wp-includes/class-wp-widget.php:599Saves the settings for all instances of the widget class.
$settingsarray public function save_settings( $settings ) { $settings['_multiwidget'] = 1; update_option( $this->option_name, $settings ); }Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-widget.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.