Reusable functions in mod admin.php hooks.php and inc.php files

[Sim]

What is the best approach to go about having any functions that can be used in those three files without rewriting the functions in each file and without editing any files outside the module.

@Dayo

[Dayo]

Just declare the function in module.hooks.php and you can use it everywhere 

Edited December 21, 2020 by Dayo

[Sim]

Anywhere as in any module?

[Dayo]

all *.hooks.php files are included in every page so yes you can put it in test.hooks.php and have access to it in test3.inc.php