addNamespaces(array( 'MyNamespace' => '/path/to/my/namespace' )); // Load a class from the namespace $obj = new \MyNamespace\MyClass();In this example, the ClassLoader is being used to add a namespace called 'MyNamespace'. It is given a path to the directory where the namespace files are stored. The ClassLoader will automatically search for and load the corresponding class file when the `MyNamespace\MyClass()` constructor is called. The package library being used in this example is not explicitly stated, but it could be any package or library that uses namespaces to organize its code. The addNamespaces method is a common way to configure a class loader for these types of packages or libraries.