php对象转json中文变Unicode问题

//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, '\\u') === 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('UCS-2BE', 'UTF-8', $c);//'UCS-2BE'根据系统的不同可能是别的值.
 $name=str_replace($str, $c, $name);
 }
 else
 {
// $name .= $str;
 }
 }
 }
 return $name;
}