wordpress如何隐藏评论者的用户名

/* 评论作者和谐，使昵称部分隐藏，例如：ad**n 。*/
function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')
{
 if($code == 'UTF-8')
 {
 $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
 preg_match_all($pa, $string, $t_string);
if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen));
 return join('', array_slice($t_string[0], $start, $sublen));
 }
 else
 {
 $start = $start*2;
 $sublen = $sublen*2;
 $strlen = strlen($string);
 $tmpstr = '';
for($i=0; $i< $strlen; $i++)
 {
 if($i>=$start && $i< ($start+$sublen))
 {
 if(ord(substr($string, $i, 1))>129)
 {
 $tmpstr.= substr($string, $i, 2);
 }
 else
 {
 $tmpstr.= substr($string, $i, 1);
 }
 }
 if(ord(substr($string, $i, 1))>129) $i++;
 }
 //if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";
 return $tmpstr;
 }
}
//替换评论作者
function my_get_comment_author_link() {
$url = get_comment_author_url( $comment_ID );
 $author = cut_str(get_comment_author( $comment_ID ), 2, 0).'***'.cut_str(get_comment_author( $comment_ID ), 1, -1);
 if ( empty( $url ) || 'http://' == $url )
 return $author;
 else
 return "<a target='_blank' href='$url' rel='external nofollow' class='url'>$author</a>";
}
add_filter('get_comment_author_link', 'my_get_comment_author_link');