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

Improving on @Stijn Leenknegt's genius code, here is my 2 cent pragmatic function:

$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);

function make_cmp(array $sortValues)
{
    return function ($a, $b) use (&$sortValues) {
        foreach ($sortValues as $column => $sortDir) {
            $diff = strcmp($a[$column], $b[$column]);
            if ($diff !== 0) {
                if ('asc' === $sortDir) {
                    return $diff;
                }
                return $diff * -1;
            }
        }
        return 0;
    };
}

usort($data, make_cmp(['volume' => "desc", 'edition' => "asc"]));