Changing case function

[slaterino]

Hi!
This is my first post. I'm trying to help a friend out with something but have kind of stepped in to some PHP which is slightly over my head, and so wanted to ask something. I am working on code that adds an item from a catalogue to a shopping basket. At the moment when the 'add to basket' button is pressed just one item is added to the basket. However, there are a few items that have a minimum quantity of 5 and so therefore would need to start at 5 instead of 1 for quantity. I will post all the relevant code below, but I was wanting to know what would be the best way to change this, should I create a new case? Or is there another way?

This is the initial button:

<a href="basket.php?action=add&id=' . $row['Product_ID'] . '"><img height="17" width="79" border="0" src="images/addtobasket.jpg" /></a>

This is the code for the 'add' action:

switch ($action) {
	case 'add':
		if ($cart) {
			$cart .= ','.$_GET['id'];
		} else {
			$cart = $_GET['id'];
		}
}

And then this is some of the function that displays the basket:

function showCart() {
	global $db;
	$cart = $_SESSION['cart'];
	if ($cart) {
		$items = explode(',',$cart);
		$contents = array();
		foreach ($items as $item) {
			$contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
		}
		$output[] = '<form action="basket.php?action=update" method="post" id="cart">';
			$output[] = '<td><select name="qty'.$id.'" value="'.$qty.'"><option selected value="'.$multi1a.'">'.$multi1a.'</option><option value="'.$multi2a.'">'.$multi2a.'</option><option value="'.$multi3a.'">'.$multi3a.'</option></td>';
$output[] = '<div><button type="submit">Update cart</button></div>';
		$output[] = '</form>';
	}
	return join('',$output);
}

Now what I've been trying to do is change the quantity from $qty to $multi1a. $multi1a is a value that represents the minimum quantity for my items, but it seems that the way the code works is that $qty will always be to the value of 1 when the page loads. After the page loads, if I use the update function it will then update to the value of $multi1a, but not unless I do that.

Does anyone have an idea of how I could best solve this?

Thanks so much for any help you can give!!!

Russ

[sfullman]

the cart is stored as a comma,separated,list,of,ids,which,I,think,is,wierd,though,compact.. 🙂

this is a quick and dirty fix which might give you an idea or two. you need a registry of which items require which minimums

//from your code above:
switch ($action) {
	case 'add':
		if ($cart) {
			$cart .= ','.$_GET['id'];
		} else {
			$cart = $_GET['id'];
		}
}

//but you need this array:
$minimums=arrray(
17=>5,
18=>5,
19=>12 /* am making the keys up */
);

switch ($action) {
	case 'add':
		//figure out quantity from minimum array
		$qty=($minimums[$_GET['id']] ? $minimums[$_GET['id']] : 1);
		if ($cart) {
			$cart .= str_repeat(','.$_GET['id'], $qty);
		} else {
			$cart = $_GET['id'] . str_repeat($_GET['id'], $qty-1);
		}
}

your $minimums array should be in a settings page or gotten from a db and globally available to all pages

[toxic_brain]

I guess you mark the items those require minimum quantity in the product master table. So I feel it is good to decide while you show the item. Another advantage of this approach is, in future you need a minimum purchase of 10 for a particular item you could mark it in product master table and the same script work without code change.
Add a new field in the product master table named default_qty and make the default value for this field as 1 for other products and 5 for the products those require minimum quantity

Handle this quantity in basket.php

<a href="basket.php?action=add&id=' . $row['Product_ID'] . '&qty=' .  $row['default_qty']  .' "><img height="17" width="79" border="0" src="images/addtobasket.jpg" /></a>