php二维数组排序后获取最大值

function array_sort($arr,$keys,$type='asc'){ //2维数组排序
$keysvalue = $new_array = array();
foreach ($arr as $k=>$v){
$keysvalue[$k] = $v[$keys];
}
if($type == 'asc'){
asort($keysvalue);
}else{
arsort($keysvalue);
}
reset($keysvalue);
foreach ($keysvalue as $k=>$v){
$new_array[$k] = $arr[$k];
}
return $new_array;
}

//$re 为数据来源，二维数组

$re = $this->array_sort($re,'LV','desc');//排序
foreach($re as $key=>$val){
foreach ($val as $key2=>$val2){
if($key2=="uid"){
$count[] = $val2;//获取创建角色总数
$lv[$val2][]=$re[$key]['LV'];//获取所有角色等级
}

}
}
$count = array_count_values($count);
foreach($count as $key=>$val){
M()->query("update mj_ad_count set create_juese = create_juese+".$val." where suid =".$key);
echo M()->getLastSql();
}
foreach($lv as $key =>$val){//等级排查找出最大值后写入统计
foreach ($val as $key2=> $val2){
if($key2==0){
//$ls[$key][] = $val2;
M()->query("update mj_ad_count set juese_leave = ".$val2." where suid =".$key);
echo M()->getLastSql();
}
}
}