Helper.php

<?php
    class Helper
    {
    	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

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