SCRIPT_FILENAME Vs. PATH_TRANSLATED

Hello,
I co-develop a php application with which a few users have trouble 
running. They get failed to open stream fatal errors.
I have been puzzled for some time and finally had one user allow me to 
see phpinfo() on his site.
What I found was that he had a blank $_SERVER['SCRIPT_FILENAME'] but 
had a value in $_SERVER['PATH_TRANSLATED'] , which is something I had 
never seen before. Using the later to build a path to the file solved 
the problem.
I think this issue is related to the use of fastCGI, since the few 
users I have helped show it enabled.
My cure was to write an if statement:
if translated then translated, else filename.
That works fine.
But curiosity is killing this cat.
Thus I trouble you folks.....
Happy New Year,
David

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