wp_delete_site action-hook . WP 5.1.0

Fires once a site has been deleted from the database.

Usage

add_action( 'wp_delete_site', 'action_function_name_2608' );
function action_function_name_2608( $old_site ){
	// action...
}

$old_site(WP_Site)

Deleted site object.

Where the hook is called

do_action( 'wp_delete_site', $old_site );

Where the hook is used (in WP core)

add_action( 'wp_delete_site', 'wp_maybe_update_network_site_counts_on_update', 10, 1 );