Question

PHP CURRENCY CALCULATIONS

Asked by: socross

Hi

I have a database table which stores items for an invoice, there are 4 cols (where item_net is a float (4,2) and stores the amount before tax and item_vat is a true or false (1 or 0) which identifys whether vat is required on that item.

invoice_id     |    item_details     |        item_net       |      item_vat


When i pull out all items related to an invoice (invoice_id) i need to do some calculations to pull out three results.

1. total net ($net)
2. total vat ($vat)
3 Total ($net +$vat)

So i need to take each row of the $item array that i create when i pull all the values out of the database and then for each row calculate the vat if required and then add to the running total.

I have tried creating some empty vars for the net and the vat and then adding to them but i cant seem to get it working, could this be something to do with the float format in the db.

Any suggestions, example code would be much appriciated, i can post my current attempt, but i would rather see how a pro would approach it first.

Many thanks

--s--

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Asked On
2007-10-09 at 07:58:55ID22881532
Tags

php

,

currency

,

float

,

vat

Topics

PHP Scripting Language

,

MySQL Server

Participating Experts
3
Points
0
Comments
7

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Answers

 

by: gawaiPosted on 2007-10-09 at 08:33:38ID: 20041815

can you post your code here ?

 

by: socrossPosted on 2007-10-09 at 08:43:07ID: 20041918

                       //EMPTY TOTAL VALUE
                        $net = '';
                        $vat = '';                        
                        
                        //GET TOTALS
                        if(!empty($items)) {                              
                              foreach($items as $row){
                                                      
                                    $net = $net + $row['item_net'];
                                    
                                    if($row['item_vat'] == 1)
                                          $vat = $vat + ($row['item_net'] * '0.175');
                                    
                              }      
                                    
                              $total = $net + $vat;      
                        }
                        else
                              $net = $vat = $total = 'n/a';

 

by: socrossPosted on 2007-10-09 at 09:36:09ID: 20042352

Managed to get it working,

It was my database format all along, needed to store the net value as FLOAT(8,2) and then used the number_format php function to reformat the values after calculations

                        
                        //CALCULATE INVOICE TOTALS HERE
                        
                        //EMPTY TOTAL VALUE
                        $net = '';
                        $vat = '';                        

                        if(!empty($items)) {                              
                              foreach($items as $row2){
                                                      
                                    $net = $net + $row2['item_net'];
                                    
                                    if($row2['item_vat'] == 1)
                                          $vat = $vat + ($row2['item_net'] * '0.175');
                                    
                              }
                              $net = number_format($net,2);
                              $vat = number_format($vat,2);                                    
                              $total = $net + $vat;      
                        }
                        else
                              $net = $vat = $total = '0.00';


Thanks anyway!!

-s-

 

by: rmaranhaoPosted on 2007-10-09 at 14:48:57ID: 20044867

Why don't you use sum(total), sum(vat), sum(total+vat) when retrieving daa from the db?

 

by: gawaiPosted on 2007-10-10 at 11:31:20ID: 20051049

well u can request to delete this Q and refund points

 

by: Computer101Posted on 2007-11-17 at 13:19:44ID: 20305420

Closed, 500 points refunded.
Computer101
EE Admin

20120131-EE-VQP-002

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