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has_action › WordPress Function

Since2.5.0
已弃用n/a
› has_action ( $hook_name, $callback = false, $priority = false )
参数: (3)
  • (string) $hook_name The name of the action hook.
    Required: Yes
  • (callable|string|array|false) $callback Optional. The callback to check for. This function can be called unconditionally to speculatively check a callback that may or may not exist. Default false.
    Required: No
    默认: false
  • (int|false) $priority Optional. The specific priority at which to check for the callback. Default false.
    Required: No
    默认: false
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返回:
  • (bool|int) If `$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.
    If `$callback` and `$priority` are both provided, a boolean is returned
    for whether the specific function is registered at that priority.
定义在:
文档:
Change Log:
  • 6.9.0

Checks if any action has been registered for a hook.

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.


Related Functions: add_action, do_action, has_translation, did_action, doing_action

源码 

function has_action( $hook_name, $callback = false, $priority = false ) {
	return has_filter( $hook_name, $callback, $priority );
}