使用CakePHP实现简单的用户注册和登录功能

本示例代码基于CakePHP框架实现了用户注册和登录功能，利用CakePHP内置的Auth组件实现用户身份验证。用户可以在网站上完成注册并登录，同时也可以修改个人信息和密码。

// 注册函数
public function register() {
    // 接收表单数据
    if ($this->request->is('post')) {
        $user = $this->Users->newEntity($this->request->data);
        if ($this->Users->save($user)) {
            // 注册成功后自动登录
            if ($this->Auth->login($user)) {
                return $this->redirect($this->Auth->redirectUrl());
            }
        } else {
            $this->Flash->error(__('The user could not be saved. Please, try again.'));
        }
    }
}

// 登录函数
public function login() {
    // 判断用户是否已登录
    if ($this->Auth->user()) {
        return $this->redirect($this->Auth->redirectUrl());
    }
    // 接收表单数据
    if ($this->request->is('post')) {
        $user = $this->Auth->identify();
        if ($user) {
            $this->Auth->setUser($user);
            return $this->redirect($this->Auth->redirectUrl());
        } else {
            $this->Flash->error(__('Invalid username or password, try again'));
        }
    }
}

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