Sort Multiarray

gistfile1.php

<?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')
	);

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;
}

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

?>

//Resultado
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
        )
 
)