codewars/php/kyu7/bubblesort_once/k.php

<?php

function bubblesort_once($a) {
  $clone = array_replace([], $a);
  if (count($clone) < 2) {
    return $clone;
  }

  for ($i = 0; $i < count($clone) - 1; $i++) {
    if ($clone[$i] > $clone[$i + 1]) {
      $tmp = $clone[$i+1];
      $clone[$i+1] = $clone[$i];
      $clone[$i] = $tmp;
    }
  }
  return $clone;
}