troubleshooting Question

Determine from which file a function is called

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Xyptilon2Flag for China asked on
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I have a class with several functions, the class is included on many pages. Without adding a parameter to any of the functions, how can i determine (from within a function in the class) from which file the function was called.

I looked at the magical constant __FILE__ which is interesting, but returns the file of the class.
obviously $_SERVER['PHP_SELF'] and $_SERVER['SCRIPT_NAME'] are not only unreliable, they are also useless.

Any suggestions?
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