[RESOLVED] PHP Calculation Problem - Dropped Zero

GoNorthWest

Hi,

I'm trying to do the following calculations in a php form :

$_SESSION['total_main'] = $_SESSION['base_price'] * $_POST['Servings'];
$_SESSION['total_keiki'] = $_POST['Keiki_Servings'] * $_POST['Keiki_Price'];
$_SESSION['subtotal'] = $_SESSION['total_main'] + $_SESSION['total_keiki'];
$_SESSION['tax'] = round($_SESSION['subtotal'] * 0.04167, 2);
$_SESSION['total_due'] = $_SESSION['subtotal'] + $_SESSION['tax'];

The problem I'm having is this : If the base price is, say, $5.25 each, and the person orders two, then the Subtotal should be $10.50. However, the trailing zero is being dropped, and the Subtotal is presented as $10.5. I can't round or anything, because this has to be an exact price that's used to construct the final price. I round on the tax collection, rounding up.

Anybody know why the zero is being dropped?

Thanks!

Mark

halojoy

subtotal 10.5
this is perfectly normal

But if we want a more human display with 2 decimals
we can use [man]number_format[/man]

I mean as long figures are in database or in variables
is wont hurt if value is 10.5 ... which is eactly same matematiccal as 10.50

For display in a nice way we may often want 10.50 in columns.
This will display subtotal nice (2 decimals) without changing, effect the variable value

<?php

$total = 10.5;

// display with 2 decimals:  10.50
echo number_format( $total, 2 );

exit();
echo number_format( $_SESSION['subtotal'], 2 );

?>

Weedpacket

Because 10.50 is equal to 10.5 and you're not using [man]money_format[/man].

GoNorthWest

That did it...thanks! I knew the values were equivalent, but I could not find anything in the php manual that would show me how to display them properly (I was searching on the wrong thing). Thanks for the help!

halojoy;10948591 wrote:
subtotal 10.5
this is perfectly normal

But if we want a more human display with 2 decimals
we can use [man]number_format[/man]

I mean as long figures are in database or in variables
is wont hurt if value is 10.5 ... which is eactly same matematiccal as 10.50

For display in a nice way we may often want 10.50 in columns.
This will display subtotal nice (2 decimals) without changing, effect the variable value
<?php

$total = 10.5;

// display with 2 decimals:  10.50
echo number_format( $total, 2 );

exit();
echo number_format( $_SESSION['subtotal'], 2 );

?>