通过预定义的值映射对对象数组进行排序 [英] Sorting Arrays of objects by predefined map of values

问题描述

我有以下数组:

$inputArray = Array(
    [0] => stdClass Object (
        [id] => 8
    )

    [1] => stdClass Object (
        [id] => 7
    )

    [2] => stdClass Object (
        [id] => 5
    )
)

$sortingArray = [5,8,1]

我正在寻找一种通过ID值映射"对输入数组进行排序的有效方法..预期的输出应为$ inputArray重新排序，以便第3个项目为第一，第一个项目为第二，依此类推. >

谢谢！

解决方案

在这里我使用了一些东西，主要是我将排序数组用作array_replace()的目标，而我使用了array_column()索引对象(需要PHP 7.0+才能使用对象)...

$input = array_column($inputArray, null, "id");   
$sort = array_fill_keys($sortingArray, null);
$output = array_filter(array_replace($sort, $input));

array_filter()将删除不在输入数组中但在排序数组中的所有元素.使用array_fill_keys()代替array_flip()，以便我可以设置一个空值，以使过滤器正常工作.

I have the following Arrays:

$inputArray = Array(
    [0] => stdClass Object (
        [id] => 8
    )

    [1] => stdClass Object (
        [id] => 7
    )

    [2] => stdClass Object (
        [id] => 5
    )
)

$sortingArray = [5,8,1]

I'm looking an efficient way to sort the input array by the id "map of values".. expected output should be $inputArray reordered so that 3rd item would be first, first item would be 2nd etc.

thanks!

解决方案

I've used a few things here, the main thing is that I use the sorting array as a target for an array_replace() and I use array_column() to index the objects by (this needs PHP 7.0+ to work with objects)...

$input = array_column($inputArray, null, "id");   
$sort = array_fill_keys($sortingArray, null);
$output = array_filter(array_replace($sort, $input));

The array_filter() will remove any elements which aren't in the input array but in the sorting array. The array_fill_keys() is used instead of array_flip() so that I can set a null value, which allows the filter to work.

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