wp-includes/widgets.php:1092Set the sidebar widget option to update sidebars.
$sidebars_widgetsarrayfunction wp_set_sidebars_widgets( $sidebars_widgets ) { global $_wp_sidebars_widgets; // Clear cached value used in wp_get_sidebars_widgets(). $_wp_sidebars_widgets = null; if ( ! isset( $sidebars_widgets['array_version'] ) ) { $sidebars_widgets['array_version'] = 3; } update_option( 'sidebars_widgets', $sidebars_widgets );}Introduced in 2.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/widgets.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.