protected function _emptyValue($value)
    {
        if ($value === true) {
            return ['' => ''];
        }
        if (is_scalar($value)) {
            return ['' => $value];
        }
        if (is_array($value)) {
            return $value;
        }

        return [];
    }
protected function _emptyValue($value)
    {
        if ($value === true) {
            return ['' => ''];
        }
        if (is_scalar($value)) {
            return ['' => $value];
        }
        if (is_array($value)) {
            return $value;
        }

        return [];
    }
protected function _emptyValue ( $ value ) { if ( $ value === true ) { return [ '' => '' ] ; } if ( is_scalar ( $ value ) ) { return [ '' => $ value ] ; } if ( is_array ( $ value ) ) { return $ value ; } return [ ] ; }
Generate the empty value based on the input.

@param string|bool|array $value The provided empty value.
@return array The generated option key/value.
Generate the empty value based on the input .