PHP导出CSV UTF-8转GBK不乱码的解决办法

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/**
* http://yige.org/php/
* @ string 需要转换的文字
* @ encoding 目标编码
**/    
function convert_encoding($string, $encoding = 'gbk'){
        $is_utf8 =  preg_match('%^(?:[\x09\x0A\x0D\x20-\x7E]| [\xC2-\xDF][\x80-\xBF]|  \xE0[\xA0-\xBF][\x80-\xBF] | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}    |  \xED[\x80-\x9F][\x80-\xBF] |  \xF0[\x90-\xBF][\x80-\xBF]{2}  | [\xF1-\xF3][\x80-\xBF]{3}  |  \xF4[\x80-\x8F][\x80-\xBF]{2} )*$%xs', $string);
        if($is_utf8 && $encoding == 'utf8'){
                return $string;
        }elseif($is_utf8){
                return mb_convert_encoding($string, $encoding, "UTF-8");
        }else{
                return mb_convert_encoding($string, $encoding, 'gbk,gb2312,big5');
        }
}

应用办法

/**
 * 输出一个csv头，用于下载
 * @param string $filename, 输出的下载文件名
 * @return null
 */
function csv_header_4_downloading($filename, $encode = 'UTF-8')
{
        header('Content-Encoding: ' . $encode);
        header('Content-type: text/csv; charset=' . $encode);
        header("Content-Disposition: attachment; filename={$filename}.csv");
        if (strtolower($encode) == 'utf-8') echo "\xEF\xBB\xBF"; // UTF-8 BOM
}
/**
    * 导出数据为excel表格
    *@param $data    一个二维数组,结构如同从数据库查出来的数组
    *@param $title   excel的第一行标题,一个数组,如果为空则没有标题
    *@param $filename 下载的文件名
    *@examlpe 
    $stu = M ('User');
    $arr = $stu -> select();
    exportexcel($arr,array('id','账户','密码','昵称'),'文件名!');
*/
function export2excel($data=array(), $title=array(), $filename='report'){
        ob_clean();
    csv_header_4_downloading($filename, 'gbk');
    //导出xls 开始
    if (!empty($title)){
                
        foreach ($title as $k => &$v) {
                        $v = convert_encoding($v, 'gbk');
        }
        $title= implode("\",\"", $title);
        echo "\"$title\"\r\n";
    }

    if (!empty($data)){
        foreach($data as $key => &$val){
            foreach ($val as $ck => &$cv) {
                                $cv = str_replace(',', '，', $cv);
                                $cv = str_replace("\"", "\\\"", $cv);
                                $cv = str_replace("\r", "", $cv);
                                $cv = str_replace("\n", "", $cv);
                                $cv = strip_tags($cv);
                                $cv = convert_encoding($cv, 'gbk');
            }
            $val = implode("\",\"", $val);
                        echo "\"$val\"\r\n";
        }
    }
        exit();
}