PHP排序根据子阵列

Question

可能重复：
Sorting a multidimensional array in PHP?

$songs = array(
    '1' => array('artist'=>'The Smashing Pumpkins', 'songname'=>'Soma'), 
    '2' => array('artist'=>'The Decemberists', 'songname'=>'The Island'), 
    '3' => array('artist'=>'Fleetwood Mac', 'songname' =>'Second-hand News') 
); 

答案应该来是这样的：

Array(
[0] => Array 
    (
     [artist] => Fleetwood Mac 
     [song] => Second-hand News 
    ) 

[1] => Array 
    (
     [artist] => The Decemberists 
     [song] => The Island 
    ) 

[2] => Array 
    (
     [artist] => The Smashing Pumpkins 
     [song] => Cherub Rock 
    ) 
) 

请帮我在这。

Answer 1

我知道PHP

试试这个：

function subval_sort($a,$subkey) { 
foreach($a as $k=>$v) { 
    $b[$k] = strtolower($v[$subkey]); 
} 
asort($b); 
foreach($b as $key=>$val) { 
    $c[] = $a[$key]; 
} 
return $c; 
} 

调用

$songs = subval_sort($songs,'artist'); 
print_r($songs);