use Symfony\Component\DependencyInjection\Definition; // create a new definition object for a service $definition = new Definition('My\Class'); // get the class associated with the definition $class = $definition->getClass(); // output the class name echo $class; // outputs "My\Class"In this example, a new definition object is created for a service with the class "My\Class." The getClass method is then used to get the class name from the definition object, which is then outputted. The Symfony\Component\DependencyInjection component is a package library for Symfony that provides tools for managing dependency injection in PHP projects. It allows developers to define and manage service dependencies in a flexible and standardized way, making it easier to manage complex projects.