daux.io/libs/bootstrap.php

<?php

function loadApp() {
    // Loaded as a dependency
    if (file_exists(__DIR__ . '/../../../autoload.php')) {
        return require_once __DIR__ . '/../../../autoload.php';
    }

    // Loaded in the project itself
    if (file_exists(__DIR__ . '/../vendor/autoload.php')) {
        return require_once __DIR__ . '/../vendor/autoload.php';
    }

    // Loaded in the project itself, when vendor isn't installed
    if (file_exists(__DIR__ . '/../daux.phar')) {
        define('PHAR_DIR', __DIR__ . '/..');

        return require_once 'phar://' . __DIR__ . '/../daux.phar/vendor/autoload.php';
    }
    
    throw new Exception('Impossible to load Daux, missing vendor/ or daux.phar');
}

$loader = loadApp();

if ($loader) {
    $ext = __DIR__ . '/../daux';
    if (is_dir(getcwd() . "/daux")) {
        $ext = getcwd() . "/daux";
    }
    
    $env = getenv('DAUX_EXTENSION');
    if ($env && is_dir($env)) {
        $ext = $env;
    }
    
    define('DAUX_EXTENSION', $ext);

    $loader->setPsr4("Todaymade\\Daux\\Extension\\", $ext);
}