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PHP CURRENCY CALCULATIONS

socross
socross asked
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Last Modified: 2008-01-09
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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Commented:
can you post your code here ?

Author

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

Commented:
well u can request to delete this Q and refund points
Closed, 500 points refunded.
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