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"}] $d=[{"_id":{"$id":"4fda7d42741d727c