class User
{
    public $id;
    public $name;
    public $email;
    public $password;

    public function save()
    {
        // 将保存更改为数据库
    }
}

class UserController
{
    public function create()
    {
        // 处理用户注册<a style='color:#f60; text-decoration:underline;' href="https://www.php.cn/zt/39720.html" target="_blank">表单提交</a>
        $user = new User();
        $user->name = filter_input(INPUT_POST, 'name');
        $user->email = filter_input(INPUT_POST, 'email');
        $user->password = password_hash(filter_input(INPUT_POST, 'password'), PASSWORD_DEFAULT);
        $user->save();

        // 显示成功页面
        header('Location: success.php');
    }
}

<form action="user/create" method="post">
  <label for="name">姓名：</label>
  <input type="text" name="name" id="name">
  <label for="email">邮箱：</label>
  <input type="email" name="email" id="email">
  <label for="password">密码：</label>
  <input type="password" name="password" id="password">
  <input type="submit" value="注册">
</form>