Autoloader.php

<?php
/**
 * This file is part of ObservableWorker.
 *
 * Licensed under The MIT License.
 * For full copyright and license information, please see the LICENSE.txt file.
 * Redistributions of files must retain the above copyright notice.
 *
 * @author    walkor<walkor@workerman.net>
 * @copyright walkor<walkor@workerman.net>
 * @license   http://www.opensource.org/licenses/mit-license.php MIT License
 *
 * @author    Pierre Lannoy <https://pierre.lannoy.fr/>
 * @copyright Pierre Lannoy <https://pierre.lannoy.fr/>
 * @link      https://github.com/Pierre-Lannoy/ObservableWorker
 *
 */
namespace ObservableWorker;

/**
 * Autoload.
 */
class Autoloader
{
    /**
     * Autoload root path.
     *
     * @var string
     */
    protected static $_autoloadRootPath = '';

    /**
     * Set autoload root path.
     *
     * @param string $root_path
     * @return void
     */
    public static function setRootPath($root_path)
    {
        self::$_autoloadRootPath = $root_path;
    }

    /**
     * Load files by namespace.
     *
     * @param string $name
     * @return boolean
     */
    public static function loadByNamespace($name)
    {
        $class_path = \str_replace('\\', \DIRECTORY_SEPARATOR, $name);
        if (\strpos($name, 'ObservableWorker\\') === 0) {
            $class_file = __DIR__ . \substr($class_path, \strlen('ObservableWorker')) . '.php';
        } else {
            if (self::$_autoloadRootPath) {
                $class_file = self::$_autoloadRootPath . \DIRECTORY_SEPARATOR . $class_path . '.php';
            }
            if (empty($class_file) || !\is_file($class_file)) {
                $class_file = __DIR__ . \DIRECTORY_SEPARATOR . '..' . \DIRECTORY_SEPARATOR . "$class_path.php";
            }
        }

        if (\is_file($class_file)) {
            require_once($class_file);
            if (\class_exists($name, false)) {
                return true;
            }
        }
        return false;
    }
}

\spl_autoload_register('\ObservableWorker\Autoloader::loadByNamespace');