real_file()
void|string real_file(string path, object id)
The real_file() method translates the path of a file
in the modules name space to the path to the file in the real file
system. path is the path to the file in the modules name
space. id is the request information object.
If the file could not be found, or the file doesn't exist on a real
file system, zero should be returned. Only location modules that
access server files from a real file system need implement this
method.
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