WP_Widget_Factory::_register_widgets()

Source

public function _register_widgets() {
	global $wp_registered_widgets;
	$keys       = array_keys( $this->widgets );
	$registered = array_keys( $wp_registered_widgets );
	$registered = array_map( '_get_widget_id_base', $registered );

	foreach ( $keys as $key ) {
		// Don't register new widget if old widget with the same id is already registered.
		if ( in_array( $this->widgets[ $key ]->id_base, $registered, true ) ) {
			unset( $this->widgets[ $key ] );
			continue;
		}

		$this->widgets[ $key ]->_register();
	}
}

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