_register_widget_update_callback( string $id_base, callable $update_callback, array $options = array(), mixed $params )

Registers the update callback for a widget.

Description Description

Parameters Parameters


(string) (Required) The base ID of a widget created by extending WP_Widget.


(callable) (Required) Update callback method for the widget.


(array) (Optional) Widget control options. See wp_register_widget_control().

Default value: array()


(mixed) (Optional) additional parameters to pass to the callback function when it's called.

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Source Source

File: wp-includes/widgets.php

function _register_widget_update_callback( $id_base, $update_callback, $options = array(), ...$params ) {
	global $wp_registered_widget_updates;

	if ( isset( $wp_registered_widget_updates[ $id_base ] ) ) {
		if ( empty( $update_callback ) ) {
			unset( $wp_registered_widget_updates[ $id_base ] );

	$widget = array(
		'callback' => $update_callback,
		'params'   => $params,

	$widget                                   = array_merge( $widget, $options );
	$wp_registered_widget_updates[ $id_base ] = $widget;

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Changelog Changelog

Version Description
5.3.0 Formalized the existing and already documented ...$params parameter by adding it to the function signature.
2.8.0 Introduced.

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