./lib/PhpOffice/PhpWord/Autoloader.php

<?php

namespace PhpOffice\PhpWord;

/**
 * Custom Autoloader for PHPWord
 */
class Autoloader
{
    const BASE_DIR = __DIR__;

    /**
     * Register the autoloader
     */
    public static function register()
    {
        spl_autoload_register([new self, 'autoload']);
    }

    /**
     * Autoload function
     */
    public static function autoload($class)
    {
        $prefix = "PhpOffice\\PhpWord\\";
        $baseDir = self::BASE_DIR . DIRECTORY_SEPARATOR;

        if (strpos($class, $prefix) !== 0) {
            return false;
        }

        $relativeClass = substr($class, strlen($prefix));
        $file = $baseDir . str_replace("\\", DIRECTORY_SEPARATOR, $relativeClass) . ".php";

        if (file_exists($file)) {
            require_once $file;
        } else {
            die("Class $class not found in $file");
        }
    }
}