What does a \ (backslash) do in PHP (5.3+)?

Question

What does a \\ do in PHP?

For example, CSRF4PHP has \\FALSE, \\session_id, and \\Exception:

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Answer 1

To clarify potential confusion:

The backslash does not imply class inheritance.

In the following, Animal, Dog, Shepherd don't have to be classes, but simply namespaces. Meaning something used to group names together to avoid naming collisions.

$myDog = new \Animal\Dog\Shepherd\GermanShepherd();

The leading \ means Animal was declared in the global scope.