class SortableDirectoryIterator extends RecursiveDirectoryIterator
{
    /**
     * \ArrayObject
     */
    private $dirArray;

    public function __construct(string $path)
    {
        parent::__construct($path);
        $this->dirArray = new \ArrayObject();
        foreach($this as $item) {
            $this->dirArray->append( $item );
        }
        $this->dirArray->uasort( function ($fileObj1, $fileObj2) {
            if ($fileObj1->getMTime() == $fileObj2->getMTime()) {
                return 0;
            }
            return ($fileObj1->getMTime() < $fileObj2->getMTime()) ? -1 : 1;
        } );
    }

    public function getIterator()
    {
        return $this->dirArray->getIterator();
    }
}