ThinkPHP的截取字符串函数无法显示省略号的解决方法

对于ThinkPHP的截取字符串函数无法显示省略号的情况，解决方法如下：
打开Common/extend.php页面，修改msubstr函数如下：

    function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
    {
      if(function_exists("mb_substr")) {
       if($suffix)
      {
         if($str==mb_substr($str, $start, $length, $charset)) 
         {
          return mb_substr($str, $start, $length, $charset); 
         }
         else
         {
          return mb_substr($str, $start, $length, $charset)."..."; 
         } 
     }
        else 
     {
       return mb_substr($str, $start, $length, $charset);
      }
      }
      elseif(function_exists('iconv_substr')) {
       if($suffix)
      {
         if($str==iconv_substr($str,$start,$length,$charset)) 
         {
          return iconv_substr($str,$start,$length,$charset); 
         }
         else
         {
          return iconv_substr($str,$start,$length,$charset)."..."; 
         } 
       }
        else 
     {
       return iconv_substr($str,$start,$length,$charset);
      }
      }
      $re['utf-8']  = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
      $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
      $re['gbk']  = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
      $re['big5']  = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
      preg_match_all($re[$charset], $str, $match);
      $slice = join("",array_slice($match[0], $start, $length));
      if($suffix) return $slice."…";
      return $slice;
    }