framework/helpers/BaseHtml.php
protected static function activeBooleanInput($type, $model, $attribute, $options = [])
    {
        $name = isset($options['name']) ? $options['name'] : static::getInputName($model, $attribute);
        $value = static::getAttributeValue($model, $attribute);

        if (!array_key_exists('value', $options)) {
            $options['value'] = '1';
        }
        if (!array_key_exists('uncheck', $options)) {
            $options['uncheck'] = '0';
        } elseif ($options['uncheck'] === false) {
            unset($options['uncheck']);
        }
        if (!array_key_exists('label', $options)) {
            $options['label'] = static::encode($model->getAttributeLabel(static::getAttributeName($attribute)));
        } elseif ($options['label'] === false) {
            unset($options['label']);
        }

        $checked = "$value" === "{$options['value']}";

        if (!array_key_exists('id', $options)) {
            $options['id'] = static::getInputId($model, $attribute);
        }

        return static::$type($name, $checked, $options);
    }
protected static function activeBooleanInput($type, $model, $attribute, $options = [])
    {
        $name = isset($options['name']) ? $options['name'] : static::getInputName($model, $attribute);
        $value = static::getAttributeValue($model, $attribute);

        if (!array_key_exists('value', $options)) {
            $options['value'] = '1';
        }
        if (!array_key_exists('uncheck', $options)) {
            $options['uncheck'] = '0';
        } elseif ($options['uncheck'] === false) {
            unset($options['uncheck']);
        }
        if (!array_key_exists('label', $options)) {
            $options['label'] = static::encode($model->getAttributeLabel(static::getAttributeName($attribute)));
        } elseif ($options['label'] === false) {
            unset($options['label']);
        }

        $checked = "$value" === "{$options['value']}";

        if (!array_key_exists('id', $options)) {
            $options['id'] = static::getInputId($model, $attribute);
        }

        return static::$type($name, $checked, $options);
    }
Generates a boolean input
This method is mainly called by [[activeCheckbox()]] and [[activeRadio()]].
@param string $type the input type. This can be either `radio` or `checkbox`.
@param Model $model the model object
@param string $attribute the attribute name or expression. See [[getAttributeName()]] for the format
about attribute expression.
@param array $options the tag options in terms of name-value pairs.
See [[booleanInput()]] for details about accepted attributes.
@return string the generated input element
@since 2.0.9