PHP:我有一个关联数组(int => object),想要对它进行排序

<?php
$arr = [
    1 => new stdClass(),
    2 => new stdClass(),
    3 => new stdClass(),
    4 => new stdClass(),
    5 => new stdClass(),
];

ksort($arr);

var_dump($arr);

array(5) {
  [1] =>
  object(stdClass)#1 (1) {
    ["id"]=>
    int(1)
  }
  [2] =>
  object(stdClass)#2 (1) {
    ["id"]=>
    int(2)
  }
  [3] =>
  object(stdClass)#3 (1) {
    ["id"]=>
    int(3)
  }
  [4] =>
  object(stdClass)#4 (1) {
    ["id"]=>
    int(4)
  }
  [5] =>
  object(stdClass)#5 (1) {
    ["id"]=>
    int(5)
  }
}