sign($url); echo $signed_url; ?>In this example, we need to install the `symfony/http-kernel` package and include the `UriSigner` class from it. We then create an instance of `UriSigner` by passing in a secret key. We use the `abs_site()` function to get the absolute URL of the current site, and use the `sign()` method of the `UriSigner` class to sign the URL with the secret key. The signed URL is then printed. Package library: `symfony/http-kernel`