Codeigniter upload a dynamic number of files

upload_controller.php

<?php if(!defined('BASEPATH')) exit("No direct script access allowed.");

class Upload_test extends CI_Controller {

  public function index() {
    
    if($this->input->post('submit')) {
      $config['upload_path']    = BASEPATH.'../uploads';
      $config['allowed_types']  = 'txt';

      $this->load->library('upload', $config);

      if(empty($_FILES) {
        //redirect or do something else to stop execution
      }

      foreach ($_FILES as $key => $value) { //THIS IS THE CRUCIAL PART
        $this->upload->do_upload($key);
        var_dump($this->upload->data());
        var_dump($this->upload->display_errors());
      }
      exit();
    }
    
    $this->load->helper('form');
    $this->load->view('upload_test');
  
  }

  //I have no idea why more complex code exists for the same thing elsewhere on the 'net!

}

@adityamenon Aha, I came here from a reshare on G+, not because I'm interested in CI itself :)