Codeigniter - XSS Prevention

xss.php

<?php

class Xss extends CI_Controller {

	public function index() {

		$this->load->helper("form");

		echo form_open("xss/show", array("method" => "POST"));

		echo form_textarea(array("name" => "code"));
		echo "<br>";
		echo form_submit(array("value" => "Please Submit"));
		echo form_close();
	}

	public function show() {

		$this->load->library("input");

		$code = $this->input->post("code");

		echo $code;
		//echo $this->security->xss_clean($code);
	}
}