its showing variable undefined - codeigniter

Question

This is My Controller page
class Cart extends CI_Controller{
public function index()
{
$getALlCat = $this->Product_model-> getAllCategory();
$data = array();
//Retrieve cart Data
$data['cartItems'] = $this->cart->contents();
//print_r($data);exit;
//$this->load->view('cart/index' ,$data);
///$this->load->helper('url');
/ /$this->load->view('cart/header',['getAllCate'=>$getALlCat], $data); //including header and
footer
$this->load->view('cart/cartbody',['getAllCate'=>$getALlCat], $data);
$this->load->view('common/footer'); //including header and footer
}
}
**This is View page**
<tbody>
<?php if($this->cart->total_items() > 0){ foreach($cartItems as $item){ ?>
<tr>
<td><img src="<?php echo $item['product_image']; ?>" width="50"/></td>
<td><?php echo $item['product_name']; ?></td>
<td><?php echo '$'.$item["product_price"].' USD'; ?></td>
<td><input type="number" class="form-control text-center"></td>
<td><?php echo '$'.$item["subtotal"].' USD'; ?></td>
<td>Are you sue</td>
</tr>
<?php } }else{ ?>
<td colspan="6"><p>Your cart is empty.....</p></td>
<?php } ?>
</tbody>
**Error Showing like this**
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: cartItems
Filename: cart/cartbody.php
Line Number: 217
Backtrace:
File: C:\xampp\htdocs\shop\application\views\cart\cartbody.php
Line: 217
Function: _error_handler
File: C:\xampp\htdocs\shop\application\controllers\Cart.php
Line: 33
Function: view
File: C:\xampp\htdocs\shop\index.php
Line: 315
Function: require_once

Answer 1

You can store multiple values as an array key of $data and then send only $data to view and use those key to retrieve values. I've rectified your code below and it should work as your needs. I've mentioned comments wherever necessary.
public function index() {
$data = array();
$data['getALlCate'] = $this->Product_model-> getAllCategory(); // store it in an array instead (I've changed it to getALlCate from getALlCat, so you don't have to change anything in your view)
//Retrieve cart Data
$data['cartItems'] = $this->cart->contents();
//$this->load->view('cart/header', $data); // including header and footer
$this->load->view('cart/cartbody', $data);
$this->load->view('common/footer'); //including header and footer
}
}
// you can retrieve data in view by accessing $cartItems and $getALlCate variables.
Hope it helps you.

Answer 2

Try following
$this->load->view('cart/cartbody',['getAllCate'=>$getALlCat, 'cartItems'=> $this->cart->contents()]);