addtowishlist.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';

// We use ouput buffering here because we want to modify the headers after
// sending the content when we redirect the user to the login page.
ob_start();
$uid = $_SESSION['customerid'];

if (!isset($_SESSION['customer']) & empty($_SESSION['customer'])) {
    header('location: login.php');
}

if (isset($_GET['id']) & !empty($_GET['id'])) {
    $pid = $_GET['id'];
    echo $sql = "INSERT INTO `wishlist` (`pid`, `uid`) VALUES ('$pid', '$uid')";
    $res = mysqli_query($connection, $sql);
    if ($res) {
        header('location: wishlist.php');
    }
} else {
    header('location: wishlist.php');
}

// Flush the output buffering cache.
ob_flush();