AddToCart.php

<?php // <--- do NOT put anything before this PHP tag

include_once('./functions.php');


// Did the user click the buy button AND did they provide a ProductID?
if (!isset($_POST['BuyButton']) && !isset($_POST['Quantity']) && !isset($_GET['ProductID'])) {
	include "./views/partials/head.php";
	include "./views/Error.view.php";
} else {

	$productToBuy = trim($_GET['ProductID']);

	// add the product to the shopping cart cookie
	// if the cookie is defined AND not an empty string
	if (isset($_COOKIE['ShoppingCart']) && $_COOKIE['ShoppingCart'] != "") {

		// TODO: Get the list of items in the shopping cart.
		// and then add the $productToBuy to the end of the comma separated list.
		// TODO: set the "ShoppingCart" cookie (notice the capital letters).
		// setcookie(...);
		$items = str_getcsv($_COOKIE['ShoppingCart']);
		$items[] = $productToBuy . "=" . $_POST['Quantity'];
		setcookie('ShoppingCart', implode(",", $items));
	} else {
		// add this producuID to the shopping cart.
		// because this is the first item in the cart no commas are required.

		// TODO: set the "ShoppingCart" cookie (notice the capital letters).
		// setcookie(...);
		setcookie("ShoppingCart", (string) $productToBuy . "=" . $_POST['Quantity']);
	}

	// redirect the user back to ViewProduct.php 
	$redirection = $_SERVER['HTTP_REFERER'] ?? "./ViewProduct.php?ProductID=$productToBuy";
	redirect($redirection);
}