How to upload a file and attach it to email using cakephp 2.x?

I am a new learner of cakephp 2.x. I want to build a simple form for user to upload their resume files, and then send them as email attachments. Somehow I can't find a way to attach uploaded file to email. Any help will welcome! Here is my send.ctp:

<?php 
   echo $this -> Form -> create(null, array('enctype' =>'multipart/form-data'));
   echo $this -> Form -> input('first_name', array('type'=>'text')); 
   echo $this -> Form ->input('last_name', array('type'=>'text'));
   echo $this -> Form ->input('contact_number',array('type'=>'text')); 
   echo $this -> Form ->input('email',array('type'=>'text'));
   echo $this -> Form ->input('resume', array('type' => 'file',));
   echo $this -> Form ->end('Submit');      
?>

Here is my HomesController.php

<?php 
   class HomesController extends AppController {
public $name = 'Homes';
public $uses = null;
public $helpers = array('Html', 'Form');

    public function index() {
    }
public function send(){
   if (!empty($this->data)) {
      echo $this->data['last_name'];
      echo $this->data['contact_number'];
      echo $this->data['email'];
          echo $this->data['resume'];

      App::uses('CakeEmail', 'Network/Email');
      $email = new CakeEmail();
      $email->from('[email protected]');
          $email->to('[email protected]');
          $email->subject('About');
          $email->attachments = array($this->data['resume']);
      $email->send($this->data['last_name']);
      $this->redirect(array('action' => 'index'));
   }
     }
   }?>

The email can actually send and be able to receive, but without attachment. When I try "echo $this->data['resume']" it only display a string---'Array'. But other fields like "echo $this->data['last_name']" works properly.

http://cakebaker.42dh.com/2006/04/15/file-upload-with-cakephp/ Above one use database, I don't wanna use database to store files. And it use cakephp 1.x which cannot run in 2.x.

How to do form-based file uploads in CakePHP? This one doesn't say how to attach files to email.

This is my Config/email.php, I use gmail smtp: class EmailConfig {

public $default = array(
    'transport' => 'Smtp',
    'from' => '[email protected]',
    //'charset' => 'utf-8',
    //'headerCharset' => 'utf-8',
);

public $smtp = array(
    'transport' => 'Smtp',
    'from' => array('[email protected]' => 'Sender'),
    'host' => 'smtp.gmail.com',
    'port' => 465,
    'timeout' => 30,
    'username' => 'XXX',
    'password' => '@password',
    'client' => null,
    'log' => false,
    //'charset' => 'utf-8',
    //'headerCharset' => 'utf-8',
);

public $fast = array(
    'from' => 'you@localhost',
    'sender' => null,
    'to' => null,
    'cc' => null,
    'bcc' => null,
    'replyTo' => null,
    'readReceipt' => null,
    'returnPath' => null,
    'messageId' => true,
    'subject' => null,
    'message' => null,
    'headers' => null,
    'viewRender' => null,
    'template' => false,
    'layout' => false,
    'viewVars' => null,
    'attachments' => null,
    'emailFormat' => null,
    'transport' => 'Smtp',
    'host' => 'localhost',
    'port' => 25,
    'timeout' => 30,
    'username' => 'user',
    'password' => 'secret',
    'client' => null,
    'log' => true,
    //'charset' => 'utf-8',
    //'headerCharset' => 'utf-8',
);

}

Copyright Notice：Content Author:「KingBowen」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/13064051/how-to-upload-a-file-and-attach-it-to-email-using-cakephp-2-x