php - How to include those files which internally include other files?

This is my file structure

\+-- config
|   +-- config1.php
|   +-- config2.php
\+-- test
|   +-- test1
|      +-- innerRunner.php
\+-- outerRunner.php
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this isconfig1.php

<?php
require_once 'config/config2.php';
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this isconfig2.php

<?php
function runConfig2(){
    echo "control in config2";
}
runConfig2();
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this isinnerRunner.php

<?php
require_once("../../config/config1.php");
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this isouterRunner.php

<?php
require_once("config/config1.php");
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When i exceute outerRunner.php then everything works fine but when i run innerRunner.php it shows error

Warning: require_once(config/config2.php): Failed to open stream: No such file or directory in /var/www/config/config1.php on line 2

Fatal error: Uncaught Error: Failed opening required 'config/config2.php' (include_path='.:/usr/local/lib/php') in /var/www/config/config1.php:2 Stack trace: #0 /var/www/test/test1/innerRunner.php(2): require_once() #1 {main} thrown in /var/www/config/config1.php on line 2
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Can anyone help me with this?
Here is the link of sandbox for the same: Link

PS : I can't make any changes in config1 or config2, i need to do something with innerRunner.php only.

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