僅對多維數組進行PHP排序子組

Question

不知道我錯過了某些顯而易見的事情，但我無法在其他答案中找到排序多維數組子組的方法，而無需觸摸主要順序。

我有一個數組這樣

Array 
(
    [1] => Array 
     (
      [name] => Apples 
      [type] => 1 
      [sales] => 10 
     ) 

    [2] => Array 
     (
      [name] => Apples 
      [type] => 2 
      [sales] => 30 
     ) 

    [3] => Array 
     (
      [name] => Apples 
      [type] => 3 
      [sales] => 20 
     ) 

    [4] => Array 
     (
      [name] => Oranges 
      [type] => 1 
      [sales] => 30 
     ) 

    [5] => Array 
     (
      [name] => Oranges 
      [type] => 2 
      [sales] => 10 
     ) 

    [6] => Array 
     (
      [name] => Oranges 
      [type] => 3 
      [sales] => 20 
     ) 

    [7] => Array 
     (
      [name] => Lemons 
      [type] => 1 
      [sales] => 10 
     ) 

    [8] => Array 
     (
      [name] => Lemons 
      [type] => 2 
      [sales] => 30 
     ) 

    [9] => Array 
     (
      [name] => Lemons 
      [type] => 3 
      [sales] => 20 
     ) 
) 

我需要做的就是通過密鑰「銷售」排序每個「名」組（蘋果，橙子和檸檬），剩下的鍵「名稱的順序「蘋果，橙子和檸檬不變，所以結果應該是這樣的：

Array 
(
    [1] => Array 
     (
      [name] => Apples 
      [type] => 1 
      [sales] => 10 
     ) 

    [2] => Array 
     (
      [name] => Apples 
      [type] => 3 
      [sales] => 20 
     ) 

    [3] => Array 
     (
      [name] => Apples 
      [type] => 2 
      [sales] => 30 
     ) 

    [4] => Array 
     (
      [name] => Oranges 
      [type] => 2 
      [sales] => 10 

     ) 

    [5] => Array 
     (
      [name] => Oranges 
      [type] => 3 
      [sales] => 20 
     ) 

    [6] => Array 
     (
      [name] => Oranges 
      [type] => 1 
      [sales] => 30 
     ) 

    [7] => Array 
     (
      [name] => Lemons 
      [type] => 1 
      [sales] => 10 
     ) 

    [8] => Array 
     (
      [name] => Lemons 
      [type] => 3 
      [sales] => 20 
     ) 

    [9] => Array 
     (
      [name] => Lemons 
      [type] => 2 
      [sales] => 30 
     ) 
) 

我找不到任何方式做到這一點，任何人都可以給我一個關於這個提示？

謝謝！

Answer 1

@gege試試這個：

<?php 
    $arr = array(
       array(
         "name" => "Apples", 
         "type" => 1, 
         "sales" => 10 
        ), 
       array(
         "name" => "Apples", 
         "type" => 2, 
         "sales" => 30 
        ), 
       array(
         "name" => "Apples", 
         "type" => 3, 
         "sales" => 20 
        ), 
       array(
         "name" => "Oranges", 
         "type" => 1, 
         "sales" => 30 
        ), 
       array(
         "name" => "Oranges", 
         "type" => 2, 
         "sales" => 10 
        ), 
       array(
         "name" => "Oranges", 
         "type" => 3, 
         "sales" => 20 
        ), 
       array(
         "name" => "Lemons", 
         "type" => 1, 
         "sales" => 10 
        ), 
       array(
         "name" => "Lemons", 
         "type" => 2, 
         "sales" => 30 
        ), 
       array(
         "name" => "Lemons", 
         "type" => 3, 
         "sales" => 20 
        ) 
      ); 
    echo "<pre>"; 
    print_r($arr); // array before 

    function sortArr($a, $b){ 
     if($a["name"] == $b["name"]){ 
      if($a["sales"] == $b["sales"]){ 
       return 0; 
      } 
      return($a["sales"] < $b["sales"] ? -1 : 1); 
     } 
     else{ 
      return($a["name"] < $b["name"] ? -1 : 1); 
     } 
    } 

    usort($arr, "sortArr"); 
    echo "<pre>"; 
    print_r($arr); // array after 

Answer 2

爲了便於閱讀，我減少了你的數組（它應該仍然適用於你的）。

<?php 
// The array structured as assumed according to your example 
$groceries = array(
    array(
     "name" => "Apples", 
     "type" => 1, 
     "sales" => 10 
    ), 
    array(
     "name" => "Apples", 
     "type" => 2, 
     "sales" => 30 
    ), 
    array(
     "name" => "Apples", 
     "type" => 3, 
     "sales" => 20 
    ), 
); 


/** 
* See the PHP docs for more information: http://php.net/manual/en/function.usort.php 
*/ 
$sortBySales = function ($a, $b){ 
    return $a['sales'] - $b['sales']; 
}; 


echo "<h1>Unsorted</h1>"; 
echo "<pre>"; 
    var_dump($groceries); 
echo "</pre>"; 

usort($groceries, $sortBySales); 

echo "<h1>Sorted</h1>"; 
echo "<pre>"; 
    var_dump($groceries); 
echo "</pre>"; 

---

編輯

我忘了，該陣列應該有名稱分組爲好。現在，@BunkerBoy alread張貼的解決方案，但對於completness的緣故，這裏是更新排序功能：

$sortBySales = function ($a, $b){ 
    if($a["name"] == $b["name"]){ 
     return $a['sales'] - $b['sales']; 
    }else{ 
     return($a["name"] < $b["name"] ? -1 : 1); 
    } 
}; 

注意，要@BunkerBoy的功能，唯一的區別是，我減少了比較的計算。