title: Cakephp: setting values to $this->data in controller
body: <p>Is it possible to set values in $this->data which is received in controller from the view.</p>
  
  <p>We can use if($this->data['id']) but why we cant set values in it?</p>
  
  <p>Will this work<code>$this-&gt;data['id']=$userid;</code></p>