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Editorial Team
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Asked: 2026-06-07T20:00:05+00:00

This is my code that I am using to try and calculate the sum

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This is my code that I am using to try and calculate the sum of “amountReceived” column. The total for invID ’95’ should = 312, but for some reason it is only = 300. I am not sure what the issue is. (please see the DB images below). 

$sql = mysql_query("SELECT amountReceived FROM payments WHERE invID='".$id."'");
$result = mysql_fetch_array($sql);
$totalPayment = array_sum($result);
$balanceDue = $invoiceTotal - $totalPayment;

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1 Answer

  1. Editorial Team

    well the mysql_fetch_array($sql) returns an array containing all “columns” of one row you fetched, means you get an e.g. array(‘amountReceived’=>150)

    this should work:

    $sql = mysql_query("SELECT amountReceived FROM payments WHERE invID='".$id."'");
$totalPayment = 0;
while($result = mysql_fetch_array($sql)) {
    $totalPayment += $result['amountReceived'];
}
$balanceDue = $invoiceTotal - $totalPayment;

    this is just a php side description of the problem, if you want to be more efficient, use sel‘s version 😉

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