Dynamic Rule Names and Values

OK, I have been mulling this one over for quite a while now. I'll get straight to it.

Here's my rule in the cart file...

//eCart Rule
function WAEC_theCart_TotalUnitThresholdDiscount() {
$totalDiscount = 0;
if (true && (($this->InCart("".(isset($_SESSION['item_3128'])) ? $_SESSION['item_3128'] : '' ."") == true))) {
$totalDiscount += floatVal("".(isset($_SESSION['totaldiscountfor_3128'])) ? $_SESSION['totaldiscountfor_3128'] : '' ."");//Result
}
return WA_eCart_FormatNumber($totalDiscount, $this->ForceDecimalsC, $this->DecimalPlacesC);
}
//eCart Rule

You'll notice in there that there are TWO SESSIONS where their names end '_3128'

Now, my question is this...

How do (or can!?) I make "_3128" dynamic in this rule so that it looks something more like this $_SESSION['totaldiscountfor_DYNAMIC']

That which I wish to do is make the _DYNAMIC part reference the actual ID of the product being passed to the cart, for example, I would love to be able to do this $_SESSION['totaldiscountfor_.$this->ID)']

Would (should) that work, I did try that but it will not...is there a way to do this?

Regards
Andrew

PS: Please assume I have done all the other configurations, including setting the value of said variable...which I definitely have done :-)

It's not going to work that way.

The rule is executed once and not once per row, so you can't reference a row in it.

The solution is probably to hand code your discount calculation on your cart page. Manually create a loop that loops through the recordset and finds the discount amount, then stores it as a Session variable on the cart page.

Then the rule becomes simplified to just do a flat rate charge of the Session variable value when the Session variable exists and all of the complex rule calculations are handled by the code you write on top of the cart.php page.

This is something we could help with in a premier support ticket.