class SortableDirectoryIterator implements IteratorAggregate
{
 
    private $_storage;
 
    public function __construct($path)
    {
    $this->_storage = new ArrayObject();
 
    $files = new DirectoryIterator($path);
    foreach ($files as $file) {
        $this->_storage->offsetSet($file->getFilename(),$file->getFileInfo());
    }
    $this->_storage->uksort(
        function ($a,$b) {
            return strcmp($a,$b);
        }
    );
    }
 
    public function getIterator()
    {
    return $this->_storage->getIterator();
    }
 
}