thinkphp内置截取字符串函数无法显示省略号解决方法

thinkphp内置截取字符串函数无法显示省略号解决方法

functions.php

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;
}