php輸出json,需要嵌套數組和物件問題

Question

            $tmp = [];
            $tmp['id'] = 'aaa';
            $tmp['name'] = 'bbb';
            $tmp['vvvv'] = [
                'www'=>1,
                'ffff'=>2
            ];
            
            echo (json_encode($tmp));

輸出是

{
"id": "aaa",
"name": "bbb",
"vvvv": {
    "www": 1,
    "ffff": 2
}
}

我想問如何將輸出改為

{
"id": "aaa",
"name": "bbb",
"vvvv": [
    {"www": 1},
    {"ffff": 2}
]
}

我測試過這樣是可以的,就是不太好用:

    $tmp['vvvv'] = [
                0=>(object)['www'=>1],
                1=>(object)['fff'=>2]
            ];

Answer 1

將$tmp['vvvv']裡的元素換成數組就行了，不需要轉換為object，如下

            $tmp = [];
            $tmp['id'] = 'aaa';
            $tmp['name'] = 'bbb';
            $tmp['vvvv'] = [
                ['www'=>1],
                ['ffff'=>2]
            ];

Answer 2

本來就是這樣，php統一都是map