WP_Hook::has_filter( string $tag = '', callable|bool $function_to_check = false )
Checks if a specific action has been registered for this hook.
Description Description
Parameters Parameters
- $tag
-
(string) (Optional) The name of the filter hook. Used for building the callback ID when SPL is not available.
Default value: ''
- $function_to_check
-
(callable|bool) (Optional) The callback to check for.
Default value: false
Return Return
(bool|int) The priority of that hook is returned, or false if the function is not attached.
Source Source
File: wp-includes/class-wp-hook.php
public function has_filter( $tag = '', $function_to_check = false ) {
if ( false === $function_to_check ) {
return $this->has_filters();
}
$function_key = _wp_filter_build_unique_id( $tag, $function_to_check, false );
if ( ! $function_key ) {
return false;
}
foreach ( $this->callbacks as $priority => $callbacks ) {
if ( isset( $callbacks[ $function_key ] ) ) {
return $priority;
}
}
return false;
}
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Changelog Changelog
| Version | Description |
|---|---|
| 4.7.0 | Introduced. |