我在PHP上有一个JSON输出，比如：
[{"Title":"Message","count":"180","Number":"200"},
{"Title":"Message","count":"200","Number":"400"}]
如何获得如下结果？
[{"Title":"Message","count":"380","Number":"600"}]
在php:中
json_encode(array_merge(json_decode($a, true),json_decode($b, true)))
参考：示例