src/View/Helper/SearchHelper.php
protected function _setOptions(&$input, $param)
    {
        if ($param->hasOptions() && !isset($input['empty'])) {
            $input['empty'] = true;
        }

        return $input;
    }
protected function _setOptions(&$input, $param)
    {
        if ($param->hasOptions() && !isset($input['empty'])) {
            $input['empty'] = true;
        }

        return $input;
    }
protected function _setOptions ( & $ input , $ param ) { if ( $ param -> hasOptions ( ) && ! isset ( $ input [ 'empty' ] ) ) { $ input [ 'empty' ] = true ; } return $ input ; }
Set options for field

@param array $input Field options.
@param BaseParameter $param Form parameter.
@return array
Set options for field