How to use PHP to develop simple online testing functions

How to use PHP to develop a simple online testing function

Overview:
The online testing function is often used in education and training, recruitment and selection and other scenarios. By writing PHP code, We can implement a simple online testing function. This article will introduce how to use PHP to develop an online testing system with basic functions and provide specific code examples.

1. Database design:
   First, we need to design a database to store test-related data. Generally speaking, we need to create the following tables:
2. tests table: stores the basic information of the test, such as test name, time limit, etc.;
3. questions table: stores question information, such as Question content, options, etc.;
4. answers table: stores user answer information, including test ID, question ID, user answers, etc.

5. Create a test page:
   Next, we need to create a test page to display test questions and accept user answers.
   Specific code example:

   <?php
   // 获取测试ID
   $test_id = $_GET['test_id'];
   
   // 查询测试信息
   $query = "SELECT * FROM tests WHERE id = $test_id";
   $result = mysqli_query($conn, $query);
   $test_info = mysqli_fetch_assoc($result);
   
   // 查询题目
   $query = "SELECT * FROM questions WHERE test_id = $test_id";
   $result = mysqli_query($conn, $query);
   
   echo "<h2>" . $test_info['name'] . "</h2>";
   echo "<form action='submit.php' method='post'>";
   while ($row = mysqli_fetch_assoc($result)) {
    echo "<h3>" . $row['content'] . "</h3>";
    echo "<input type='hidden' name='question_id[]' value='" . $row['id'] . "'>";
    echo "<input type='radio' name='answer[" . $row['id'] . "]' value='A'>" . $row['option_a'] . "<br>";
    echo "<input type='radio' name='answer[" . $row['id'] . "]' value='B'>" . $row['option_b'] . "<br>";
    echo "<input type='radio' name='answer[" . $row['id'] . "]' value='C'>" . $row['option_c'] . "<br>";
    echo "<input type='radio' name='answer[" . $row['id'] . "]' value='D'>" . $row['option_d'] . "<br>";
   }
   echo "<input type='submit' value='提交'>";
   echo "</form>";
   ?>

6. Submit answer:
   After the user submits the answer, we need to save the answer to the database and calculate the result.
   Specific code example:

   <?php
   // 获取用户答案
   $question_ids = $_POST['question_id'];
   $answers = $_POST['answer'];
   
   // 遍历用户答案
   foreach ($answers as $question_id => $answer) {
    // 将用户答案插入数据库
    $query = "INSERT INTO answers (test_id, question_id, user_answer) VALUES ($test_id, $question_id, '$answer')";
    mysqli_query($conn, $query);
   }
   
   // 根据答案计算得分等逻辑
   ...
   
   // 显示最终结果
   echo "你的得分是：";
   echo ...
   ?>

Conclusion:
Through the above steps, we can complete a simple online testing function. Of course, this is just a basic implementation and you can expand and optimize it according to your needs. I hope this article will help you understand how to use PHP to develop online testing functions.

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