"Best" way to include files

Question

How to include (require) files so that it is the least dependent of the position of the include in question :)
For example: How to include header file in various different files?
Is only bad thing about using full path that it would be harder to change from linux to windows (for example)?

P.S. First post :)

Answer 1

Make a config.inc.php file. put all of your long paths in it. in your layout files instead of passing loooong paths. pass variable from config.inc.php

P.S. you can give any name to your config file. just don't forget the ".php" at the end 😂😂😂

Answer 2

Thanks :) I already did it like that, though without .inc part :)
Made a Locations class and const array in it with full paths for values and short description for keys.