通过中间键启动重新排序PHP数组（圆形分类） [英] Re-order PHP array by middle key as start (Circular Sorting)

问题描述

很基本的问题，但是我也遇到了一些麻烦上PHP.NET寻找答案。

very basic question however I have had some trouble finding the answers on PHP.NET.

我有以下数组：

Array (

[1] => Array
    (
        [1] => 4
        [2] => 1
        [3] => 5
        [4] => 3
    )

[2] => Array
    (
        [5] => 2
        [6] => 8
        [7] => 7
        [8] => 6
    )

[3] => Array
    (
        [9] => 10
        [10] => 9
        [11] => 12
        [12] => 11
    )

[4] => Array
    (
        [13] => 15
        [14] => 16
        [15] => 14
        [16] => 13
    )

)

欲被重新排序阵列，使得在第一个系列阵列的键号3成为第一，那么剩下的是从那里重新排序，以最终得到的结果是：

I want the array to be re-ordered so that the key number 3 in the first series of the array becomes the first, then the rest to be re-ordered from there to eventually get the result of:

Array (

[3] => Array
    (
        [9] => 10
        [10] => 9
        [11] => 12
        [12] => 11
    )

[4] => Array
    (
        [13] => 15
        [14] => 16
        [15] => 14
        [16] => 13
    )

[1] => Array
    (
        [1] => 4
        [2] => 1
        [3] => 5
        [4] => 3
    )

[2] => Array
    (
        [5] => 2
        [6] => 8
        [7] => 7
        [8] => 6
    )

)

我要寻找一种方式来做到这一点，所以我可以定义数组，然后第一级关键，我需要进行排序，然后它会以这种方式返回数组。

I am looking for a way to do this so I can define the array, then the first level key I need to sort by, and then it will return the array in this way.

标准的PHP按键似乎并没有提供这样的事情，所以这将是很好的能够有一个单独的函数，比如$ newArray = reorder_array（$数组$关键）;

The standard PHP keys didn't seem to offer something like this, so it would be good to be able to have a separate function such as $newArray = reorder_array($array, $key);

我不要求第二级的任何排序，只有最初的4个主要/第一级阵列部分

I don't require any sorting of the second level, only the initial 4 main / first level array sections.

您帮助是极大的pciated因为我一直坐在这个一段时间没有一个明确的和简单的解决方案AP $ P $。

You help is greatly appreciated as I have been sitting on this one for awhile without a clear and simple solution.

推荐答案

您重新排序可以用一个的foreach 循环简单地实现，如：

You re-ordering can be simply implemented with one foreach loop, like:

function reorderArray($array, $key)
{
    $found = false;
    foreach($array as $k=>$v)
    {
        $found = $found || $k===$key;
        if(!$found)
        {
            unset($array[$k]);
            $array[$k] = $v;
        }
        //else break can be added for performance issues
    }
    return $array;
}

与使用

$array=[1=>'foo', 4=>'bar', 9=>'baz', 'test'=>51];
var_dump(reorderArray($array, 9));
var_dump(reorderArray($array, 'test'));
var_dump(reorderArray($array, 'no_such_key'));//original array in result

这个演示。如果按键是连续的数字，但是，这可以很容易地与 实施array_slice（） 通话。

-check this demo. If keys are consecutive numerics, however, this can be easily implemented with array_slice() calls.

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