autoloader.php

<?php declare(strict_types=1);
/**
 * Released under the MIT License.
 *
 * Copyright (c) 2018 Miha Vrhovnik <miha.vrhovnik@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * Try to find the composer generated autoload file
 *
 * @return boolean
 */
return function () {
    $dir = __DIR__; //on purpose so this also works under XDebug
    $files = [
        $dir . '/vendor/autoload.php', // stand-alone
        dirname($dir ,2) . '/autoload.php',  // when used as a dependency
    ];
    foreach ($files as $file) {
        if (is_file($file)) {
            require_once $file;

            return true;
        }
    }

    return false;
};