RE: [PHP-DB] wierd math problem

I don't see a return $reduceBy; in the function getDiscount > -----Original Message----- > From: mark hurty [mailto:hurty@mac.com] > Sent: Tuesday, May 13, 2003 12:58 PM > To: php-db@lists.php.net > Subject: [PHP-DB] wierd math problem > > > It could be that I was just up too late and I'm not seeing something > really obvious, but I having a weird math problem. in my > script I have > a function which calculates a discount for the purchase of > tickets to a > chamber music festival. Here's the function which performs as > expected: > > > // if the patron orders tickets for 4 main events > > // he/she receives a 10% discount on those events > > > > function getDiscount() > > { > > $discResult = mysql_query ("select * from cart > > inner join items > > on cart.itemId = items.itemId > > where cart.cookieId = '" . GetCartId() . "' > > and items.itemDisc <> 'xx' > > group by items.itemDisc"); > > $disCount = mysql_num_rows ( $discResult ); > > > > if ($disCount >= 4) { > > > > $discPrices = mysql_query ("select * from cart > > inner join items > > on > cart.itemId = items.itemId > > where > cart.cookieId = '" . > > GetCartId() . "' > > and > items.itemDisc <> 'xx'"); > > while ($row = > mysql_fetch_array($discPrices)) > > $reduceBy += > (($row["qty"] * $row["itemPrice"]) * 0.1); > > echo number_format($reduceBy, 2); > > > > } > > > > else { > > $reduceBy = 0; > > echo number_format($reduceBy, 2); > > } > > } > > When I call the function on the page to show the discount, everything > is ok: > > > Subscriber Discount: $<?php echo getDiscount(); ?> > > This displays "Subscriber Discount: $85.40" > > I have a variable ($totalCost) which tallies the non-discounted total > cost for all the tickets purchased. ($totalCost += ($row["qty"] * > $row["itemPrice"]);) which works fine. I call that variable > on the page > like this: > > > Order Subtotal: $<?php echo number_format(($totalCost), 2); ?> > > Which displays "Order Subtotal: $854.00" > > Now here's the part that is screwy. When I try and calculate the > discounted total price, using this: > > > $myPrice = $totalCost-getDiscount(); > > echo ($myPrice); > > I get "8.54854" which is simply the result of the function > getDiscount > followed by the variable $totalCost. > Of course I expected to get the result of the equation "854 - 85.40" > or "768.60" > > What am I doing wrong? > > Mark > > -- > mark hurty | mark@hurty.com | 309.764.0911 > > > -- > PHP Database Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >