doing_filter ( $filter = null )
- (null|string) filter Optional. Filter to check. Defaults to null, which checks if any filter is currently being run.
- (bool) Whether the filter is currently in the stack.
- Introduced in WordPress: 3.9.0
- Deprecated in WordPress: —
Retrieve the name of a filter currently being processed.The function current_filter() only returns the most recent filter or action
being executed. did_action() returns true once the action is initially
This function allows detection for any filter currently being
executed (despite not being the most recent filter to fire, in the case of
hooks called from hook callbacks) to be verified.