仅对多维数组进行PHP排序子组

Question

不知道我错过了某些显而易见的事情，但我无法在其他答案中找到排序多维数组子组的方法，而无需触摸主要顺序。

我有一个数组这样

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 
     ) 
) 

我需要做的就是通过密钥“销售”排序每个“名”组（苹果，橙子和柠檬），剩下的键“名称的顺序“苹果，橙子和柠檬不变，所以结果应该是这样的：

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这一点，任何人都可以给我一个关于这个提示？

谢谢！

Answer 1

@gege试试这个：

<?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

为了便于阅读，我减少了你的数组（它应该仍然适用于你的）。

<?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>"; 

---

编辑

我忘了，该阵列应该有名称分组为好。现在，@BunkerBoy alread张贴的解决方案，但对于completness的缘故，这里是更新排序功能：

$sortBySales = function ($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，唯一的区别是，我减少了比较的计算。