PHP: Include library in files in different directories

Question

My project tree:

The library LibB is used in both AJAX and fileA , so I have respectively, in each file:

include_once "../Lib/LibB.txt"
include_once "Lib/LibB.txt"

The problem is that LibB depends on LibA , and whether I put an include that works for AJAX or that works for fileA :

 include_once "../LibA.txt"
 include_once "LibA.txt"

Is there a code that will work for both files?

Answer 1

set the path starting with the current directory

So from LibB.txt, use

include __DIR__ . '../LibA.txt';

Ref: http://php.net/manual/en/language.constants.predefined.php

or, assuming this is a website, you could use $_SERVER['DOCUMENT_ROOT'] before the file name

include $_SERVER['DOCUMENT_ROOT'] . '/LibA.txt';

Answer 2

call all the libraries in one file and call that file before calling your classes classes

ex. new file lib_list_request.txt
file list_classes.txt
file interface.txt

Like this, you only need to call every file once.