Contao\CoreBundle\Command\SymlinksCommand::filterNestedPaths PHP Method

    private function filterNestedPaths(Finder $finder, $prepend)
    {
        $parents = [];
        $files = iterator_to_array($finder);
        /** @var SplFileInfo $file */
        foreach ($files as $key => $file) {
            $path = rtrim(strtr($prepend . '/' . $file->getRelativePath(), '\\', '/'), '/');
            $chunks = explode('/', $path);
            array_pop($chunks);
            $parent = implode('/', $chunks);
            if (in_array($parent, $parents)) {
                $this->rows[] = [sprintf('<fg=yellow;options=bold>%s</>', '\\' === DIRECTORY_SEPARATOR ? 'WARNING' : '!'), $this->webDir . '/' . $path, sprintf('<comment>Skipped because %s will be symlinked.</comment>', $parent)];
                unset($files[$key]);
            }
            $parents[] = $path;
        }
        return array_values($files);
    }