wp-includes/nav-menu.php:136Registers a navigation menu location for a theme.
$locationstring$descriptionstringfunction register_nav_menu( $location, $description ) { register_nav_menus( array( $location => $description ) );}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/nav-menu.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.