在Cakephp中验证引导程序表单

<!-- add.ctp -->
<?php echo $this->Form->create('User'); ?>
<?php echo $this->Form->input('username'); ?>
<?php echo $this->Form->input('password'); ?>
<?php echo $this->Form->end('Submit'); ?>

// UsersController.php
public function add() {
    if ($this->request->is('post')) {
        $this->User->set($this->request->data);
        if ($this->User->validates()) {
            // 验证通过，继续处理表单数据
        } else {
            // 验证失败，显示错误消息并重新显示表单
            $this->Flash->error('Validation failed!');
        }
    }
}

// User.php
public $validate = array(
    'username' => array(
        'rule' => 'notEmpty',
        'message' => 'Username is required'
    ),
    'password' => array(
        'rule' => 'notEmpty',
        'message' => 'Password is required'
    )
);