獲取數組php中的密鑰，然後用鍵排序數組？

Question

如果我有一個陣列

Array 
(
[3] => Array 
    (
     [0] => title = title dffgfghfdg 
     [1] => 2-title2 
     [2] => content = content 2 
    ) 

[1] => Array 
    (
     [0] => title = title erer 
     [1] => 1-title1 
     [2] => content = content 1 
    ) 

[0] => Array 
    (
     [0] => title = title sdfdf 
     [1] => 4-title4 
     [2] => content = content 4 
    ) 

[2] => Array 
    (
     [0] => title = titledfdf df 
     [1] => 3-title3 
     [2] => content = content 3 
    ) 
) 

，我將盡[1]是關鍵。因爲我會在[1]中對數組進行排序..？

可能會

Array 
(
[2-title2] => Array 
    (
     [0] => title = title dffgfghfdg 
     [1] => 2-title2 
     [2] => content = content 2 
    ) 

[1-title1] => Array 
    (
     [0] => title = title erer 
     [1] => 1-title1 
     [2] => content = content 1 
    ) 

[4-title4] => Array 
    (
     [0] => title = title sdfdf 
     [1] => 4-title4 
     [2] => content = content 4 
    ) 

[3-title3] => Array 
    (
     [0] => title = titledfdf df 
     [1] => 3-title3 
     [2] => content = content 3 
    ) 
) 

的話，我會用鑰匙排序？ 謝謝

Answer 1

使用foreach（）來轉換數組，然後使用kso​​rt（）。

foreach($a as $k => $v) { 
    $b[$v[1]] = $v; 
} 
ksort($b); 

就是這樣的。

Answer 2

爲此使用usort。 http://php.net/manual/en/function.usort.php

function user_cmp($a, $b) 
{ 
    if($a[1] == $b[1]) return 0; 
    return ($a[1] < $b[1]) ? -1 : 1; 
} 

$arr = array(...); 
usort($arr, 'user_cmp');