has_action() WordPress Function
The has_action() function is used to check if a certain action has already been added to the current filter.
has_action( string $hook_name, callable|string|array|false $callback = false ) #
Checks if any action has been registered for a hook.
Description
When using the $callback argument, this function may return a non-boolean value that evaluates to false (e.g. 0), so use the === operator for testing the return value.
See also
- has_filter(): has_action() is an alias of has_filter().
Parameters
- $hook_name
(string)(Required)The name of the action hook.
- $callback
(callable|string|array|false)(Optional) The callback to check for. This function can be called unconditionally to speculatively check a callback that may or may not exist.
Default value: false
Return
(bool|int) If $callback is omitted, returns boolean for whether the hook has anything registered. When checking a specific function, the priority of that hook is returned, or false if the function is not attached.
More Information
Since this action is an alias of has_filter() , it also uses the global array $wp_filter that stores all of the filters / actions.
Source
File: wp-includes/plugin.php
function has_action( $hook_name, $callback = false ) {
return has_filter( $hook_name, $callback );
}
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Changelog
| Version | Description |
|---|---|
| 2.5.0 | Introduced. |