Question

How to generate all unique 2-digit permutations from a given 3-digit number in PHP

Answer 1

function generate_2_digit_permutations_from_3_digit_number($threeDigitNumber) {
    $twoDigitPermutations = [];

    // Generate all two_digit_permutations of three_digit_number
    for ($i = 0; $i < strlen($threeDigitNumber); $i++) {
        for ($j = 0; $j < strlen($threeDigitNumber); $j++) {
            if ($i != $j) {
                $twoDigitPermutations[] = $threeDigitNumber[$i] . $threeDigitNumber[$j];
            }
        }
    }

    return $twoDigitPermutations;
}

$threeDigitNumber = "185";

$twoDigitPermutations = generate_2_digit_permutations_from_3_digit_number($threeDigitNumber);

echo implode(', ', $twoDigitPermutations);


/*
run:

18, 15, 81, 85, 51, 58

*/

 

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