$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'csv';
$config['max_size']	= '100';
$config['max_width']  = '1024';
$config['max_height']  = '768';

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

if ( ! $this->upload->do_upload())
{
	$error = array('error' => $this->upload->display_errors());
	
	$this->load->view('welcome_message', $error);
}	
else
{
	$file_var = $this->upload->data();
	$data = array('upload_data' => $this->upload->data());

	$fp = fopen($file_var['full_path'],"r");

	while ($fdata = fgetcsv($fp,2048, ",")){
	   print_r($fdata);
	}
	
	$data['error'] = "";
	$this->load->view('welcome_message', $data);
}

$fp = fopen($_FILES['userfile']['tmp_name'],"r");

while ($fdata = fgetcsv($fp,2048, ",")){
   print_r($fdata);
}