protected function build_input($data, array $fields = [] ){
        return parent::build_input($data, $fields).$this->length_helper($data);
    }
protected function build_input($data, array $fields = [] ){
        return parent::build_input($data, $fields).$this->length_helper($data);
    }
protected function build_input ( $ data , array $ fields = [ ] ) { return parent :: build_input ( $ data , $ fields ) . $ this -> length_helper ( $ data ) ; }
Return input field

@param mixed $data
@param array $fields
@return string
Return input field