Sort multidimensional array by multiple keys

Question

I\'m trying to sort a multidimensional array by multiple keys, and I have no idea where to start. I looked at uasort, but wasn\'t quite sure how to write a function for what

Answer 1

I have tried to below code and i successfully

array code

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

call array sorting function

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

array sorting funcation

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;
}

if array reverse sorting function

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