php按两个标准排序对象？

Question

试图根据(1)深度和(2)权重对这个对象数组进行排序,并且我不确定如何修改我用来包含这个其他级别的函数...

我正在使用这个功能:

function cmp( $a, $b ) {
if(  $a->weight ==  $b->weight ){ return 0 ; }
  return ($a->weight < $b->weight) ? -1 : 1;
}

然后这样做:

$menu = get_tree(4, $tid, -1, 2);
usort($menu, 'cmp');

这将根据重量准确地对数组进行排序,但我需要添加另一级别的排序.因此,首先根据深度对数组进行排序,然后按重量进行排序.

所以,如果原始数组看起来像这样:

    Array
(
    [0] => stdClass Object
        (
            [tid] => 24
            [name] => Sample
            [weight] => 3
            [depth] => 0
        )

    [1] => stdClass Object
        (
            [tid] => 66
            [name] => Sample Subcategory
            [weight] => 0
            [depth] => 1
        )

    [2] => stdClass Object
        (
            [tid] => 67
            [name] => Another Example
            [weight] => 1
            [depth] => 0
        )

    [3] => stdClass Object
        (
            [tid] => 68
            [name] => Subcategory for Another Example
            [weight] => 1
            [depth] => 1
        )

    [4] => stdClass Object
        (
            [tid] => 22
            [name] => A third example master category
            [weight] => 0
            [depth] => 0
        )

我可以先按深度排序,然后按重量排序,以便结果如下所示:

Array
(
    [0] => stdClass Object
        (
            [tid] => 22
            [name] => A third example master category
            [weight] => 0
            [depth] => 0
        )

    [1] => stdClass Object
        (
            [tid] => 67
            [name] => Another Example
            [weight] => 1
            [depth] => 0
        )

    [2] => stdClass Object
        (
            [tid] => 24
            [name] => Sample
            [weight] => 3
            [depth] => 0
        )

    [3] => stdClass Object
        (
            [tid] => 66
            [name] => Sample Subcategory
            [weight] => 0
            [depth] => 1
        )

    [4] => stdClass Object
        (
            [tid] => 68
            [name] => Subcategory for Another Example
            [weight] => 0
            [depth] => 1
        )

Answer 1

function cmp( $a, $b )
{
  if ($a->depth == $b->depth)
  {
    if($a->weight == $b->weight) return 0 ;
    return ($a->weight < $b->weight) ? -1 : 1;
  }
  else
    return ($a->depth < $b->depth) ? -1 : 1;
}