PHP를 통해 간단한 온라인 시험 시스템을 작성하는 방법

<?php
    // 处理用户注册
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $username = $_POST['username'];
        $password = $_POST['password'];
        
        // 将用户名和密码存储在数据库中
        
        header("Location: login.php");
        exit();
    }
?>

<form action="" method="POST">
    <label for="username">用户名:</label>
    <input type="text" id="username" name="username">
    <br>
    <label for="password">密码:</label>
    <input type="password" id="password" name="password">
    <br>
    <input type="submit" value="注册">
</form>

<?php
    // 处理用户登录
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $username = $_POST['username'];
        $password = $_POST['password'];
        
        // 从数据库中查找匹配的记录
        
        if (有匹配记录) {
            header("Location: index.php");
            exit();
        } else {
            $errorMessage = "用户名或密码错误";
        }
    }
?>

<form action="" method="POST">
    <label for="username">用户名:</label>
    <input type="text" id="username" name="username">
    <br>
    <label for="password">密码:</label>
    <input type="password" id="password" name="password">
    <br>
    <input type="submit" value="登录">
</form>

<?php
    // 处理添加题目
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $question = $_POST['question'];
        $option_a = $_POST['option_a'];
        $option_b = $_POST['option_b'];
        $option_c = $_POST['option_c'];
        $option_d = $_POST['option_d'];
        $answer = $_POST['answer'];
        
        // 将题目存储在数据库中
        
        header("Location: manage_questions.php");
        exit();
    }
?>

<form action="" method="POST">
    <label for="question">题目:</label>
    <input type="text" id="question" name="question">
    <br>
    <label for="option_a">选项A:</label>
    <input type="text" id="option_a" name="option_a">
    <br>
    <label for="option_b">选项B:</label>
    <input type="text" id="option_b" name="option_b">
    <br>
    <label for="option_c">选项C:</label>
    <input type="text" id="option_c" name="option_c">
    <br>
    <label for="option_d">选项D:</label>
    <input type="text" id="option_d" name="option_d">
    <br>
    <label for="answer">答案:</label>
    <input type="text" id="answer" name="answer">
    <br>
    <input type="submit" value="添加题目">
</form>

<?php
    // 处理创建考试
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $exam_name = $_POST['exam_name'];
        $exam_time = $_POST['exam_time'];
        
        // 将考试存储在数据库中
        
        header("Location: manage_exams.php");
        exit();
    }
?>

<form action="" method="POST">
    <label for="exam_name">考试名称:</label>
    <input type="text" id="exam_name" name="exam_name">
    <br>
    <label for="exam_time">考试时间:</label>
    <input type="text" id="exam_time" name="exam_time">
    <br>
    <input type="submit" value="创建考试">
</form>

<?php
    // 获取考试题目和答案
    $questions = // 从数据库中获取题目
    
    // 处理学生提交的考试答案
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $answers = // 从POST数据中获取学生答案
        
        // 自动评分学生考试
        
        // 生成考试报告
        
        header("Location: exam_report.php");
        exit();
    }
?>

<form action="" method="POST">
    <?php foreach ($questions as $question) : ?>
        <h4><?php echo $question['question']; ?></h4>
        <input type="radio" name="answer_<?php echo $question['id']; ?>" value="A"> <?php echo $question['option_a']; ?><br>
        <input type="radio" name="answer_<?php echo $question['id']; ?>" value="B"> <?php echo $question['option_b']; ?><br>
        <input type="radio" name="answer_<?php echo $question['id']; ?>" value="C"> <?php echo $question['option_c']; ?><br>
        <input type="radio" name="answer_<?php echo $question['id']; ?>" value="D"> <?php echo $question['option_d']; ?><br>
    <?php endforeach; ?>
    <br>
    <input type="submit" value="提交考试">
</form>

<?php
    // 从数据库中获取学生考试答案和正确答案
    $student_answers = // 从数据库中获取学生考试答案
    $correct_answers = // 从数据库中获取正确答案
    
    // 计算得分和生成考试报告
    $score = 0;
    $total_questions = // 计算总题数
    $correct_count = 0;
    
    foreach ($student_answers as $index => $student_answer) {
        if ($student_answer == $correct_answers[$index]) {
            $score++;
            $correct_count++;
        }
    }
    
    $score_percentage = $score / $total_questions * 100;
    
    // 显示考试报告
    echo "总题数: " . $total_questions . "<br>";
    echo "正确数: " . $correct_count . "<br>";
    echo "得分: " . $score . "<br>";
    echo "得分百分比: " . $score_percentage . "%";
?>