# Currency Providers

The Currency Provider allows you to grab all the known Currencies. It also has a `query` method to pass in `CurrencyProviderQuery`s to return various results.

## Basic Usage

### Loop over Currencies

```php
<?php
// @var CurrencyInterface $currency
foreach ($provider->getCurrencies() as $currency) {
    // Do something with each currency
}
```

### Check if Provider has a Currency

```php
// Check to see if the provider has the currency you are looking for
// @var bool $hasCurrency
$hasCurrency = $provider->hasCurrency('USD');
$hasCurrency = $provider->hasCurrency(Currency::USD());
```

### Getting Currency from the Provider

```php
// You can get a Currency like this. If the Currency does not exist
// it will throw an exception.
// @var CurrencyInterface $currency
$currency = $provider->getCurrency('USD');

$code      = $currency->getCurrencyCode(); // "USD"
$numCode   = $currency->getNumericCode(); // 840
$minorUnit = $currency->getMinorUnit(); // 2
```

## Currency Providers

### CurrencyProvider

The `CurrencyProvider` is usually the one that you will be using most of the time. It provides most of the [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) currencies.

```php
<?php
use SonsOfPHP\Component\Money\CurrencyProvider\CurrencyProvider;

$provider = new CurrencyProvider();
```

### XCurrencyProvider

The `XCurrencyProvider` gives you access to all of the "X" Currencies. For example, this provider is where you will find the Currency "XTS" which is reserved for use in testing.

```php
<?php
use SonsOfPHP\Component\Money\CurrencyProvider\XCurrencyProvider;

$provider = new XCurrencyProvider();
```

### ChainCurrencyProvider

The `ChainCurrencyProvider` lets you use multiple Currency Providers together at once. It does not provide any currencies itself.

```php
<?php
use SonsOfPHP\Component\Money\CurrencyProvider\ChainCurrencyProvider;
use SonsOfPHP\Component\Money\CurrencyProvider\CurrencyProvider;
use SonsOfPHP\Component\Money\CurrencyProvider\XCurrencyProvider;

$provider = new ChainCurrencyProvider([
    new CurrencyProvider(),
    new XCurrencyProvider(),
]);

// You can add additional providers as well
$provider->addProvier(new MyCustomCurrencyProvider());
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.sonsofphp.com/components/money/currency-providers.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.