use Symfony\Component\DependencyInjection\ContainerBuilder; $container = new ContainerBuilder(); // Define some services and parameters // ... // Retrieve an array of container properties $properties = $container->getDefinition('service_id')->getProperties();In this example, we create a new ContainerBuilder and define some services and parameters. Then we retrieve an array of properties from the container for a specific service with the ID `service_id`. This method is useful for debugging and introspection of dependency injection containers. It allows developers to inspect the state of the container and its defined services. Overall, the Symfony\Component\DependencyInjection package library provides a robust set of tools for managing dependency injection in PHP applications.