Stuck on Array issue: $post['Post']['id'] not works now, but $post[0]['id'] is ok

Hi, cakePHPers:

I am an architect,  not quite familiar with CakePHP before, recently after an upgrade to CakePHP 2.4.6, $post['Post']['id'] not works now, but $post[0]['id'] is ok.

I am not sure it's caused by CakePHP or other stacks,  because I upgraded CakePHP from 2.1 to 2.4.6 , CentOS from 6.0 to 6.5, and PHP upgraded from 5.2.14 to 5.5.10 too.

Here's the code and screenshot:

Model/Post.php
<?php 
class Post extends AppModel {
} 

Posts/view.ctp:
<h1><?php echo h($post['Post']['title']); ?></h1> 
<p><small>Created: <?php echo $post['Post']['created']; ?></small></p> 
<p><?php echo $post['Post']['body']; ?></p> 

<h1><?php echo h($post[0]['title']); ?></h1> 
<p><small>Created: <?php echo $post[0]['created']; ?></small></p> 
<p><?php echo $post[0]['body']; ?></p>


PostsController.php:
<?php class PostsController extends AppController { 
   public $helpers = array('Html', 'Form'); 
   public function view($id = null ) { 
       $post = $this->Post->findById($id); 
       print_r($post); 
       $this->set('post', $post); 
   } 
}


Please let me know what's wrong, the code? the upgrade of CakePHP, or other stack issue. Thanks.

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