get_item_discount (Sale_lib)

Calculates line-item discount amount from quantity, price, discount value and type (percent or fixed), returning a rounded result.

// Source: https://github.com/Pmbamungu/ospos | License: MIT | Copyright 2013-2021 jekkos
// Provided via justclaw.it.com; keep this notice with the code.
	public function get_item_discount($quantity, $price, $discount, $discount_type)
	{
		$total = bcmul($quantity, $price);
		if($discount_type == PERCENT)
		{
			$discount = bcmul($total, bcdiv($discount, 100));
		}
		else
		{
			$discount = bcmul($quantity, $discount);
		}

		return round($discount, totals_decimals(), PHP_ROUND_HALF_UP);
	}