使用以下的代码替换smarty的truncate插件即可解决truncate截取utf-8编码的字符串乱码问题。

 

<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */

function smarty_utf8_substr($str,$from,$len){
# utf8 substr
# www.bsdown.com
  return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.
                       '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',
                       '$1',$str);
}

function smarty_modifier_truncate($string, $length = 80, $etc = '...',
                                  $break_words = false, $middle = false)
{
    if ($length == 0)
        return '';

    if (strlen(utf8_decode($string)) > $length) {
        $length -= strlen(utf8_decode($etc));
        if (!$break_words && !$middle) {
            $string = preg_replace('/\s+?(\S+)?$/u', '', smarty_utf8_substr($string, 0, $length+1));
        }
        if(!$middle) {
            return smarty_utf8_substr($string, 0, $length).$etc;
        } else {
            return smarty_utf8_substr($string, 0, $length/2) . $etc . smarty_utf8_substr($string, -$length/2);
        }
    } else {
        return $string;
    }
}

/* vim: set expandtab: */

?>