Field::setSetupName() method   
Set setup name from Fieldtype to apply when field is saved
Usage
// basic usage
$string = $field->setSetupName();
// usage with all arguments
$string = $field->setSetupName(string $setupName = null);Arguments
| Name | Type(s) | Description | 
|---|---|---|
$setupName (optional) | string | Setup name or omit to instead get the current value  | 
Return value
stringReturns current value
API reference based on ProcessWire core version 3.0.252