PHP オブジェクトから JSON へ、中国語から Unicode への問題

//json_encode()函数在php5.4.0之后可以通过传入参数JSON_UNESCAPED_UNICODE保持中文原样, 不进行Unicode 转码.
echo unicode_decode(json_encode($response));
function unicode_decode($name)
{
    // 转换编码，将Unicode编码转换成可以浏览的utf-8编码
    $pattern = '/([\w]+)|(\\\u([\w]{4}))/i';
    preg_match_all($pattern, $name, $matches);
    if (!empty($matches))
    {
        for ($j = 0; $j < count($matches[0]); $j++)
        {
            $str = $matches[0][$j];
            if (strpos($str, &#39;\\u&#39;) === 0)
            {
                $code = base_convert(substr($str, 2, 2), 16, 10);
                $code2 = base_convert(substr($str, 4), 16, 10);
                $c = chr($code).chr($code2);
                $c = iconv(&#39;UCS-2BE&#39;, &#39;UTF-8&#39;, $c);//&#39;UCS-2BE&#39;根据系统的不同可能是别的值.
                $name=str_replace($str, $c, $name);
            }
            else
            {
//                $name .= $str;
            }
        }
    }
    return $name;
}