PHP5.2 汉字json_encode

//对汉字编码
private function url_encode($str) {
if(is_array($str)) {
foreach($str as $key=>$value) {
$str[urlencode($key)] = url_encode($value);
}
} else {
$str = urlencode($str);
}

return $str;
}
//错误信息记录
private function func_err($msg,$data,$cate)
{
//咨询
$data['author'] = $this->url_encode($data['author']);
//病种
$data['disease'] = $this->url_encode($data['disease']);
//$this->url_encode('sdfsd');
//将数据json化
$data = json_encode($data);
//当前添加时间
$time = date("Y-m-d H:i:s",time());
//编辑sql语句
$sql = "insert into patient_arrive_err(msg,data,cate,create_time) values ('{$msg}','{$data}','{$cate}','{$time}')";
//保存信息
$this->db->query($sql);
}

function encode_json($str) {
    return urldecode(json_encode(url_encode($str)));
}

/**
 *
 */
function url_encode($str) {
    if(is_array($str)) {
        foreach($str as $key=>$value) {
            $str[urlencode($key)] = url_encode($value);
        }
    } else {
        $str = urlencode($str);
    }

    return $str;