php , the first row is zero in column calculation

Question:

Tag: php

I have a sketch of calculation like this

``````+------------+---------------+-------------+-------------+
Name          IN              OUT          SALDO
+------------+---------------+-------------+-------------+
Cash 8%        \$50              -            \$50
Cash 4%        \$20              -            \$70
Cash 12%       \$70              -            \$140
Claimed         -              \$60           \$80
Claimed         -              \$20           \$60
+------------------------------------------+-------------+
TOTAL SALDO                      \$60
+------------------------------------------+-------------+
``````

The table above is what I am expecting to have. However this is the result what I got for now:

``````+------------+---------------+-------------+-------------+
Name          IN              OUT          SALDO
+------------+---------------+-------------+-------------+
Cash 8%        \$50              -            0
Cash 4%        \$20              -            \$50
Cash 12%       \$70              -            \$70
Claimed         -              \$60           \$140
Claimed         -              \$20           \$80
+------------------------------------------+-------------+
TOTAL SALDO                      \$60
+------------------------------------------+-------------+
``````

The problem is it give the 0 saldo in the first row even though the calculation is correct.

Here is my full code

``````    if (\$saldo->num_rows > 0) {

while(\$objek = \$saldo->fetch_object()) {
\$i++;
if (\$objek->eight_percent)
{
\$sourceCash = \$totalTwelve + \$totalEight + \$totalFour + \$totalTwo - \$totalClaim - \$totalCashout;
\$totalEight = \$totalEight + \$objek->eight_percent;
echo "<tr>
<td>Cashback 8%</td>
<td> - </td>
<td>".\$sourceCash."</td>
</tr>";
}
``````

Thanks in advance for the help.

You're using a variable before you calculate its value.

For example, lets look at these two lines:

``````\$sourceCash = \$totalTwelve + \$totalEight + \$totalFour + \$totalTwo - \$totalClaim - \$totalCashout;
\$totalEight = \$totalEight + \$objek->eight_percent;
``````

You're using the value of `\$totalEight` to calculate `\$sourceCash`, then you update the value of `\$totalEight`. On the first iteration, the value of all of those columns will be zero, which is why you're displaying zero.

You probably meant to reverse the order of those two lines.

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