PHP solution for https://www.hackerrank.com/challenges/minimum-swaps-2/

minimum-swaps-2.php

<?php

echo minimumSwaps($arr);

function minimumSwaps($arr) {
    $swaps = 0; # Default function value
    
    if (gettype($arr) !== 'array' || !count($arr)) {
        return $swaps;
    }
    
    $len = count($arr);
    
    while ($currValue = current($arr)) {
        $currKey = key($arr) + 1;
        if ($currKey !== $currValue) {
            $swaps += swap_arr_values($arr, key($arr), $currValue - 1);
        }
        else {
            next($arr);
        }
    }
    
    return $swaps;
}

function swap_arr_values(&$arr, $i, $j) {
    $temp = $arr[$j];
    $arr[$j] = $arr[$i];
    $arr[$i] = $temp;
    return 1;
}

?>