wp-includes/class-wp-site.php:208Converts an object to array.
array public function to_array() { return get_object_vars( $this ); }Introduced in 4.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-site.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.