public function field($field, $value = null)
{
if (DevValue::isNotEmpty($value)) {
$this->_data[$field] = $value;
} else {
$value = isset($this->_data[$field]) && DevValue::isNotEmpty($this->_data[$field]) ? $this->_data[$field] : null;
}
return $value;
}
public function _isValid($allow_zero = true)
{
$number = $this->_data;
return is_numeric($number) && (DevValue::isNotEmpty($number) && $number != 0 || $allow_zero);
}
