yii\behaviors\AttributeTypecastBehavior::typecastValue PHP Метод

    protected function typecastValue($value, $type)
    {
        if (is_scalar($type)) {
            if (is_object($value) && method_exists($value, '__toString')) {
                $value = $value->__toString();
            }
            switch ($type) {
                case self::TYPE_INTEGER:
                    return (int) $value;
                case self::TYPE_FLOAT:
                    return (double) $value;
                case self::TYPE_BOOLEAN:
                    return (bool) $value;
                case self::TYPE_STRING:
                    return (string) $value;
                default:
                    throw new InvalidParamException("Unsupported type '{$type}'");
            }
        }
        return call_user_func($type, $value);
    }