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!

}

I used CI some years ago, so I'm not updated at all about its functionality.

Ah okay, that is why we are having slight difficulty aligning thoughts on this - this is more of a quick-solve post, because CI's upload library allows only single file uploads, and it's not clear from the documentation if any input field will work or only the ones created with the CI form helper (making me wonder if there was some sort of 'registration' of file fields required by the library). I wanted to show a simple way of looping the upload library to remove any confusion about it.

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