将具有特定值的数组元素移动到数组顶部

Question

我有一个类似于这个的数组:

Array
(
  [0] => stdClass Object
    (
      [Leasing] => 12939.74
      [Name] => Jeremy
      [Rental] => 0
      [Sales] => 56603.13
      [Total] => 69542.87
    )
  [1] => stdClass Object
    (
      [Leasing] => 0
      [Name] => Shaun
      [Rental] => 0
      [Sales] => 58590
      [Total] => 58590
    )
  [2] => stdClass Object
    (
      [Leasing] => 0
      [Name] => Lindsay
      [Rental] => 0
      [Sales] => 22951.97
      [Total] => 22951.97
    )
  [3] => stdClass Object
    (
      [Leasing] => 0
      [Name] => Sally
      [Rental] => 1200
      [Sales] => 21624.9
      [Total] => 22824.9
    )
  [4] => stdClass Object
    (
      [Leasing] => 0
      [Name] => House
      [Rental] => 0
      [Sales] => 16235.81
      [Total] => 16235.81
    )
  [5] => stdClass Object
    (
      [Leasing] => 5298.85
      [Name] => Bill
      [Rental] => 1200
      [Sales] => 0
      [Total] => 6498.85
    )
)

目前,数组按总计排序使用:

usort($data, function ($a, $b) {
    return $b->Total - $a->Total;
});

现在,我需要能够始终将这个人[Name] => House放在阵列的顶部.我的想法是我可以将它排序Total(因为我仍然需要它),然后使用带有House值的元素并将其放在数组的开头.我可以使用特定的KEY并将其置于顶部,但KEY可能会根据总数最高的人而改变.我怎样才能总是把名字命名的人放在House数组顶部？

Answer 1

这应该工作:

usort($data, function ($a, $b) {
    if ($a->Name != "House" && $b->Name == "House") {
        return 1;
    } elseif ($a->Name == "House" && $b->Name != "House") {
        return -1;
    } else {
        return $b->Total - $a->Total;
    }
});

来自PHP:usort - 手册:

如果第一个参数被认为分别小于,等于或大于第二个参数,则比较函数必须返回小于,等于或大于零的整数.

在这种情况下,返回1告诉排序函数,House比任何其他值时,并且-1其House比任何其他值较小.