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
-
(Required) The name of the action hook.
- $callback
-
(Optional) The callback to check for.<br> This function can be called unconditionally to speculatively check a callback that may or may not exist.
Default value: false
Return
(bool|int) If $callback
is omitted, returns boolean for whether the hook has anything registered. When checking a specific function, the priority of that hook is returned, or false if the function is not attached.
Source
File: wp-includes/plugin.php
function has_action($tag, $function_to_check = false) {
return has_filter($tag, $function_to_check);
}
Changelog
Version | Description |
---|---|
2.5.0 | Introduced. |