function tc_cart_discount_value_total() { global $discount_value_total; if (!isset($_SESSION)) { session_start(); } $total = $_SESSION['tc_cart_subtotal']; $_SESSION['discount_value_total'] = TC_Discounts::max_discount(tc_minimum_total($discount_value_total), $total); return TC_Discounts::max_discount($discount_value_total, $total); }