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What is the output of the following function?

    function &find_variable(&$one, &$two, &$three) {
        if ($one > 10 && $one < 20) return $one;
        if ($two > 10 && $two < 20) return $two;
        if ($three > 10 && $three < 20) return $three;
    }
    $one = 2;
    $two = 20;
    $three = 15;
    $var = &find_variable($one, $two, $three);
    $var++;
    echo "1: $one, 2: $two, 3: $three";
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