function myftok($pathname, $proj_id)
{
    $st = @stat($pathname);
    if (!$st) {
        return -1;
    }
    $key = sprintf("%u", (($st['ino'] & 0xffff) | (($st['dev'] & 0xff) << 16) | (($proj_id & 0xff) << 24)));
    return $key;
}

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