Registers the update callback for a widget.

Parameters

$id_basestringrequired

The base ID of a widget created by extending WP_Widget.

$update_callbackcallablerequired

Update callback method for the widget.

$optionsarrayoptional

Widget control options. See wp_register_widget_control() .

More Arguments from wp_register_widget_control( … $options )

Array or string of control options.

• height int
  Never used. Default 200.
• width int
  Width of the fully expanded control form (but try hard to use the default width).
  Default 250.
• id_base int|string
  Required for multi-widgets, i.e widgets that allow multiple instances such as the text widget. The widget ID will end up looking like {$id_base}-{$unique_number}.

Default:array()

$paramsmixedoptional

Optional additional parameters to pass to the callback function when it’s called.

Source

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 ] );
		}
		return;
	}

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

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

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