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(); 
   }   
  }
 }