PHP - PHPCAKE absolute path root

<?php

namespace App\Controller;

use App\Controller\AppController;

class PostsController extends AppController

{

   public $helpers = array('Html', 'Form');

   public function index() {

      $this->set('posts', $this->Post->find('all'));

   }

   public function view($id = null) {

      if (!$id) {

        throw new NotFoundException(__('Entrada de Blog inválida'));

      }

      $post = $this->Post->findById($id);

      if (!$post) {

        throw new NotFoundException(__('Entrada de Blog inválida'));

      }

      $this->set('post', $post);

   }

}

?>