include/helpers/charset.helper.php

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<?php  if(!defined('DEDEINC')) exit('dedecms');
/**
 * DedeCMS中用到的字符编码转换的小助手函数
 *
 * @version        $Id: charset.helper.php 1 2010-07-05 11:43:09Z tianya $
 * @package        DedeCMS.Helpers
 * @copyright      Copyright (c) 2007 - 2010, DesDev, Inc.
 * @license        http://help.dedecms.com/usersguide/license.html
 * @link           http://www.dedecms.com
 */


$UC2GBTABLE = $CODETABLE = $BIG5_DATA = $GB_DATA = '';
$GbkUniDic = null;

/**
 *  UTF-8 转GB编码
 *
 * @access    public
 * @param     string  $utfstr  需要转换的字符串
 * @return    string
 */
if ( ! function_exists('utf82gb'))
{
    function utf82gb($utfstr)
    {
        if(function_exists('iconv'))
        {
            return iconv('utf-8','gbk//ignore',$utfstr);
        }
        global $UC2GBTABLE;
        $okstr = "";
        if(trim($utfstr)=="")
        {
            return $utfstr;
        }
        if(empty($UC2GBTABLE))
        {
            $filename = DEDEINC."/data/gb2312-utf8.dat";
            $fp = fopen($filename,"r");
            while($l = fgets($fp,15))
            {
                $UC2GBTABLE[hexdec(substr($l, 7, 6))] = hexdec(substr($l, 0, 6));
            }
            fclose($fp);
        }
        $okstr = "";
        $ulen = strlen($utfstr);
        for($i=0;$i<$ulen;$i++)
        {
            $c = $utfstr[$i];
            $cb = decbin(ord($utfstr[$i]));
            if(strlen($cb)==8)
            {
                $csize = strpos(decbin(ord($cb)),"0");
                for($j=0;$j < $csize;$j++)
                {
                    $i++; $c .= $utfstr[$i];
                }
                $c = utf82u($c);