动态表单输入中多答案数据处理教程

<input type="text" name="question" value="q1"/>
<input type="text" name="answer-1" value="a1"/> <!-- 假设1是答案ID -->
<input type="text" name="answer-2" value="a2"/> <!-- 假设2是答案ID -->
<input type="text" name="answer-3" value="a3"/> <!-- 假设3是答案ID -->

<?php
// 假设 $question 包含问题数据
// 假设 $answers 是一个包含答案对象的数组，每个对象有 id 和 answer 属性

// 示例数据
$question = ['id' => 1, 'text' => 'q1'];
$answers = [
    ['id' => 1, 'text' => 'a1', 'is_correct' => 0],
    ['id' => 2, 'text' => 'a2', 'is_correct' => 0],
    ['id' => 3, 'text' => 'a3', 'is_correct' => 1],
];
?>

<form method="POST" action="update_quiz.php">
    <label for="question_text">问题:</label>
    <input type="text" name="question" id="question_text" value="<?= htmlspecialchars($question['text']) ?>"/><br/>

    <?php foreach ($answers as $answer): ?>
        <label for="answer_<?= $answer['id'] ?>">答案 (ID: <?= $answer['id'] ?>):</label>
        <!-- 关键：将答案ID作为数组键名 -->
        <input type="text" name="answers[<?= $answer['id'] ?>]" id="answer_<?= $answer['id'] ?>" value="<?= htmlspecialchars($answer['text']) ?>"/><br/>
    <?php endforeach; ?>

    <button type="submit">更新</button>
</form>

$_POST = [
    'question' => 'q1',
    'answers' => [
        '1' => 'a1_updated', // 答案ID 1 的新值
        '2' => 'a2_updated', // 答案ID 2 的新值
        '3' => 'a3_updated', // 答案ID 3 的新值
    ]
];

<?php
// update_quiz.php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $questionText = $_POST['question'] ?? '';
    $answersToUpdate = [];

    foreach ($_POST as $inputName => $inputValue) {
        // 检查键名是否以 'answer-' 开头
        if (strpos($inputName, 'answer-') === 0) {
            // 提取答案ID
            $answerId = (int) substr($inputName, strlen('answer-'));
            // 存储答案ID和值
            $answersToUpdate[$answerId] = $inputValue;
        }
    }

    // 此时 $answersToUpdate 数组结构为: [ '1' => 'a1_new', '2' => 'a2_new' ]
    // 可以对 $questionText 和 $answersToUpdate 进行数据库更新操作
    echo "问题内容: " . htmlspecialchars($questionText) . "<br>";
    echo "待更新答案:<br>";
    foreach ($answersToUpdate as $id => $value) {
        echo "ID: " . $id . ", 值: " . htmlspecialchars($value) . "<br>";
        // 示例：执行数据库更新
        // $stmt = $pdo->prepare("UPDATE answers SET answer = ? WHERE id = ?");
        // $stmt->execute([$value, $id]);
    }
    echo "数据更新成功！";
}
?>

<?php
// update_quiz.php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $questionText = $_POST['question'] ?? '';
    $answersData = $_POST['answers'] ?? []; // 直接获取到关联数组

    // 更新问题
    // $stmt = $pdo->prepare("UPDATE questions SET question = ? WHERE id = ?");
    // $stmt->execute([$questionText, $questionId]); // 假设 $questionId 已知

    // 遍历答案数据进行更新
    echo "问题内容: " . htmlspecialchars($questionText) . "<br>";
    echo "待更新答案:<br>";
    foreach ($answersData as $answerId => $answerValue) {
        // $answerId 是答案的数据库ID， $answerValue 是用户提交的新值
        echo "ID: " . htmlspecialchars($answerId) . ", 值: " . htmlspecialchars($answerValue) . "<br>";

        // 示例：执行数据库更新
        // $stmt = $pdo->prepare("UPDATE answers SET answer = ? WHERE id = ?");
        // $stmt->execute([$answerValue, $answerId]);
    }
    echo "数据更新成功！";
}
?>