<?php
class Helper extends CController
{
        public static function truncate_utf8_string($string, $length, $etc = '...')
        {
            $result = '';
            $string = html_entity_decode(trim(strip_tags($string)), ENT_QUOTES, 'UTF-8');
            $strlen = strlen($string);
            for ($i = 0; (($i < $strlen) && ($length > 0)); $i++)
                {
                if ($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0'))
                        {
                    if ($length < 1.0)
                                {
                        break;
                    }
                    $result .= substr($string, $i, $number);
                    $length -= 1.0;
                    $i += $number - 1;
                }
                        else
                        {
                    $result .= substr($string, $i, 1);
                    $length -= 0.5;
                }
            }
            $result = htmlspecialchars($result, ENT_QUOTES, 'UTF-8');
            if ($i < $strlen)
                {
                        $result .= $etc;
            }
            return $result;
        }
}
/*
将Helper.php放进protected\components文件夹下。

 

使用方法：

Helper::truncate_utf8_string($content,20,false);   //不显示省略号
Helper::truncate_utf8_string($content,20);  //显示省略号 
*/