php - 检查答案并从数据库验证它在 PHP 中是否正确

Question

现在从数据库中获取问题并在屏幕上显示什么应该是逻辑部分或如何实现以检查所选答案是否正确以及如何将正确答案存储在数据库中并验证它们。

这是代码

<?php

// Create connection
$conn = new mysqli("localhost","root","","QuizQuestions");

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
} 
echo "Connected successfully<br><br>";

$sql = "SELECT Question, Answer1, Answer2, Answer3, Answer4 FROM Questions";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
// output data of each row
$i = 1;
while ($row = $result->fetch_assoc()) {
echo "<br>Question: " . $row["Question"] . "<br>";
echo ' A) <input type="radio" name="ans' . $i . '" value="' . 
$row["Answer1"] . '">' . $row["Answer1"] . '<br>';
echo ' B) <input type="radio" name="ans' . $i . '" value="' . 
$row["Answer2"] . '">' . $row["Answer2"] . '<br>';
echo ' C) <input type="radio" name="ans' . $i . '" value="' . 
$row["Answer3"] . '">' . $row["Answer3"] . '<br>';
echo ' D) <input type="radio" name="ans' . $i . '" value="' . 
$row["Answer4"] . '">' . $row["Answer4"] . '<br>';
$i++;
}
} else {
echo "0 results";
}
$conn->close();

?>

Answer 1

因为所有 radio 输入都具有相同的名称。他们都将被视为同一个 radio 组。您需要为不同的问题使用不同的名称。有点像 -

$i = 1;
while ($row = $result->fetch_assoc()) {
    echo "<br>Question: " . $row["Question"] . "<br>";
    echo ' A) <input type="radio" name="ans' . $i . '" value="' . $row["Answer1"] . '">' . $row["Answer1"] . '<br>';
    echo ' B) <input type="radio" name="ans' . $i . '" value="' . $row["Answer2"] . '">' . $row["Answer2"] . '<br>';
    echo ' C) <input type="radio" name="ans' . $i . '" value="' . $row["Answer3"] . '">' . $row["Answer3"] . '<br>';
    echo ' D) <input type="radio" name="ans' . $i . '" value="' . $row["Answer4"] . '">' . $row["Answer4"] . '<br>';
    $i++;
}

您还可以使用 id 行代替 $i 行。