function arraySort($arr, $keys, $type = 'asc') {
    $keysvalue = $new_array = array();
        foreach ($arr as $k => $v){
            $keysvalue[$k] = $v[$keys];
        }
        $type == 'asc' ? asort($keysvalue) : arsort($keysvalue);
        reset($keysvalue);
        foreach ($keysvalue as $k => $v) {
            $new_array[$k] = $arr[$k];
        }
    return $new_array;
}

二维数组按某个字段排序 代码调用

$folder_list=arraySort($folder_list,"update_time","desc");
//$folder_list是二维数组