a little tough problem here - need a variable

[zang8027]

Ok, i have a shopping cart. I want to make it so that when you add an item from a restaurant.. say the restID = 8, I want to set a variable to 8 that exists as long as my shopping cart. This way, no one can add more than 1 restaurant's item to the same cart.

 

Im using a lot of OOP for this cart so this may be hard for you guys to help me out here but here is some logic of it:

 

 

 class ShoppingCart{
    
	private $items = array();

	//*********FUNCTION ADDITEM*********
	public function AddItem($product_id)
	{

		if(array_key_exists($product_id, $this->items))
			$this->items[$product_id] = $this->items[$product_id] + 1;
		else
			$this->items[$product_id] = 1;

			//SET STATIC VARIABLE THAT EXISTS AS LONG AS CART FOR REST ID.
			//THIS PREVENTS MORE THAN 1 REST (shipping,tax wont change)


	}
}

}

 

 

That function is called when the item is added. SO I want to make a variable that exists through out the rest of the project. I dont want to declare it in there though because that is called everytime something is added and I dont want the user to be able to go back and add another one from a diff store and over write it.

 

Here is my other code:

 

//********************function set shopping cart********************
function set_shopping_cart($cart)
{
    		$_SESSION['cart'] = serialize($cart);
}

<?php
require_once '../functions/Functions.php';

    $shopping_cart = get_shopping_cart();

    //Grab value being passed
   $product_id = $_REQUEST['id'];
   $restID = $_REQUEST['restId'];
   
    if(product_exists($product_id))
    {
      $shopping_cart->AddItem($product_id);
      
    }

     set_shopping_cart($shopping_cart);
  
?>

 

 

few functions in there that are not important to this problem.

 

 

I guess i should first figure out how to make a variable that will stay the same until the user clicks out. Is it a constant or a static variable?

[Psycho]

If I am understanding you correctly, the user may add different products from multiple restaurants - BUT you do not want them to add the same product from different restaurants.

 

How about something like this:

class ShoppingCart
{
    private $items = array();

    //*********FUNCTION ADDITEM*********
    public function AddItem($product_id, $rest_id)
    {
        if(array_key_exists($product_id, $this->items) && $this->rest_id[$product_id] == $rest_id)
        {
            $this->items[$product_id] = $this->items[$product_id] + 1;
        }
        else
        {
            $this->items[$product_id] = 1;
            $this->rest_id[$product_id] = $rest_id;
        }
    }
}

 

Although I can think of several ways to handle this based upon how you need the functionality to work.

[zang8027]

they CAN add other products from diff restaurants but I dont want them to