When I went to this URL: http://localhost/webmodify/Shoppycart/add_to_cart/

Question

I found this type of error:
Type: ArgumentCountError
Message: Too few arguments to function Shoppycart::add_to_cart(), 0
passed in C:\xampp\htdocs\webmodify\system\core\CodeIgniter.php
on line 533 and exactly 1 expected

Filename:
C:\xampp\htdocs\webmodify\application\controllers\Shoppycart.php

Line Number: 18

Backtrace:

File: C:\xampp\htdocs\webmodify\index.php Line: 315 Function:
require_once

Shoppycart.php

<?php 

defined('BASEPATH') OR exit('No direct script access allowed');
  
class Shoppycart extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->model('Cart_model');
       

    }
    public function index(){
        redirect('test');
    }

    // Add an item to the cart
    public function add_to_cart($product_id) {

     
        // Fetch product details from the database using the $product_id
        $product = $this->Cart_model->get_product_by_id($product_id);

        if ($product) {
            // Prepare cart item data
            $cart_item = array(
                'id'      => $product->id,
                'qty'     => 1, // You can adjust the quantity as needed
                'price'   => $product->price,
                'name'    => $product->name,
                'options' => array('image' => $product->image_url)
            );
            

            // Add the item to the cart
            $this->cart->insert($cart_item);

            // Redirect to the cart page or a success message
            // redirect('Shoppycart/view_cart');
            // redirect(base_url()."Shoppycart/view_cart/(:any)");
            redirect('Shoppycart/view_cart');


        } else {
            // Handle the case when the product is not found
            echo "Product not found!";
        }
    }

    public function view_cart(){
        $this->load->view('product/cart_view');

    }

Cart_model.php

<?php
 
class Cart_model extends CI_Model {
    
    public function __construct() {
        parent::__construct();
        $this->load->database();
    }

    // Create a new cart item
    public function get_product_by_id($product_id) {
  

    $this->db->where('id', $product_id);
        return $this->db->get('products')->row();
       
    
}

cart_view.php

<html>
<head>
<title>My Form</title>
</head>

<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/tailwind.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/alpine.min.js" defer></script>

<body>


<?php echo form_open('Shoppycart/add_to_cart/'); ?>

<div class="w-full overflow-x-auto">
    <table class="min-w-full">
        <thead>
            <tr>
                <th class="py-2 px-4">QTY</th>
                <th class="py-2 px-4">Item Description</th>
                <th class="py-2 px-4 text-right">Item Price</th>
                <th class="py-2 px-4 text-right">Sub-Total</th>
            </tr>
        </thead>
        <tbody>
            <?php $i = 1; ?>
            <?php foreach ($this->cart->contents() as $items): ?>
                <?php echo form_hidden($i.'[rowid]', $items['rowid']); ?>
                <tr>
                    <td class="py-2 px-4">
                        <?php echo form_input(array('name' => $i.'[qty]', 'value' => $items['qty'], 'maxlength' => '3', 'size' => '5', 'class' => 'w-full px-2 py-1 border rounded')); ?>
                    </td>
                    <td class="py-2 px-4">
                       
                        <div>
                <img class="object-scale-down h-48 w-96" src="<?php echo base_url($items['options']['image']); ?>" alt="<?php echo $items['name']; ?>">
                      </div>

                        <?php if ($this->cart->has_options($items['rowid']) == TRUE): ?>
                            <p>
                                <?php foreach ($this->cart->product_options($items['rowid']) as $option_name => $option_value): ?>
                                    <strong><?php echo $option_name; ?>:</strong> <?php echo $option_value; ?><br />
                                <?php endforeach; ?>
                            </p>
                        <?php endif; ?>
                    </td>
                    <td class="py-2 px-4 text-right"><?php echo $this->cart->format_number($items['price']); ?></td>
                    <td class="py-2 px-4 text-right">$<?php echo $this->cart->format_number($items['subtotal']); ?></td>
                </tr>
                <?php $i++; ?>
            <?php endforeach; ?>
            <tr>
                <td colspan="2"></td>
                <td class="py-2 px-4 text-right"><strong>Total</strong></td>
                <td class="py-2 px-4 text-right">$<?php echo $this->cart->format_number($this->cart->total()); ?></td>
            </tr>
        </tbody>
    </table>
    <p class="text-center">
    <a href="<?php echo site_url('Shoppycart/add_to_cart/' . $items['id']); ?>">Add to Cart</a>
    </p>
</div>

</body>
</html>

routes.php

$route['default_controller'] = 'Shoppycart';
$route['Shoppycart/add_to_cart/(:num)'] = 'Shoppycart/add_to_cart/$1';

Retrieve and display cart items and also add an item to the cart

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