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RecursiveCallbackFilterIterator example

    public function load(mixed $path, string $type = null): ?RouteCollection
    {
        if (!is_dir($dir = $this->locator->locate($path))) {
            return parent::supports($path, $type) ? parent::load($path, $type) : new RouteCollection();
        }

        $collection = new RouteCollection();
        $collection->addResource(new DirectoryResource($dir, '/\.php$/'));
        $files = iterator_to_array(new \RecursiveIteratorIterator(
            new \RecursiveCallbackFilterIterator(
                new \RecursiveDirectoryIterator($dir, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS),
                fn (\SplFileInfo $current) => !str_starts_with($current->getBasename(), '.')
            ),
            \RecursiveIteratorIterator::LEAVES_ONLY
        ));
        usort($files, fn (\SplFileInfo $a, \SplFileInfo $b) => (string) $a > (string) $b ? 1 : -1);

        foreach ($files as $file) {
            if (!$file->isFile() || !str_ends_with($file->getFilename(), '.php')) {
                continue;
            }

$loader = clone $this;
        $loader->currentDirectory = $currentDirectory;

        return $loader;
    }

    private function loadFromDirectory(string $directory, string $psr4Prefix): RouteCollection
    {
        $collection = new RouteCollection();
        $collection->addResource(new DirectoryResource($directory, '/\.php$/'));
        $files = iterator_to_array(new \RecursiveIteratorIterator(
            new \RecursiveCallbackFilterIterator(
                new \RecursiveDirectoryIterator($directory, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS),
                fn (\SplFileInfo $current) => !str_starts_with($current->getBasename(), '.')
            ),
            \RecursiveIteratorIterator::SELF_FIRST
        ));
        usort($files, fn (\SplFileInfo $a, \SplFileInfo $b) => (string) $a > (string) $b ? 1 : -1);

        /** @var \SplFileInfo $file */
        foreach ($files as $file) {
            if ($file->isDir()) {
                $collection->addCollection($this->loadFromDirectory($file->getPathname(), $psr4Prefix.'\\'.$file->getFilename()));

if (!is_dir($path)) {
                    continue;
                }
                if ($this->forExclusion && (null === $regex || preg_match($regex, substr(str_replace('\\', '/', $path), $prefixLen)))) {
                    yield $path => new \SplFileInfo($path);
                    continue;
                }
                if (!($this->recursive || null !== $regex) || isset($this->excludedPrefixes[str_replace('\\', '/', $path)])) {
                    continue;
                }
                $files = iterator_to_array(new \RecursiveIteratorIterator(
                    new \RecursiveCallbackFilterIterator(
                        new \RecursiveDirectoryIterator($path, \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS),
                        fn (\SplFileInfo $file, $path) => !isset($this->excludedPrefixes[$path = str_replace('\\', '/', $path)])
                            && (null === $regex || preg_match($regex, substr($path, $prefixLen)) || $file->isDir())
                            && '.' !== $file->getBasename()[0]
                    ),
                    \RecursiveIteratorIterator::LEAVES_ONLY
                ));
                uksort($files, 'strnatcmp');

                foreach ($files as $path => $info) {
                    if ($info->isFile()) {

public static function scanDirectory($namespace_prefix, $path) {
    if (substr($namespace_prefix, -1) !== '\\') {
      throw new \InvalidArgumentException("Namespace prefix for $path must contain a trailing namespace separator.");
    }
    $flags = \FilesystemIterator::UNIX_PATHS;
    $flags |= \FilesystemIterator::SKIP_DOTS;
    $flags |= \FilesystemIterator::FOLLOW_SYMLINKS;
    $flags |= \FilesystemIterator::CURRENT_AS_SELF;
    $flags |= \FilesystemIterator::KEY_AS_FILENAME;

    $iterator = new \RecursiveDirectoryIterator($path, $flags);
    $filter = new \RecursiveCallbackFilterIterator($iterator, function D$current, $file_name, $iterator) {
      if ($iterator->hasChildren()) {
        return TRUE;
      }
      // We don't want to discover abstract TestBase classes, traits or       // interfaces. They can be deprecated and will call @trigger_error()       // during discovery.       return substr($file_name, -4) === '.php' &&
        substr($file_name, -12) !== 'TestBase.php' &&
        substr($file_name, -9) !== 'Trait.php' &&
        substr($file_name, -13) !== 'Interface.php';
    });