What's about the double underscore in front of methods?

Hi everybody

I stumbled over some methods in a CakePHP app I've taken over from
somebody that begin with a double underscoore, e.g.:

__getPageTitle(...)

I'm not sure what's the philosophy about that? I know one underscore
as the convention for private methods, but two underscores?

Thanks a lot for informations.
Joshua

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