How to add queried rows with same values? - php

Question

I am new to PHP. I have a table that stores the transactions bought. I am to summarize the transactions that happens in between two dates. For example: 2014-03-21 to 2014-03-23
I'm placing this in a fpdf :)
Here's my query:
<?php
$query = "SELECT * FROM tbl_items INNER JOIN tbl_receipts ON tbl_items.item_id=tbl_receipts.item_id WHERE receiptdate >= '$sdate' && receiptdate <='$ldate' ORDER BY tbl_items.item_id";
$result = mysql_query($query);
$row = mysql_fetch_assoc($result);
$addtotal = 0;
$counter = 1;
if (mysql_num_rows($result) != 0) {
while ($row = mysql_fetch_assoc($result)) {
$totaladd = $row['quantity_bought'] * $row['itemquantity_price'];
$item = $row['item_description'];
$num = $row['quantity_bought'];
$pdf->Cell(15, 13, '', 0, 0, 'C');
$pdf->Cell(15, 6, $counter, 1, 0, 'R');
$pdf->Cell(60, 6, $row['item_description'], 1, 0, 'L');
$pdf->Cell(20, 6, $row['quantity_bought'], 1, 0, 'R');
$pdf->Cell(30, 6, $row['itemquantity_price'], 1, 0, 'R');
$pdf->Cell(30, 6, "$totaladd.00", 1, 0, 'R');
$pdf->Ln(6);
$addtotal = $addtotal + $totaladd;
$counter++;
}
}
$pdf->Cell(15, 15, '', 0, 0, 'C');
$pdf->Cell(15, 6, '', 1, 0, 'R');
$pdf->Cell(60, 6, 'SUB-TOTAL', 1, 0, 'L');
$pdf->Cell(20, 6, '', 1, 0, 'R');
$pdf->Cell(30, 6, '', 1, 0, 'R');
$pdf->Cell(30, 6, "$addtotal.00", 1, 0, 'R');
$pdf->Ln(4);
?>
However, after summarizing, I have multiple rows for items with same item_description. I want to add those item quantities to avoid repetition. How can I do it?

Answer 1

Personally, I pass by the array, or I accumulate on the key and then I browse the array.
for example:
$array = array();
while($row = mysql_fetch_assoc($result)){
$array[$row['item_description']]['quantity_bought'] = $row['quantity_bought'];
$array[$row['item_description']]['itemquantity_price'] = $row['itemquantity_price'];
...
}
foreach($array as $item_description => $array_detail){
$item = $item_description;
foreach($array_detail as $key => $value){
if ($key == 'quantity_bought') $num = $value;
...
}
}