设置字符集后如何还乱码

设置字符集后怎么还乱码
$load_list 是一个二维数组，将其中的user_name值取出前两个字符，后面用星号代替，但是设置字符集后还是有乱码，但是中文是要显示前两个字符，后面用星号表示
foreach($load_list as $k=>&$v){

$temp=&$v['user_name'];
//判断是否有中文
if (!preg_match('/^([\x81-\xfe][\x40-\xfe]){0,2}$/',$temp)){
$len=mb_strlen($temp,'utf-8');
}else{
$len=strlen($temp);
}
for($k=0;$k<$len;$k++){
if($k>1){
$temp[$k]='*';
}
设置字符集后还乱码

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------解决方案--------------------

$temp = '判断是否有中文';

//判断是否有中文

if(preg_match('/[\x81-\xfe][\x40-\xfe]/',$temp)){

  mb_internal_encoding("gbk");

}else {

  mb_internal_encoding("utf-8");

}

$len = mb_strlen($temp);

$t = '';

for($k=0; $k<$len; $k++){

  if($k>1) {

    $t .= '*';

  }else {

   $t .= mb_substr($temp, $k, 1);

  }

}

echo $t;

判断*****

------解决方案--------------------
echo base64_encode($v['user_name']);
贴出结果！

你不给出问题现场，如何知道是什么原因？
------解决方案--------------------
你自己写错了，不能怪算法！
$t=&$v['user_name'];
应该是 $v['user_name'] = $t;

$load_list =array(

  array('user_name' => 'xiaodg'),

  array('user_name' => 'x42466'),

  array('user_name' => 'etea'),

  array('user_name' => 'na0617'),

  array('user_name' => 'kimo'),

  array('user_name' => '留影'),

  array('user_name' => 'vian22'),

  array('user_name' => 'qingyu'),

  array('user_name' => 'jiangliman'),

  array('user_name' => 'xiaobu'),

  array('user_name' => 'xiaobu'),

  array('user_name' => 'hfa818'),

);



foreach($load_list as $k=>&$v){

  $temp=$v['user_name'];



  //判断是否有中文

  if(preg_match('/[\x81-\xfe][\x40-\xfe]/',$temp)){

    mb_internal_encoding("gbk");

  }else {

    mb_internal_encoding("utf-8");

  }

  $len = mb_strlen($temp);

  $t = '';

  for($k=0; $k<$len; $k++){

    if($k>2) {

      $t .= '*';

    }else {

      $t .= mb_substr($temp, $k, 1);

    }

  }

  $v['user_name'] = $t;

}

print_r($load_list);

Array

(

    [0] => Array

        (

            [user_name] => xia***

        )



    [1] => Array

        (

            [user_name] => x42***

        )



    [2] => Array

        (

            [user_name] => ete*

        )



    [3] => Array

        (

            [user_name] => na0***

        )



    [4] => Array

        (

            [user_name] => kim*

        )



    [5] => Array

        (

            [user_name] => 留影

        )



    [6] => Array

        (

            [user_name] => via***

        )



    [7] => Array

        (

            [user_name] => qin***

        )



    [8] => Array