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register_widget( string|WP_Widget $widget )

Registers a WP_Widget widget

$widget: (string|WP_Widget) (Required) Either the name of a WP_Widget subclass or an instance of a WP_Widget subclass.

function register_widget( $widget ) {
	global $wp_widget_factory;

	$wp_widget_factory->register( $widget );
}

Uses	Description
wp-includes/class-wp-widget-factory.php: WP_Widget_Factory::register()	Registers a widget subclass.

Used By	Description
wp-includes/widgets.php: wp_widgets_init()	Registers all of the default WordPress widgets on startup.

Version	Description
4.6.0	Updated the `$widget` parameter to also accept a WP_Widget instance object instead of simply a `WP_Widget` subclass name.
2.8.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/register_widget