Laravel中构建复杂嵌套JSON结构：处理多层数组的技巧

[
    {
        "q": "What number is the letter A in the English alphabet?",
        "a": [
            {"option": "8", "correct": false},
            {"option": "14", "correct": false},
            {"option": "1", "correct": true},
            {"option": "23", "correct": false}
        ],
        "correct": "<p><span>That's right!</span> The letter A is the first letter in the alphabet!</p>",
        "incorrect": "<p><span>Uhh no.</span> It's the first letter of the alphabet. Did you actually <em>go</em> to kindergarden?</p>"
    }
    // ... 更多问题
]

foreach ($questions as $q) {
    $jsondata[] = [
        "q" => $q->content,
        "a" => [
            // 错误：PHP数组定义中不允许直接嵌入 foreach
            foreach ($q->answers as $a) {
                "option" => $a->content,
                "correct" => $a->correct,
            }
        ]
    ];
}

$jsondata = []; // 初始化最终的JSON数据数组

foreach ($questions as $q) {
    $adata = []; // 为当前问题的答案初始化一个空数组
    foreach ($q->answers as $a) {
        $adata[] = [
            "option" => $a->content,
            "correct" => $a->correct,
        ];
    }

    // 构建当前问题的数据结构，并将之前构建好的答案数组赋值给 'a' 键
    $jsondata[] = [
        "q" => $q->content,
        "a" => $adata,
        // 如果有其他字段，例如 'correct' 和 'incorrect' 消息，也在此处添加
        // "correct" => $q->correct_message,
        // "incorrect" => $q->incorrect_message,
    ];
}

// $jsondata 现在包含了所需格式的数据
// return response()->json($jsondata); // 如果作为API响应返回

// 假设 $questions 是一个 Eloquent Collection，并且每个 Question 模型都有一个 'answers' 关系
$jsondata = $questions->map(function ($question) {
    // 使用 map 方法处理答案集合，构建内部的答案数组
    $answersData = $question->answers->map(function ($answer) {
        return [
            "option" => $answer->content,
            "correct" => (bool) $answer->correct, // 确保正确性为布尔值
        ];
    })->toArray(); // 将集合转换为普通数组

    return [
        "q" => $question->content,
        "a" => $answersData,
        // 如果有其他字段，例如 'correct' 和 'incorrect' 消息
        // "correct" => $question->correct_message,
        // "incorrect" => $question->incorrect_message,
    ];
})->toArray(); // 将最终的集合转换为普通数组

// return response()->json($jsondata);