Total Newbie needs help

[jmalone]

The code below doesn't work. I believe the function is not executing, but I've been hunting and pecking for too long and need some input. Can anyone take time out to help with this?

Best, J.

 

 

<B>Checkout</B><br>

Below is a summary of the products you wish to purchase, along with totals:

<?php

 

#tax rate is constant

$price = 0;

$tax = 0.08;

$total_price = 0;

$total_tax = 0;

$shipping = 0;

$total_shipping = 0;

$grand_total = 0;

?><ul><?

 

function tallyTotals($grand_total) {

$total_price += $price;

$total_tax += $tax * $price;

$total_shipping += $shipping * $price;

$grand_total = ($total_price + $total_tax + $total_shipping);

}

 

$product = "Candle Holder";

$price = 11.95;

$shipping = 0; //free shipping

echo "<li>".$product.": $".$price;

 

tallyTotals($grand_total);

 

$product = "Coffee Table";

$price = 99.50;

$shipping = 0.10; //shipping as a percentage of price

echo "<li>".$product.": $".$price;

 

tallyTotals($grand_total);

 

$product = "Floor Lamp";

$price = 44.99;

$shipping = 0.10; //shipping as a percentage of price

echo "<li>".$product.": $".$price;

 

tallyTotals($grand_total);

 

?>

</ul>

<hr>

<br>

<B>Total (including tax and shipping): $<? echo number_format($grand_total, 2); ?></B>

[Jessica]

Go read the manual on variable scope. And "return". And turning on error reportingz

[jcbones]

I created a new function to try and help you understand the concept. It is fully commented. Note that I left your function and calls in the script, but commented them out. I also added error_reporting to the script as well. You should really set error reporting in you php.ini though.

 

<?php
//turn on error_reporting
error_reporting(-1);
ini_set('display_errors',1);
#tax rate is constant
$price = 0;
$tax = 0.08;
$total_price = 0;
$total_tax = 0;
$shipping = 0;
$total_shipping = 0;
$grand_total = 0;
?><ul><?php

// function tallyTotals($grand_total) {
// $total_price += $price;
// $total_tax += $tax * $price;
// $total_shipping += $shipping * $price;
// $grand_total = ($total_price + $total_tax + $total_shipping);
// }

///////////////////Any variable created in a function, is only available to that function.
//////////////////To get information out of a function, you must return the information.
function totalPrice($price, $shipping, $percentage = FALSE) { //create new function with 3 arguments, first 2 MUST be supplied, the third is optional.
if($percentage == TRUE) { //if the 3rd argument is changed to true, then run this block of code.
return $price + ($price * $shipping); //and return the price + a percentage of the price for shipping charges.
}
return $price + $shipping; //if the shipping is not a percentage, then just add it to the price, and return the result.
}

$product = "Candle Holder";
$price = 11.95;
$shipping = 0; //free shipping
echo "<li>".$product.": $".$price;

$grand_total += totalPrice($price,$shipping); //Send the arguments to the function, notice there is no 3rd argument supplied, the function will use the pre-defined FALSE.  returned data will be stored in $grand_total.
//tallyTotals($grand_total);

$product = "Coffee Table";
$price = 99.50;
$shipping = 0.10; //shipping as a percentage of price
echo "<li>".$product.": $".$price;

$grand_total += totalPrice($price,$shipping,TRUE); //Another call to totalPrice, this time with 3 arguments, since we need to change the shipping to a percentage by setting the 3rd argument to TRUE.
//tallyTotals($grand_total);

$product = "Floor Lamp";
$price = 44.99;
$shipping = 0.10; //shipping as a percentage of price
echo "<li>".$product.": $".$price;

$grand_total += totalPrice($price,$shipping,TRUE); //same as above.
//tallyTotals($grand_total);

?>
</ul>
<hr>
<br>
<B>Total (including tax and shipping): $<?php echo number_format($grand_total, 2); ?></B> 

[jmalone]

Thank you both for your help. I used jcbones code and was able to see what I was missing. I will definately read the manual ... again : ) ... to try and clear the fog. Thanks again, J.