如何排序多维数组

Question

我有以下阵列：

Array 
(
[0] => Array 
    (
     [days] => Wed 
     [count] => 0 
    ) 

[1] => Array 
    (
     [days] => Tue 
     [count] => 0 
    ) 

[2] => Array 
    (
     [days] => Mon 
     [count] => 1 
    ) 

[3] => Array 
    (
     [days] => Sun 
     [count] => 0 
    ) 

我想对它进行排序，所以看起来是这样的：

Array 
(
    [3] => Array 
     (
      [days] => Sun 
      [count] => 0 
     ) 

    [2] => Array 
     (
      [days] => Mon 
      [count] => 1 
     ) 

    [1] => Array 
     (
      [days] => Tue 
      [count] => 0 
     ) 

    [0] => Array 
     (
      [days] => Wed 
      [count] => 0 
     ) 

任何一个可以帮助我做到这一点？

Answer 1

usort($myArray, function($a, $b) { 
    return $a['days'] - $b['days']; // your operation for checking value 
}); 

Answer 2

尝试usort：如果你仍然在PHP 5.2或更早版本，你必须定义一个排序功能第一：

function sortByOrder($a, $b) { 
    return $a['days'] - $b['days']; 
} 

usort($myArray, 'sortByOrder'); 

在PHP 5.3开始，您可以使用匿名函数：

usort($myArray, function($a, $b) { 
    return $a['days'] - $b['days']; 
}); 

最后又用PHP 7，你可以使用 “飞船运营商”：

usort($myArray, function($a, $b) { 
    return $a['days'] <=> $b['days']; 
}); 

Answer 3

function compareOrder($a, $b) 
    { 
     return $a['days'] - $b['days']; 
    } 

    usort($array, 'compareOrder'); 

Answer 4

下面的PHP函数可以帮助：

bool array_multisort (array &$array1 [, mixed $array1_sort_order = SORT_ASC [, mixed $array1_sort_flags = SORT_REGULAR [, mixed $... ]]]) 

Answer 5

可能，这将帮助你

usort($inputArray, function($first, $second) { 
    return $first['days'] - $second['days']; 
});