PHPを使用してWeChatアプレットのオンライン評価機能を実装するにはどうすればよいですか?

<?php

$appid = 'YOUR_APPID';
$secret = 'YOUR_APP_SECRET';
$code = $_GET['code'];

$url = 'https://api.weixin.qq.com/sns/jscode2session?appid=' . $appid . '&secret=' . $secret . '&js_code=' . $code . '&grant_type=authorization_code';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
curl_close($ch);

$data = json_decode($result, true);

$openid = $data['openid'];
$session_key = $data['session_key'];

?>

<?php

$servername = 'YOUR_DB_SERVER';
$username = 'YOUR_DB_USERNAME';
$password = 'YOUR_DB_PASSWORD';
$dbname = 'YOUR_DB_NAME';

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = 'SELECT * FROM questions';
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $questions = array();
    while ($row = $result->fetch_assoc()) {
        $questions[] = $row;
    }

    // 返回题目数据给小程序端
    echo json_encode($questions);
} else {
    echo 'No questions found.';
}

$conn->close();

?>

<?php

$servername = 'YOUR_DB_SERVER';
$username = 'YOUR_DB_USERNAME';
$password = 'YOUR_DB_PASSWORD';
$dbname = 'YOUR_DB_NAME';

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$openid = $_GET['openid'];
$answers = $_POST['answers'];

$sql = 'INSERT INTO answers (openid, answers) VALUES (' . $openid . ', ' . $answers . ')';
if ($conn->query($sql) === TRUE) {
    echo 'Answers saved successfully.';
} else {
    echo 'Error: ' . $sql . '<br>' . $conn->error;
}

$conn->close();

?>