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

function smarty_modifier_truncate($string, $length = 80, $etc = '',$break_words = false, $middle = false)
{
	if ($length == 0) return '';
	
	if (strlen($string) > $length) {
		$length -= strlen($etc);
		if (!$break_words && !$middle) {
		$string = preg_replace('/s+?(S+)?$/', '', CnSubstr($string, 0, $length+1));
		}
		if(!$middle) {
			return CnSubstr($string, 0, $length).$etc;
		} else {
			return CnSubstr($string, 0, $length/2) . $etc . CnSubstr($string, -$length/2);
		}
	} else {
		return $string;
	}
}

function CnSubstr($str,$start,$len)
{
	for($i=0;$i<$start+$len;$i++)
	{
		$tmpstr=(ord($str[$i])>=161 && ord($str[$i])<=254&& ord($str[$i+1])>=161 && ord($str[$i+1])<=254)?$str[$i].$str[++$i]:$tmpstr=$str[$i];
		if ($i>=$start&&$i<($start+$len))$tmp .=$tmpstr;
	}
	return $tmp;
}
?>