在Laravel中构建嵌套数组以适配复杂JSON结构

[
    {
        "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" => $q->content,
        "a" => [
            // 错误：PHP不允许在数组字面量中直接使用 foreach 循环
            foreach ($q->answers as $a) {
                "option" => $a->content,
                "correct" => $a->correct,
            }
        ],
        "correct" => $q->correct_feedback, // 假设存在这些字段
        "incorrect" => $q->incorrect_feedback,
    ];
}

<?php

// 假设 $questions 是从数据库查询出来的集合，每个 $q 对象包含 content, correct_feedback, incorrect_feedback 属性
// 并且每个 $q->answers 也是一个集合，每个 $a 对象包含 content, correct 属性

$jsondata = []; // 初始化最终的数组

foreach ($questions as $q) {
    $answersData = []; // 为每个问题初始化一个空的答案数组

    // 遍历当前问题的所有答案，构建答案子数组
    foreach ($q->answers as $a) {
        $answersData[] = [
            "option" => $a->content,
            "correct" => (bool)$a->correct, // 确保 'correct' 是布尔值
        ];
    }

    // 将构建好的答案子数组和问题信息组合成一个完整的问题对象
    $jsondata[] = [
        "q" => $q->content,
        "a" => $answersData, // 将独立构建的答案数组赋值给 'a' 键
        "correct" => $q->correct_feedback ?? null, // 使用 null 合并运算符处理可能不存在的字段
        "incorrect" => $q->incorrect_feedback ?? null,
    ];
}

// 此时 $jsondata 包含了所有按要求格式化的数据
// 可以将其转换为 JSON 字符串并返回给前端
// return response()->json($jsondata);

<?php

// 假设 $questions 是一个 Laravel Collection

$jsondata = $questions->map(function ($q) {
    $answersData = $q->answers->map(function ($a) {
        return [
            "option" => $a->content,
            "correct" => (bool)$a->correct,
        ];
    })->toArray(); // 将内部 Collection 转换为纯 PHP 数组

    return [
        "q" => $q->content,
        "a" => $answersData,
        "correct" => $q->correct_feedback ?? null,
        "incorrect" => $q->incorrect_feedback ?? null,
    ];
})->toArray(); // 将最终 Collection 转换为纯 PHP 数组

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