How to garbled characters after setting character sets

How can we garbled $ load_list & nbsp; after setting the character set? $ load_list & nbsp; is a two-dimensional array. The user_name value is taken out of the first two characters and replaced by an asterisk. However, garbled characters still exist after setting the character set, however, the first two characters must be displayed in Chinese. the asterisks are used to represent foreach ($ load_list & nbsp; as & nbsp; $ k = & gt; how can I garbled characters after setting the character set?
$ Load_list is a two-dimensional array, in which the user_name value is taken out of the first two characters, followed by asterisks, but garbled characters still exist after the character set, but the first two characters must be displayed in Chinese, it is represented by an asterisk.
Foreach ($ load_list as $ k =>&$ v ){

$ Temp = & $ v ['User _ name'];
// Determine whether there is any Chinese character
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] = '*';
}
After setting the character set, garbled characters are also shared:
------ Solution --------------------

$ Temp = 'Judge whether there is any Chinese ';
// Determine whether there is any Chinese character
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;

Judgement *****

------ Solution --------------------
Echo base64_encode ($ v ['User _ name']);
Paste the result!

If you don't give a question, how can you know why?
------ Solution --------------------
You have made a mistake on your own. you can't blame the algorithm!
$ T = & $ v ['User _ name'];
It should be $ v ['User _ name'] = $ t;

$ Load_list = array (
Array ('User _ name' => 'xiaodg '),
Array ('User _ name' => 'xforwarded66 '),
Array ('User _ name' => 'etea '),
Array ('User _ name' => 'na0617 '),
Array ('User _ name' => 'kimo '),
Array ('User _ name' => 'shadow '),
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'];

// Determine whether there is any Chinese character
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] => shadow
)

[6] => Array
(
[User_name] => ***
)

[7] => Array
(
[User_name] => qin ***
)

[8] => Array