Webmozart\PathUtil\Path::join PHP Method

    public static function join($paths)
    {
        if (!is_array($paths)) {
            $paths = func_get_args();
        }
        Assert::allString($paths, 'The paths must be strings. Got: %s');
        $finalPath = null;
        $wasScheme = false;
        foreach ($paths as $path) {
            $path = (string) $path;
            if ('' === $path) {
                continue;
            }
            if (null === $finalPath) {
                // For first part we keep slashes, like '/top', 'C:\' or 'phar://'
                $finalPath = $path;
                $wasScheme = strpos($path, '://') !== false;
                continue;
            }
            // Only add slash if previous part didn't end with '/' or '\'
            if (!in_array(substr($finalPath, -1), array('/', '\\'))) {
                $finalPath .= '/';
            }
            // If first part included a scheme like 'phar://' we allow current part to start with '/', otherwise trim
            $finalPath .= $wasScheme ? $path : ltrim($path, '/');
            $wasScheme = false;
        }
        if (null === $finalPath) {
            return '';
        }
        return self::canonicalize($finalPath);
    }

 /**
  * Rebuild the puli dependencies for symfony container.
  */
 protected function rebuild(InputInterface $input, OutputInterface $output)
 {
     $puli = new Puli(Path::join([getcwd(), NANBANDO_DIR]));
     $puli->start();
     /** @var EmbeddedComposerInterface $embeddedComposer */
     $embeddedComposer = $this->getApplication()->getEmbeddedComposer();
     $packageManager = $puli->getPackageManager();
     $io = new ConsoleIO($input, $output, $this->getApplication()->getHelperSet());
     $composer = $embeddedComposer->createComposer($io);
     $installationManager = $composer->getInstallationManager();
     $rootPackage = $composer->getPackage();
     $repository = $composer->getRepositoryManager()->getLocalRepository();
     $packages = [];
     foreach ($repository->getPackages() as $package) {
         $packages[$package->getName()] = $package;
     }
     foreach ($rootPackage->getRequires() as $require) {
         if (!array_key_exists($require->getTarget(), $packages)) {
             continue;
         }
         $packageManager->installPackage(Path::normalize($installationManager->getInstallPath($packages[$require->getTarget()])), $require->getTarget(), 'nanbando');
     }
     $filesystem = new Filesystem();
     $filesystem->remove(Path::join([getcwd(), NANBANDO_DIR, '.puli']));
     $discoveryManager = $puli->getDiscoveryManager();
     if (!$discoveryManager->hasRootTypeDescriptor('nanbando/bundle')) {
         $discoveryManager->addRootTypeDescriptor(new BindingTypeDescriptor(new BindingType('nanbando/bundle')), 0);
     }
     $discoveryManager->clearDiscovery();
     $discoveryManager->buildDiscovery();
     $filesystem = new Filesystem();
     $filesystem->remove(Path::join([getcwd(), NANBANDO_DIR, 'app', 'cache']));
 }