Question

How to check if a number has at least one pair of duplicate digits next to each other in PHP

Answer 1

function has_duplicate_digits($n) {
    $digits = str_split($n);
    
    for ($i = 0; $i < count($digits) - 1; $i++) {
        if ($digits[$i] == $digits[$i + 1]) {
            return true;
        }
    }

    return false;
}

$n = 32558774;

echo has_duplicate_digits($n) ? "true" : "false";




/*
run:

true

*/

 

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