PHP Recursive dir size with iterator object

public function getDirSize($dir, $format = true)
    {
        $dir_iterator = new RecursiveDirectoryIterator($dir);
        $iterator = new RecursiveIteratorIterator($dir_iterator, RecursiveIteratorIterator::SELF_FIRST);
        $size = 0;
        foreach ($iterator as $file) {
            $size += $file->getSize();
        }

        if ($format) {
            if ($size / 1048576 > 1) {
                return round($size / 1048576, 1) . ' MB';

                // if the total size is bigger than 1 KB
            } elseif ($size / 1024 > 1) {
                return round($size / 1024, 1) . ' KB';

                // else return the filesize in bytes
            } else {
                return round($size, 1) . ' bytes';
            }
        } else {
            // return the total filesize in bytes
            return $size;
        }
    }

usage:


$size = getDirSize('/dir/to/get/size/');

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