php数组排序

function arr_sort ($array, $key, $order = "asc")
{//asc是升序 desc是降序
    $arr_nums = $arr = array();
    foreach ($array as $k => $v) {
        $arr_nums[$k] = $v[$key];
    }
    if ($order == 'asc') {
        asort($arr_nums);
    } else {
        arsort($arr_nums);
    }
    foreach ($arr_nums as $k => $v) {
        $arr[$k] = $array[$k];
    }
    return $arr;
}