---
application: "Intervention Validation"
version: "Version 4"
status: "stable"
---

# Currency Code

## Validate ISO 4217 Currency Codes

Learn how to validate International Standard Book Numbers (ISBN) with the additional validation rules of Intervention Validation for your Laravel application.

> public Intervention\Validation\Rules\CurrencyCode::__construct(string $format = CurrencyCode::ALPHA, bool $strict = true)

The field under validation must be a valid [currency code](https://en.wikipedia.org/wiki/ISO_4217) according to ISO 4217.

#### Parameters

**format**

The currency code has two different formats `CurrencyCode::ALPHA` or `CurrencyCode::NUMERIC`. Select the format you want to check. Default `CurrencyCode::ALPHA`.

**strict**

If `strict` is `true`, the code must be passed in uppercase. Otherwise, the case doesn't matter.

### Example

```php
use Illuminate\Support\Facades\Validator;
use Intervention\Validation\Rules\CurrencyCode;

$validator = Validator::make($request->all(), [
    'attribute-key' => new CurrencyCode(),
]);
```

---

## Become a Sponsor

### Intervention Validation needs your help to keep the project going

Intervention Validation is non-commercial, open source licensed and completely free to use. The considerable
effort required to maintain and develop the software is only possible with the financial support
of sponsors. There are two ways in which you can support this project.

- Support via [GitHub Sponsors](https://github.com/sponsors/Intervention)
- Support via [Ko-Fi](https://ko-fi.com/interventionphp)