# getSubject

Learn how to get the identified user ID.

This method provides the ID of the user the token identifies. When the token is anonymous, it returns `null`.

## Signature

This method has the following signature:

```php
public function getSubject(): ?string
```

This method returns the identified user ID, or `null` when the token is anonymous.

## Example

Here is a basic example of how to use this method:

```php
<?php
use Croct\Plug\Croct;

$croct = Croct::fromDotenv();
$token = $croct->getUserToken();

$userId = $token->getSubject();
```