unicode 格式 转汉字

function decodeUnicode($str)
{
return preg_replace_callback('/\\\\u([0-9a-f]{4})/i',
create_function(
'$matches',
'return mb_convert_encoding(pack("H*", $matches[1]), "UTF-8", "UCS-2BE");'
),
$str);
}

$arr = array('name1':"中文",'name2':'abc12');
$jsonstr = decodeUnicode(json_encode($arr));