$userExtension $userExtension : mixed Protected variable to hold User extension. Type mixed — Default null.
$instance $instance : mixed Private static variable to hold the single instance of the class. Type mixed — Default null
instance() instance() : \MainWP\Dashboard\MainWP_DB_Common Method instance() Create public static instance. Returns \MainWP\Dashboard\MainWP_DB_Common
get_available_update_siteids() get_available_update_siteids() : array Get child site ids that have available updates. Returns array — $site_ids Array of Child Site ID's that have updates.