根据二维键的值排序

use Arr;
Route::get('test', function (){
  $arr = [];
  $arr[0]['score']['grade'] = 3;
  $arr[0]['times'] = 2;
  $arr[5]['score']['grade'] = 2;
  $arr[5]['times'] = 3;
  $a = Arr::sort($arr, function ($value) {return $value['times'];});dd($a);
});

打印结果

array:2 [▼
  0 => array:2 [▼
    "score" => array:1 [▶]"times" => 2]5 => array:2 [▼
    "score" => array:1 [▶]"times" => 3]
]

根据三维键的值排序

use Arr;
Route::get('test', function (){
  $arr = [];
  $arr[0]['score']['grade'] = 3;
  $arr[0]['times'] = 2;
  $arr[5]['score']['grade'] = 2;
  $arr[5]['times'] = 3;
  $a = Arr::sort($arr, function ($value) {return $value['score']['grade'];});dd($a);
});

打印结果

array:2 [▼
  5 => array:2 [▼
    "score" => array:1 [▼
      "grade" => 2]"times" => 3]0 => array:2 [▼
    "score" => array:1 [▼
      "grade" => 3]"times" => 2]
]

全是数字键的多维数组

use Arr;
Route::get('test', function (){
    $arr2[0][0][0] = 2;
    $arr2[0][0][1] = 1;
    $arr2[1][0][0] = 1;
    $arr2[1][0][1] = 2;

    $a = Arr::sort($arr2);});dd($a);
});

打印结果

array:2 [▼
  1 => array:1 [▼
    0 => array:2 [▼
      0 => 11 => 2]]0 => array:1 [▼
    0 => array:2 [▼
      0 => 21 => 1]]
]

以下操作都是错误操作

尝试按一维键的值排序

use Arr;
Route::get('test', function (){
    $arr1['a']['a1']['a11'] = 3;
    $arr1['a']['a1']['a12'] = 2;
    $arr1['a']['a2']['a21'] = 2;
    $arr1['a']['a2']['a22'] = 3;
    $a = Arr::sort($arr1, function ($value) {return $value['a'];});dd($a);
});

打印结果

这个会报错，找不到索引

尝试根据键的值是数组的二维键的值排序

use Arr;
Route::get('test', function (){
  $arr = [];
  $arr[0]['score']['grade'] = 3;
  $arr[0]['times'] = 2;
  $arr[5]['score']['grade'] = 2;
  $arr[5]['times'] = 3;
  $a = Arr::sort($arr, function ($value) {return $value['score'];});dd($a);
});

打印结果

array:2 [▼
  5 => array:2 [▼
    "score" => array:1 [▼
      "grade" => 2]"times" => 3]0 => array:2 [▼
    "score" => array:1 [▼
      "grade" => 3]"times" => 2]
]

貌似并未排序，应该是无效操作，原因不明

结论

• 不管是几维数组，也不管数组键是数字还是字符串，这个方法不会改变值对应的键；
• 传递闭包的话，是从第二个维度以及之后找索引的
• 若根据传递的索引找不到值，那么结果是无效的（传递的索引后面的键如果都是数字的话，是可以找到值的，默认是取第一值）
• 三维数组，应该按这种方式传数组，value[string_key1][string_key2]
• 全是数字键的多维数组，默认是取第一个值来做比较，例如

$arr2[0][0][0] = 2;
$arr2[0][0][1] = 1;
$arr2[1][0][0] = 1;
$arr2[1][0][1] = 2;

• 取的是$arr2[0][0][0] = 2; 和 $arr2[1][0][0] = 1;做比较的。