How to generate table with more than 5 conditions - php

Question

Short
Generating table with barcodes of items. Each item has exact quantity in database table. Fields in tables are limited: 65, if more then 65 then build a second table, then a third one...How to generate tables with this conditions?
Detailed
Let's say we want to generate a table with 65 available fields (5x13).
My plan is the following
User selects items' checkboxes
When user submits form, PHP gets values of checked checkboxes
PHP gets quantities of each item from database
Generating table
For ex. the quantity for item id 55 is 2 and for 56 is 4 then the table must look like that
My code looks like that (I know that it's wrong, but I can't figure out how it must be. There must be more than 5 counters: rows counter, columns counter, $_POST['id'] counter, items' quantity counter, table counter (if total sum is more than 65))
UPDATE
<?php
$items = array();
foreach ($_POST['checkbox'] as $id) {
$stmt = $db->prepare("SELECT `qt` FROM `items` WHERE `id`=?");
$stmt->bind_param('i', $id);
$stmt->execute();
$stmt->bind_result($qt);
$stmt->fetch();
$stmt->close();
for ($cnt = 1; $cnt <= $qt; $cnt++)
$items[] = $id;
}
$i = 0;
foreach ($items as $item) {
for ($j = 0; $j < $item['quantity']; $j++) {
// check if it's the beginning of a new table
if ($i % 65 == 0)
echo '<table>';
// check if it's the beginning of a new row
if ($i % 5 == 0)
echo '<tr>';
echo '<td><img src="bc.php?id=' . $item['id'] . '" alt="' . $item['name'] . '" /></td>';
// check if it's the end of a row
if (($i - 1) % 5 == 0)
echo '</tr>';
// check if it's the end of a table
if (($i - 1) % 65 == 0)
echo '</tr></table>';
$i++;
}
}
// if the last row wasn't closed, close it
if ($i % 5 != 0)
echo '</tr>';
// if the last table wasn't closed, close it
if ($i % 65 != 0)
echo '</table>';
?>
Any suggestion?

Answer 1

EDIT 4
<?php
$i = 0;
foreach ($_POST['checkbox'] as $id) {
$stmt = $db->prepare("SELECT `qt` FROM `items` WHERE `id`=?");
$stmt->bind_param('i', $id);
$stmt->execute();
$stmt->bind_result($qt);
$stmt->fetch();
$stmt->close();
for ($cnt = 1; $cnt <= $qt; $cnt++) {
// check if it's the beginning of a new table
if ($i % 65 == 0)
echo '<table>';
// check if it's the beginning of a new row
if ($i % 5 == 0)
echo '<tr>';
echo sprintf('<td><img src="bc.php?id=%1$d" alt="%1$d" /></td>', $id);
// check if it's the end of a row
if (($i + 1) % 5 == 0)
echo '</tr>';
// check if it's the end of a table
if (($i + 1) % 65 == 0)
echo '</table>';
$i++;
}
}
// if the last table isn't full, print the remaining cells
if ($i % 65 != 0) {
for ($j = $i%65; $j < 65; $j++) {
if ($j % 65 == 0) echo '<table>';
if ($j % 5 == 0) echo '<tr>';
echo '<td></td>';
if (($j + 1) % 5 == 0) echo '</tr>';
if (($j + 1) % 65 == 0) echo '</table>';
}
}

Answer 2

You need to just repeatedly make sheets of 65 cell tables until you're done.
I'm going to pseudo code:
data rows = resultOfMyQuery();
int index = 0;
while(index < rows.count()) {
index = createASheet(rows, index);
}
END;
int createASheet(data rows, int index) {
int availableCells = 65;
int column = 0;
print("<table>");
while (availableCells > 0) {
if (index < rows.count()) {
data row = rows.get(index);
int quantity = row.getQuantity();
if (quantity > availableCells) {
// Stay on this item with reduced quantity for next sheet.
row.setQuantity(quantity - availableCells);
rows.set(index, row);
} else {
// Move on to next item on this (or next) sheet.
index++;
}
for (i=0; i<quantity && availableCells>0; quantity--) {
column = makeACell(column, StringFormat("<TAG ATTRIB='%d'></TAG>",row.getId()));
availableCells--;
}
} else {
// fill in empty cells
column = makeACell(column, "");
availableCells--;
}
}
print("</table>");
return index;
}
int makeACell(int column, String filling) {
String cell = "";
if (column == 0) {
cell.append("<tr>");
}
cell.append("<td>").append(filling).append("</td>");
if (column == 4) {
cell.append("</tr>");
}
print cell;
return (column+1) % 5;
}

Answer 3

Why don't you use an existing barcode system like QR-codes? These standards offer libraries to build the codes and are readable by various devices.
If you really want to built your own barcode I strongly suggest to use the binary system to store your values. Think about check sums too.