wp-includes/widgets.php:1115Retrieves default registered sidebars list.
arrayfunction wp_get_widget_defaults() { global $wp_registered_sidebars; $defaults = array(); foreach ( (array) $wp_registered_sidebars as $index => $sidebar ) { $defaults[ $index ] = array(); } return $defaults;}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.