Hackerrank minimum Swaps

minimumSwaps.php

<?php

function minimumSwaps($arr) {
    $swaps = 0;
    for($i = 0; $i < count($arr); $i++) {
        while($arr[$i] != $i + 1) {
            $temp = $arr[$i];
            $arr[$i] = $arr[$temp-1];
            $arr[$temp-1] = $temp;
            $swaps++; 
        }
    }
    return $swaps;
}