How to write the path to the file?

Question

PHP

Something I'm confused.
Previously, everywhere I wrote relative paths like this

include_once ('file.php');
include_once ('folder/file.php');

And everything worked everywhere. Up crone. Crone says that there are no files in these paths.
And for him I wrote the path already like this. That given __DIR__ is an absolute path. And here I again need to include a couple of files in other files. And some of them will use crone. And part is not. How to write the path to the file?
include_once (__DIR__.'file.php');

Answer 1

relative paths should not be used.
There are 2 ways to specify the path to the php file
1. respectively, here the cron must access via http:// so that the apache server (nginx) creates this variable. 2.
dirname(__FILE__)

Answer 2

https://getcomposer.org/doc/04-schema.md#files