PHP 从 JSON 转换为 stdClass、进行更改然后转换回 JSON 时遇到问题

Question

因此，一开始，在加载 send_sms.php 之前，我将此 Json 存储在数据库中：

{
"chats": {
    "chat": [{
        "id": "1",
        "name": "Ethan Wilberforce",
        "messages": {
            "message": [{
                "id": "1",
                "name": "Ethan Wilberforce",
                "text": "Hello how are you doing",
                "time": "4:41"
            }, {
                "id": "2",
                "name": "Qasim Iqbal",
                "text": "Not bad. How about you?",
                "time": "4:42"
            }, {
                "id": "3",
                "name": "Ethan Wilberforce",
                "text": "I'm not too bad myself.",
                "time": "4:43"
            }]
        }
    }, {
        "id": "2",
        "name": "Geoff Vahaaho",
        "messages": {
            "message": [{
                "id": "1",
                "name": "Geoff Vahaaho",
                "text": "Hello how are you doing",
                "time": "4:41"
            }, {
                "id": "2",
                "name": "Qasim Iqbal",
                "text": "Not bad. How about you?",
                "time": "4:42"
            }, {
                "id": "3",
                "name": "Geoff Vahaaho",
                "text": "I'm not too bad myself.",
                "time": "4:43"
            }, {
                "id": "4",
                "name": "Qasim Iqbal",
                "text": "Nice.",
                "time": "4:43"
            }]
        }
    }]
}
}

Json 完全有效，没有错误。它存储两个聊天记录，其中包含消息。

现在，这是更改 Json 的 PHP 代码：

    $data = $user->data;
    $parsed_data = json_decode($data);

        ...

    for($i = 0, $size = sizeof($parsed_data->chats->chat); $i < $size; ++$i) {
        if($parsed_data->chats->chat[$i]->name == $to) {
            $found = true;
            $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)] = new stdClass;
            $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)]->id = sizeof($parsed_data->chats->chat[$i]->messages->message);
            $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)]->name = $user->name;
            $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)]->text = $message;
            $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)]->time = $time;
            echo "done. ";
            break;
        }
    }

我的目的是在聊天的“message”数组中添加另一个 stdClass 对象。所以我基本上就是这么做的，希望它能奏效。

现在，它可以工作了，但是这是我们对它进行 json_encode 后的新 Json：

{
"chats": {
    "chat": [{
        "id": "1",
        "name": "Ethan Wilberforce",
        "messages": {
            "message": [{
                "id": "1",
                "name": "Ethan Wilberforce",
                "text": "Hello how are you doing",
                "time": "4:41"
            }, {
                "id": "2",
                "name": "Qasim Iqbal",
                "text": "Not bad. How about you?",
                "time": "4:42"
            }, {
                "id": "3",
                "name": "Ethan Wilberforce",
                "text": "I'm not too bad myself.",
                "time": "4:43"
            }, {}, {
                "id": 4
            }, {
                "name": "Qasim Iqbal"
            }, {
                "text": "Hello i am testing"
            }, {
                "time": 1326066200
            }]
        }
    }, {
        "id": "2",
        "name": "Geoff Vahaaho",
        "messages": {
            "message": [{
                "id": "1",
                "name": "Geoff Vahaaho",
                "text": "Hello how are you doing",
                "time": "4:41"
            }, {
                "id": "2",
                "name": "Qasim Iqbal",
                "text": "Not bad. How about you?",
                "time": "4:42"
            }, {
                "id": "3",
                "name": "Geoff Vahaaho",
                "text": "I'm not too bad myself.",
                "time": "4:43"
            }, {
                "id": "4",
                "name": "Qasim Iqbal",
                "text": "Nice.",
                "time": "4:43"
            }]
        }
    }]
}
}

您会注意到它确实被添加到“Ethan Wilberforce”聊天中，但是 stdClass 中的每个字符串都被转换为“消息”数组。我该如何解决这个问题？非常感谢。

Answer 1

你的问题是这样的：

        $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)] = new stdClass;
        $parsed_data->chats->chat[$i]->messages->message[sizeof($parsed_data->chats->chat[$i]->messages->message)]->id = sizeof($parsed_data->chats->chat[$i]->messages->message);

它基本上相当于：

$array[$last] = new stdClass();
$array[$last+1] = "id";
$array[$last+2] = "name";

你不断追加新的数组/对象，因为你使用 sizeof(...) 它总是比前一行大。它不是最后一个索引，而是大小。这是$lastindex+1。

无论如何，你应该做的不是使用对象，而只是附加一个数组，并立即添加它的所有属性：

 $parsed_data->chats->chat[$i]->messages->message[] = array(
      "id" => ...,
      "name" => ...,
      "time" => ...,
 );

当你将该关联数组编码回 JSON 时，它也将成为一个普通的 {...} JSON 对象组。