Filename Auto Increment

function newName($path, $filename) {
    $res = "$path/$filename";
    if (!file_exists($res)) return $res;
    $fnameNoExt = pathinfo($filename,PATHINFO_FILENAME);
    $ext = pathinfo($filename, PATHINFO_EXTENSION);

    $i = 1;
    while(file_exists("$path/$fnameNoExt ($i).$ext")) $i++;
    return "$path/$fnameNoExt ($i).$ext";
}