php - is there a way to have a namespace with a space in it?

One of the directories in my app has the nameweb services. For the classes contained in that folder I have tried declaring the namespace various ways, including:

namespace web services;
namespace 'web services';
namespace [web services];
namespace {web services};
Copy code

...none of which work. VS Code gives warnings on each of these.

The multitude of online documentation/forum posts/blogs regarding PHP namespaces do not mention anything about whether or not spaces are allowed; though all of the examples they show do not have any namespaces that contain spaces. Is it possible for a namespace to contain a space so it matches the app's directory structure?

PHP 7.4.13 is being used for this app.

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