Util.php

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<?php

declare(strict_types=1);

namespace ILIAS\Filesystem\Provider\FlySystem;

class Util // extends \League\Flysystem\Util
{
    public static function normalizeRelativePath(string $path): string
    {
        $path = preg_replace("#\\\\(?!['\\\])#m", '/', $path); // this only replaces backslashes
        $path = preg_replace('#\p{C}+#u', '', (string) $path);
        $parts = [];

        foreach (explode('/', (string) $path) as $part) {
            switch ($part) {
                case '':
                case '.':
                    break;

                case '..':
                    if (empty($parts)) {
                        throw new \LogicException(
                            'Path is outside of the defined root, path: [' . $path . ']'
                        );
                    }
                    array_pop($parts);
                    break;

                default:
                    $parts[] = $part;
                    break;
            }
        }

        return implode('/', $parts);
    }
}