如何通过PHP编写一个简单的在线表单生成器

<form action="submit.php" method="POST">
  <label for="name">姓名：</label>
  <input type="text" name="name" id="name">

  <label for="email">邮箱：</label>
  <input type="text" name="email" id="email">

  <input type="submit" value="提交">
</form>

<?php
$host = 'localhost';
$db = 'your_database_name';
$user = 'your_username';
$password = 'your_password';

$dsn = "mysql:host=$host;dbname=$db;charset=utf8mb4";
$options = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES => false,
];

try {
    $pdo = new PDO($dsn, $user, $password, $options);
} catch (PDOException $e) {
    throw new PDOException($e->getMessage(), (int)$e->getCode());
}

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $name = $_POST['name'];
    $email = $_POST['email'];

    $stmt = $pdo->prepare('INSERT INTO users (name, email) VALUES (:name, :email)');
    $stmt->execute([
        ':name' => $name,
        ':email' => $email,
    ]);

    echo '提交成功！';
}

<?php
class FormBuilder {
    public function input($name, $label) {
        return "<label for="$name">$label：</label>
                <input type="text" name="$name" id="$name"><br>";
    }
  
    public function textarea($name, $label) {
        return "<label for="$name">$label：</label>
                <textarea name="$name" id="$name"></textarea><br>";
    }
  
    //添加更多需要的表单字段类型
}

<?php
$formBuilder = new FormBuilder();
echo $formBuilder->input('name', '姓名');
echo $formBuilder->input('email', '邮箱');
echo $formBuilder->textarea('message', '留言');
// 添加更多需要的表单字段