cart_update.php

<?php
session_start();
include_once("config.php");

//empty cart by distroying current session
if(isset($_GET["emptycart"]) && $_GET["emptycart"]==1)
{
	$return_url = base64_decode($_GET["return_url"]); //return url
	session_destroy();
	header('Location:'.$return_url);
}

//add item in shopping cart
if(isset($_POST["type"]) && $_POST["type"]=='add')
{
	$product_code 	= filter_var($_POST["product_code"], FILTER_SANITIZE_STRING); // product code
	$product_qty 	= filter_var($_POST["product_qty"], FILTER_SANITIZE_NUMBER_INT); // product code
	$product_unit	= filter_var($_POST["product_unit"], FILTER_SANITIZE_STRING); // product code
	$qty1st			= filter_var($_POST["qty1st"], FILTER_SANITIZE_NUMBER_INT); // product code
	$qty2nd			= filter_var($_POST["qty2nd"], FILTER_SANITIZE_NUMBER_INT); // product code
	$qty3rd			= filter_var($_POST["qty3rd"], FILTER_SANITIZE_NUMBER_INT); // product code
	$qty4th			= filter_var($_POST["qty4th"], FILTER_SANITIZE_NUMBER_INT); // product code
	$return_url 	= base64_decode($_POST["return_url"]); //return url

	//limit quantity for single product
	//if($product_qty > 10){
	//	die('<div align="center">This demo does not allowed more than 10 quantity!<br /><a href="http://sanwebe.com/assets/paypal-shopping-cart-integration/">Back To Products</a>.</div>');
	//}

	//MySqli query - get details of item from db using product code
	$results = $mysqli->query("SELECT * FROM app WHERE counter='$product_code' LIMIT 1");
	$obj = $results->fetch_object();

	if ($results) { //we have the product info

		//prepare array for the session variable
		$new_product = array(array('name'=>$obj->item_name, 'code'=>$product_code, 'qty'=>$product_qty, 'price'=>$obj->price, 'unit'=>$product_unit, 'qty1st'=>$qty1st
									, 'qty2nd'=>$qty2nd, 'qty3rd'=>$qty3rd, 'qty4th'=>$qty4th));

		if(isset($_SESSION["wala"])) //if we have the session
		{
			$found = false; //set found item to false

			foreach ($_SESSION["wala"] as $cart_itm) //loop through session array
			{
				if($cart_itm["code"] == $product_code){ //the item exist in array
					$product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$product_qty, 'price'=>$cart_itm["price"], 'unit'=>$cart_itm["unit"], 'qty1st'=>$qty1st, 'qty2nd'=>$qty2nd, 'qty3rd'=>$qty3rd, 'qty4th'=>$qty4th);
					$found = true;
				}else{
					//item doesn't exist in the list, just retrive old info and prepare array for session var
					$product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$cart_itm["qty"], 'price'=>$cart_itm["price"], 'unit'=>$cart_itm["unit"], 'qty1st'=>$cart_itm["qty1st"]
					, 'qty2nd'=>$cart_itm["qty2nd"], 'qty3rd'=>$cart_itm["qty3rd"], 'qty4th'=>$cart_itm["qty4th"]);
				}
			}

			if($found == false) //we didn't find item in array
			{
				//add new user item in array
				$_SESSION["wala"] = array_merge($product, $new_product);
			}else{
				//found user item in array list, and increased the quantity
				$_SESSION["wala"] = $product;
			}

		}else{
			//create a new session var if does not exist
			$_SESSION["wala"] = $new_product;
		}
	}
	//redirect back to original page
	header('Location:'.$return_url);
}
//remove item from shopping cart
if(isset($_GET["removep"]) && isset($_GET["return_url"]) && isset($_SESSION["wala"]))
{
	$product_code 	= $_GET["removep"]; //get the product code to remove
	$return_url 	= base64_decode($_GET["return_url"]); //get return url

	foreach ($_SESSION["wala"] as $cart_itm) //loop through session array var
	{
		if($cart_itm["code"]!=$product_code){ //item does,t exist in the list
			$product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$cart_itm["qty"], 'price'=>$cart_itm["price"], 'unit'=>$cart_itm["unit"], 'qty1st'=>$cart_itm["qty1st"]
			, 'qty2nd'=>$cart_itm["qty2nd"], 'qty3rd'=>$cart_itm["qty3rd"], 'qty4th'=>$cart_itm["qty4th"]);
		}
		//create a new product list for cart
		$_SESSION["wala"] = $product;
	}
	//redirect back to original page
	header('Location:'.$return_url);
}
?>