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HomeBackend DevelopmentPHP TutorialPHP插入排序实现代码_php实例

算法描述:

⒈ 从第一个元素开始,该元素可以认为已经被排序
⒉ 取出下一个元素,在已经排序的元素序列中从后向前扫描
⒊ 如果该元素(已排序)大于新元素,将该元素移到下一位置
⒋ 重复步骤3,直到找到已排序的元素小于或者等于新元素的位置
⒌ 将新元素插入到下一位置中
⒍ 重复步骤2

复制代码 代码如下:

    $arr =array(123,0,5,-1,4,15);

    function insertSort(&$arr){

        //先默认第一个下标为0的数是排好的数
        for($i=1;$i            //确定插入比较的数
            $insertVal=$arr[$i];
            //确定与前面比较的数比较
            $insertIndex=$i-1;

            //表示没有找到位置
            while($insertIndex>=0 && $insertVal

                //把数后移
                $arr[$insertIndex+1]=$arr[$insertIndex];
                $insertIndex--;
            }

        //插入(给$insertval找到位置了)
        $arr[$insertIndex+1] = $insertVal;
        }
    }

    insertSort($arr);
    print_r($arr);
?>

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