Question

How to write an algorithm that adds the odd digits of one number to the end of a second number in PHP

Answer 1

function addOddDigits($n, $second_n) {
    $multiply = 1;
    $odd = 0;

    while ($n != 0) {
        if ($n % 2 != 0) {
            $odd += ($n % 10) * $multiply;
            $multiply *= 10;
        }

        $n = intval($n / 10);
    }

    return $second_n * $multiply + $odd;
}

$n = 12734;
$second_n = 100;

echo addOddDigits($n, $second_n);



/*
run:

100173

*/

 

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