Question

has_action( string $tag,  callable|bool $function_to_check = false )

Check if any action has been registered for a hook.

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description

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参数

$tag

(string) (Required) The name of the action hook.

$function_to_check

(callable|bool) (Optional) The callback to check for.

Default value: false

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返回值

(bool|int) If $function_to_check 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. When using the $function_to_check 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.

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源代码

File: wp-includes/plugin.php

function has_action($tag, $function_to_check = false) {
	return has_filter($tag, $function_to_check);
}

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更新日志

Version	description
2.5.0	Introduced.

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相关函数

Uses

• wp-includes/plugin.php: has_filter()

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Used By

• wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::save_changeset_post()
• wp-includes/plugin.php: do_action_deprecated()
• wp-admin/includes/class-wp-screen.php: WP_Screen::render_meta_boxes_preferences()
• wp-admin/install.php: display_setup_form()
• wp-admin/includes/plugin.php: get_plugin_page_hook()
• wp-includes/functions.php: do_feed()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::preview()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::update()
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User Contributed Notes