Bubble sort implementation in PHP? [duplicate]

Answer 1

    function bubbleSort(array $arr)
    {
        $n = sizeof($arr);
        for ($i = 1; $i < $n; $i++) {
            for ($j = $n - 1; $j >= $i; $j--) {
                if($arr[$j-1] > $arr[$j]) {
                    $tmp = $arr[$j - 1];
                    $arr[$j - 1] = $arr[$j];
                    $arr[$j] = $tmp;
                }
            }
        }

        return $arr;
    }

    // Example:
    $arr = array(255,1,22,3,45,5);
    $result = bubbleSort($arr);
    print_r($result);
//====================================================
//------- improved version----------------------------
//====================================================    
function bubbleSortImproved(array $arr)
{
    $n = sizeof($arr);    
    for ($i = 1; $i < $n; $i++) {
        $flag = false;
        for ($j = $n - 1; $j >= $i; $j--) {
            if($arr[$j-1] > $arr[$j]) {
                $tmp = $arr[$j - 1];
                $arr[$j - 1] = $arr[$j];
                $arr[$j] = $tmp;
                $flag = true;
            }
        }
        if (!$flag) {
            break;
        }
    }

    return $arr;
}

// Example:
$arr = array(255,1,22,3,45,5);
$result = bubbleSortImproved($arr);
print_r($result);