Codeigniter Guide File Uploading Class

Codeigniter's Uploading Class lets people upload any type of file as long as it is set as allowed type to upload.

$config['allowed_types'] = 'jpg|png|gif';

Official Documentation: CodeIgniter User Guide Version 1.7.2 File Uploading Class

In my case, I tried to upload an excel file (.xls), so I set the allowed type to xls.

$config['allowed_types'] = 'xls';
But it returns an error The filetype you are attempting to upload is not allowed. So I tried to create my uploading class and it extends to CI_Upload class.

./application/libraries/MY_Upload.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class MY_Upload extends CI_Upload
{
 function __construct($props = array())
 {
  parent::CI_Upload($props);
 }
 
 /**
  * Verify that the filetype is allowed
  *
  * @access public
  * @return bool
  */ 
 public function is_allowed_filetype()
 {
  if (count($this->allowed_types) == 0 OR ! is_array($this->allowed_types))
  {
   $this->set_error('upload_no_file_types');
   return FALSE;
  }

  $image_types = array('gif', 'jpg', 'jpeg', 'png', 'jpe');

  
  
  foreach ($this->allowed_types as $val)
  {
   $mime = $this->mimes_types(strtolower($val));

   // Images get some additional checks
   if (in_array($val, $image_types))
   {
    if (getimagesize($this->file_temp) === FALSE)
    {
     return FALSE;
    }
   }

   if (is_array($mime))
   {
    if (in_array($this->file_type, $mime, TRUE))
    {
     return TRUE;
    }
   }
   else
   {
    if ($mime == $this->file_type)
    {
     return TRUE;
    } 
   }
   
   // Last option compare the .ext file with allowed_types
   if(is_array($this->allowed_types))
   {
    if(in_array($val, $this->allowed_types))
    {
     return TRUE;
    }
   }
   elseif($this->allowed_types == $val)
   {
    return TRUE;
   }
  }
  
  return FALSE;
 }
}
/* End of file MY_Upload.php */
/* Location: ./application/library/MY_Upload.php */