WordPress at a glance
action is not described

after_mu_upgrade action-hook . WP 3.0.0

Fires after the Multisite DB upgrade for each site is complete.

Usage

add_action( 'after_mu_upgrade', 'action_function_name_4460' );
function action_function_name_4460( $response ){
	// action...
}
$response(array/WP_Error)
The upgrade response array or WP_Error on failure.

Changelog

Since 3.0.0 Introduced.

Where the hook is called

In file: /wp-admin/network/upgrade.php
after_mu_upgrade
wp-admin/network/upgrade.php 111
do_action( 'after_mu_upgrade', $response );
wp-admin/admin.php 84
do_action( 'after_mu_upgrade', $response );

Where the hook is used (in WP core)

Usage not found!