if($_FILES['file_info']['name']){
 $config['upload_path'] = $GLOBALS['path'];
 $config['file_name'] = strtolower($_FILES['file_info']['name']);
 $config['allowed_types'] = 'gif|jpg|png|txt|xlsx|xls|ppt|pptx|doc|pdf|hwp';
 $config['max_size'] = '10240';    //10mb
 $config['max_filename']  = '100';
 $config['file_field'] = 'file_info';
 $config['remove_spaces'] = FALSE;

 $this->load->library('upload', $config);
                
 if (!$this->upload->do_upload($config['file_field'])) {
  $file_error = $this->upload->display_errors();
 }else{$file_error = '';}
}

if($file_error){
 echo $_FILES['file_info']['type'];
 $file_error = str_ireplace("</p>","",str_ireplace("<p>","",$file_error));
 echo "<script type='text/javascript'>alert('$file_error');history.go(-1);</script>";
 return FALSE;
}

'hwp' => array('application/haansofthwp', 'application/x-hwp', 'application/unknown', 'application/msword', 'application/octet-stream', 'application/zip', 'text/plain', 'text/xml'),