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Run PHP functions only when called from a specific subdirectory

I have an existing PHP application that I am trying to translate pbpBB into. phpBB has functions that have the same name as some of my existing functions. This causes the following error:

E_COMPILE_ERROR Error in file »functions.php« at line 121: Cannot redeclare redirect() (previously declared in /.../httpdocs/forum/includes/functions.php:2289)

I could rename the functions in the phpBB application, but this may cause problems with future updates. In my code, I would have to rename 512 function instances. Namespaces will require the same effort.

Is there a way to indicate that a particular function should only be used when called from a specific directory? For example, I would define redirect () as a function that will be used when calling from httpdocs / forum and another function with the same name elsewhere in the code that will be used when calling from / httpdocs / myapp. This seems to be practical, but I could not find such a solution.

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Source: https://habr.com/ru/post/1621374/

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