php怎么将json中的unicode编码转为汉字

php如何将json中的unicode编码转为汉字？
有两个json数据
$d=[{"_id":{"$id":"4fda7d42741d727c14000000"},"name":"\u519c\u592b\u5c71\u6cc9","bc":"123456","pic":"d: pic\water.jpg","aid":"232fd4df3"}]
$c=[{"_id":{"$id":"4fdaa7f3741d725816000000"},"bc":"012345678","name":"\u7ef4\u8fbe\u7eb8\u5dfe","cls":{"id":"125","name":"\u65e5\u7528\u54c1"},"std":{"name":"\u5f20\u6570","val":"10"}}]

如何将其中unicode字符转为汉字,使得

$d=[{"_id":{"$id":"4fda7d42741d727c14000000"},"name":"农夫山泉","bc":"123456","pic":"d: pic\water.jpg","aid":"232fd4df3"}]
$c=[{"_id":{"$id":"4fdaa7f3741d725816000000"},"bc":"012345678","name":"维达纸巾","cls":{"id":"125","name":"日用品"},"std":{"name":"张数","val":"10"}}]

哪位知道的话帮忙解答一下，先谢谢了~~

------解决方案--------------------
怎么说不行呢

我试了可以，

$str = '$d=[{"_id":{"$id":"4fda7d42741d727c14000000"},"name":"\u519c\u592b\u5c71\u6cc9","bc":"123456","pic":"d: pic\water.jpg","aid":"232fd4df3"}]
$c=[{"_id":{"$id":"4fdaa7f3741d725816000000"},"bc":"012345678","name":"\u7ef4\u8fbe\u7eb8\u5dfe","cls":{"id":"125","name":"\u65e5\u7528\u54c1"},"std":{"name":"\u5f20\u6570","val":"10"}}]';

$str=preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $str);
echo $str;



乱码的话记得换下浏览器编码。