Php 如何根据键上的特定标准对对象数组进行排序

假设我们有这个对象数组:

$myWondersArray =

array (
  0 => 
  (object) array(
     'currentUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 1/3)',
     'currentUnitPart' => 'wonderskills/starter_book_2/unit_3_helping_mom/part_1/',
  ),
  1 => 
  (object) array(
     'currentUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 2/3)',
     'currentUnitPart' => 'wonderskills/starter_book_2/unit_3_helping_mom/part_2/',
  ),
  2 => 
  (object) array(
     'currentUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 3/3)',
     'currentUnitPart' => 'wonderskills/starter_book_2/unit_3_helping_mom/part_3/',
  ),
  3 => 
  (object) array(
     'previousUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 2 - Sid\'s New Neighbors (Part 1/3)',
     'previousUnitPart' => 'wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_1/',
  ),
  4 => 
  (object) array(
     'previousUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 2 - Sid\'s New Neighbors (Part 2/3)',
     'previousUnitPart' => 'wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_2/',
  ),
  5 => 
  (object) array(
     'previousUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 2 - Sid\'s New Neighbors (Part 3/3)',
     'previousUnitPart' => 'wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_3/',
  ),
  6 => 
  (object) array(
     'nextUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 1/3)',
     'nextUnitPart' => 'wonderskills/starter_book_2/unit_4_food_from_the_garden/part_1/',
  ),
  7 => 
  (object) array(
     'nextUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 2/3)',
     'nextUnitPart' => 'wonderskills/starter_book_2/unit_4_food_from_the_garden/part_2/',
  ),
  8 => 
  (object) array(
     'nextUnitDisplay' => 'WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 3/3)',
     'nextUnitPart' => 'wonderskills/starter_book_2/unit_4_food_from_the_garden/part_3/',
  ),
)

数组的期望顺序是关键字以"previous"开头的对象位于顶部.然后是键以"当前"开头的对象，最后是键以"下一个"开头的对象.

对象本身应该保持不变，但应该保持部分(在值中)的正确顺序.

期望的结果是这样的:

Array
(
    [0] => stdClass Object
        (
            [previousUnitDisplay] => WonderSkills: Starter Book 2, Unit 2 - Sid's New Neighbors (Part 1/3)
            [previousUnitPart] => wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_1/
        )

    [1] => stdClass Object
        (
            [previousUnitDisplay] => WonderSkills: Starter Book 2, Unit 2 - Sid's New Neighbors (Part 2/3)
            [previousUnitPart] => wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_2/
        )

    [2] => stdClass Object
        (
            [previousUnitDisplay] => WonderSkills: Starter Book 2, Unit 2 - Sid's New Neighbors (Part 3/3)
            [previousUnitPart] => wonderskills/starter_book_2/unit_2_sids_new_neighbors/part_3/
        )

    [3] => stdClass Object
        (
            [currentUnitDisplay] => WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 1/3)
            [currentUnitPart] => wonderskills/starter_book_2/unit_3_helping_mom/part_1/

        )

    [4] => stdClass Object
        (
            [currentUnitDisplay] => WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 2/3)
            [currentUnitPart] => wonderskills/starter_book_2/unit_3_helping_mom/part_2/
        )

    [5] => stdClass Object
        (
            [currentUnitDisplay] => WonderSkills: Starter Book 2, Unit 3 - Helping Mom (Part 3/3)
            [currentUnitPart] => wonderskills/starter_book_2/unit_3_helping_mom/part_3/
        )

    [6] => stdClass Object
        (
            [nextUnitDisplay] => WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 1/3)
            [nextUnitPart] => wonderskills/starter_book_2/unit_4_food_from_the_garden/part_1/
        )

    [7] => stdClass Object
        (
            [nextUnitDisplay] => WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 2/3)
            [nextUnitPart] => wonderskills/starter_book_2/unit_4_food_from_the_garden/part_2/
        )

    [8] => stdClass Object
        (
            [nextUnitDisplay] => WonderSkills: Starter Book 2, Unit 4 - Food from the Garden (Part 3/3)
            [nextUnitPart] => wonderskills/starter_book_2/unit_4_food_from_the_garden/part_3/
        )

)

我try 过通常的php排序功能，但我需要的不仅仅是字母顺序.我能够生成一个包含上述所有项的数组，但最终在此过程中丢失了对象.我真的很想保持这些物品完好无损.

我try 通过首先创建3个数组(一个用于上一个、当前和下一个)来创建一个新数组，如下所示:

foreach($myWondersArray as $item => $value) {
    if($value->previousUnitDisplay){
        //echo "got a previous" ;
        array_push($previousArray, $value->previousUnitDisplay, $value->previousUnitPart) ;
    }
} 

然后我将它们合并，就像这样:

$completeWondersArray = array_merge($previousArray, $currentArray, $nextArray);

但现在我失go 了我的对象，它只是一个简单的array.

非常感谢任何帮助或指示.