image manipulation, resize adn unique name

[eluser]the_unforgiven[/eluser]
Hi guys,

I currently have this code which uploads fine to the server folder in the config but i need to resize it them place into thumbs folder with a unqiue name, so can someone adviose how and best way to do it based on my code please?

Code:

function _do_upload_file()
{
     //upload path and config
  $config['upload_path']   = './assets/uploads/userfiles/';
     $config['allowed_types'] = 'png|jpg|gif|jpeg';
     $config['max_size'] = '3000';

     $this->load->library('upload', $config);
  $this->upload->initialize($config);
  
     if (!$this->upload->do_upload())
     {
         $this->form_validation->set_message('_do_upload_file', $this->upload->display_errors());
         return FALSE;
     }
     else
     {
   $filedata = $this->upload->data();
   $this->filename = $filedata['file_name'];
  
         return TRUE;
  }
  

}