why the Code Does not work - php

Question

in "$grandtotal1" and "$grandtotal2" does not display the sum
while($data=mysql_fetch_array($hasil)){
$tgl =$data['date_added'];
$jenis_pemilik=$data['pemilik'];
$no_invoice =$data['order_id'];
$pengiriman =$data['shipping_method'];
$berat =$data['weight'];
$namabarang =$data['name'];
$artikel =$data['model'];
$retails =$data['retail']*1;
$odv =$data['odv'];
$ongkir =$data['text'];
$diskon =$data['price']*1;
$harga_jual =$data['harga_jual']*1;
$stars =(($harga_jual-$odv)*80)/100*1;
$grandtotal1 +=($stars);
$divisi =(($harga_jual-$odv)*20)/100*1;
$grandtotal2 +=($divisi);
I apply this code to FPDF does not work , but I apply to html page works

Answer 1

from looking at your code - it seems you want to add 80% of an amount to $grandtotal1 and 20% to $grandtotal 2 - meaning that these are calculations and so the += is appropriate since you want to add numbers rather than concatenate values. I think the issue is that you haven't declared these values intiially so there is nothing to add them to.
before the while loop - declare the values:
$grandtotal1 = 0;
$grandtotal2 = 0;
while($data=mysql_fetch_array($hasil)){....
then when it is time, add the values
$stars =(($harga_jual-$odv)*80)/100*1;
$grandtotal1 +=($stars);
$divisi =(($harga_jual-$odv)*20)/100*1;
$grandtotal2 +=($divisi);
This will add the values of the calculations to each of the $grandTotals. not sure why you are multiplying all values by 1?