//准备 二维数组 //按一个字段排序
foreach($rank as $key=>$val){
$dos[$key] = $val['timelength'];
}
array_multisort($dos,SORT_ASC,$rank);
var_dump($rank);
//按两个字段先后排序
foreach($rank as $key=>$val){
$dos[$key] = $val['timelength'];
$ds[$key] = $val['join_time'];
}
array_multisort($dos,SORT_ASC,$ds,SORT_ASC,$rank);
var_dump($rank);