ActiveField.php
public function radioWithGap($options = [], $enclosedByLabel = true)
    {
        Html::addCssClass($options, $this->radioGapCssClass);
        return self::radio($options, $enclosedByLabel);
    }
public function radioWithGap($options = [], $enclosedByLabel = true)
    {
        Html::addCssClass($options, $this->radioGapCssClass);
        return self::radio($options, $enclosedByLabel);
    }
Creates radio button with gap
@see http://materializecss.com/forms.html#radio
@param array $options
@param bool|true $enclosedByLabel
@return $this