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    An alternative to using substr() as an lvalue is to
    specify the replacement string as the 4th argument.
    This allows you to replace parts of the EXPR and
    return what was there before in one operation,
    just as you can with splice().

    while ($txt = substr($hex, 0, 32)) {
        substr($hex, 0, 32) = "";
        print "'$txt'\n";
    }