什么是函数参数中的函数（）{\ Object $ object}中的\ Object

Question

I recall having seen this syntax before, and it seems valid as well.

function myFunction(\Object $object) { }

While I vaguely recall it to be just a helpful naming scheme for an otherwise dynamically-typed variable, I could not find (or rather not knowing what to search for) any reference to this kind of syntax.

Does anyone know better, and also any best practices regarding this syntax, if it is valid?

Answer 1

The backslash in this case is addressing the global namespace - classes and functions are placed there when they don't have a namespace definition. See also the manual section.