Rather put the config.php and function.php in the same folder. Be it include or includes. The app will still work if it is in different folders, you then have to put this at the top of each page:
Language: PHP
include ("includes/config.php");
include ("include/func.php");
So it is much better to have it like this:
Language: PHP
require ("include/config.php");
include ("include/func.php");
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Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning...