Solved

PHP calculate tax function

Posted on 2009-05-05
6
958 Views
Last Modified: 2012-05-06
Hi,

I have been having trouble writing a PHP function to calculate tax on an amount using an if statement.

My variables come into my page in this format. I cannot modify this and my final total must have the variable name paymentAmount

<?=$_REQUEST['SHIPPINGAMT']?>
<?=$_REQUEST['paymentAmount']?>
<?=$resArray['SHIPTOSTATE'] ?>

The following pseudo code explains what I am trying to accomplish, but cant get the syntax correct.

If SHIPTOSTATE is equal to CA then

Subtact SHIPPINGAMT from paymentAmount multiply that total by 0.095 then add SHIPPINGAMT back to that total

0
Comment
Question by:jackie777
  • 3
  • 2
6 Comments
 
LVL 5

Expert Comment

by:cdaugustin
ID: 24310222
hi
check the atached code, i didnt understand what CA means so replace it with the apropriate value/variable.
if ($resArray['SHIPTOSTATE'] == CA)
{
	$_REQUEST['paymentAmount'] = ($_REQUEST['paymentAmount'] - $_REQUEST['SHIPPINGAMT']) * 0.095 + $_REQUEST['SHIPPINGAMT'];
	
	
}

Open in new window

0
 
LVL 5

Expert Comment

by:cdaugustin
ID: 24310232
note that the only variable that gets modified is $_REQUEST['paymentAmount'] . the pseudocode was a bit unclear to me, hopefully its what you want
0
 

Author Comment

by:jackie777
ID: 24310327
Thanks cdaugustin

You gave me exactly what i asked for, the only problem was what I asked for was incorrect. I needed to calculate the tax on the amount then add it to the amount. I re-wrote what you gave me below and it seems to be working how I need it. I am pretty weak on php syntax, perhaps you gan give my code a look thought to see if you think it is correct.
$caltax = ($_REQUEST['paymentAmount'] - $_REQUEST['SHIPPINGAMT']) * 0.095;
 
if ($resArray['SHIPTOSTATE'] == CA)
{
$_REQUEST['paymentAmount'] = ($_REQUEST['paymentAmount'] + $caltax);               
}

Open in new window

0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 
LVL 17

Expert Comment

by:nplib
ID: 24310330
You don't need to add them first, do the tax then add them
function getTax($payment, $shipping, $state) {
  switch ($state)
  {
    case "CA": $tax_percentage = 0.095; break;
    // ADD MORE CASES FOR EACH STATE HERE
  }
  $tax = ($payment * $tax_percentage);
 
  return ($payment + $shipping + $tax);
}
 
 
echo getTax($_REQUEST['paymentAmount'], $_REQIEST['paymenyAmount'], resArray['SHIPTOSTATE']);

Open in new window

0
 
LVL 5

Accepted Solution

by:
cdaugustin earned 500 total points
ID: 24310428
hi,

im glad I could help. The only thing that you need to "fix" on your code would be

if ($resArray['SHIPTOSTATE'] == CA)


in this case if CA is not a defined constant then replace it with 'CA' to make the comparison clear (if you leave it like this it will work, but it will output an constant undefined warning and will do a implicit conversion to string, which you probably wont be aware of -- best to have the syntax clear)
0
 

Author Closing Comment

by:jackie777
ID: 31578278
Thanks!
0

Featured Post

Space-Age Communications Transitions to DevOps

ViaSat, a global provider of satellite and wireless communications, securely connects businesses, governments, and organizations to the Internet. Learn how ViaSat’s Network Solutions Engineer, drove the transition from a traditional network support to a DevOps-centric model.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Foreword (July, 2015) Since I first wrote this article, years ago, a great many more people have begun using the internet.  They are coming online from every part of the globe, learning, reading, shopping and spending money at an ever-increasing ra…
This article will show, step by step, how to integrate R code into a R Sweave document
Learn the basics of modules and packages in Python. Every Python file is a module, ending in the suffix: .py: Modules are a collection of functions and variables.: Packages are a collection of modules.: Module functions and variables are accessed us…
The viewer will learn how to count occurrences of each item in an array.

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question