$instance : mixed
Public static variable to hold the single instance of the class.
Check if themes have been abandoned.
cleanup_deactivation(boolean $del = true)
Un-schedules all events attached to the hook with the specified arguments.
On success an integer indicating number of events un-scheduled (0 indicates no events were registered with the hook and arguments combination), false if un-scheduling one or more events fail.
Whether or not to delete the transient data. Default: true.