$filters
$filters : array
has(string $hook, callback $function_to_check = false) : integer|boolean
Check if any filter has been registered for a hook.
| string | $hook | The name of the filter hook. |
| callback | $function_to_check | Optional. If specified, return the priority of that function on this hook or false if not attached. |
Optionally returns the priority on that hook for the specified function.