// try it at: http://kanzie.com/bgc/rpc.php?mode=addCart&productid=14,15,16,14,14,15,14

	if ($_GET['mode'] == "addCart") {
		if (isset($_GET['productid'])) {
			$products = explode(",",$_GET['productid']);
			var_dump($products);
			
		if (isset($products)) {
			if (!isset($_SESSION['cart'])) {
				$_SESSION['cart'] = array();
				echo "<br />SESSION Cart not set, setting it <br />";
			} 

			foreach ($products as $key) {
				if (array_key_exists($key,$_SESSION['cart'])) {
					$_SESSION['cart'][$key]++;
					echo "Key " . $key . " exists, incrementing value, value now " . $_SESSION['cart'][$key] . "<br />";
				} else {
					$_SESSION['cart'] = array($key => 1);
					echo "no previous key for " . $key .", setting value 1<br />";
				}
			} // for every productid in productid-POST
		} // no products set in the products= POST
		} // productid-POST is not set
	} // mode is not "addCart"
	echo("<br /><br />");
	print_r(array_values($_SESSION['cart']));