addtocart.php

<?php
/**
 * Advanced PHP 7 eCommerce Website (https://22digital.co.za)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * @copyright Copyright (c) 22 Digital (https://22digital.co.za)
 * @copyright Copyright (c) Justin Hartman (https://justinhartman.co)
 * @author    Justin Hartman <justin@hartman.me> (https://justinhartman.co)
 * @link      https://github.com/justinhartman/complete-php7-ecom-website GitHub Project
 * @since     0.1.0
 * @license   https://opensource.org/licenses/AGPL-3.0 AGPL-3.0
 */

/**
 * Load the bootstrap file.
 */
require __DIR__ . '/config/bootstrap.php';

if (isset($_GET) & !empty($_GET)) {
    $id = $_GET['id'];
    if (isset($_GET['quant']) & !empty($_GET['quant'])) {
        $quant = $_GET['quant'];
    } else {
        $quant = 1;
    }
    $_SESSION['cart'][$id] = array("quantity" => $quant);
    header('location: cart.php');
} else {
    header('location: cart.php');
}