# hasPrivateKey

Learn how to check whether the API key can sign user tokens.

This method reports whether the API key carries a private key for signing user tokens.

## Signature

This method has the following signature:

```php
public function hasPrivateKey(): bool
```

This method returns `true` when the key carries a private key for signing user tokens, and `false` otherwise.

## Example

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

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

$apiKey = ApiKey::parse('f47ac10b-58cc-4372-a567-0e02b2c3d479');

if ($apiKey->hasPrivateKey()) {
    // The key can sign user tokens.
}
```