when creating an anchor using make_clickable().
- capital_P_dangit()Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence).
- current_action()Retrieves the name of the current action hook.
- display_plugins_table()Displays plugin content based on plugin list.
- get_the_generator()Creates the generator XML or Comment for RSS, ATOM, etc.
- is_main_query()Determines whether the query is the main query.
- twentyfourteen_contextual_help()Adds contextual help to the Themes and Post edit screens.
- wp_connectors_sanitize_application_password_credentials()Sanitizes stored application-password credentials for a connector.
- wp_deregister_script()Removes a registered script.
- wp_filter_content_tags()Filters specific tags in post content and modifies their markup.
Show all 17
- wp_filter_kses()Sanitize content with allowed HTML KSES rules.
- wp_get_theme_preview_path()Filters the blog option to return the path for the previewed theme.
- wp_kses_data()Sanitize content with allowed HTML KSES rules.
- wp_update_plugins()Checks for available updates to plugins based on the latest versions hosted on WordPress.org.
- wp_update_themes()Checks for available updates to themes based on the latest versions hosted on WordPress.org.
Source code
function current_filter() { global $wp_current_filter; return end( $wp_current_filter );}Changelog
Introduced in 2.5.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
string to string|false.verified against sourceAbout this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-includes/plugin.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.