Echo something every 24th iteration - php

Question

I have just stumbled across an issue. I have been trying to make sure that whenever the id reaches a number based on 24 (24, 48, 72, etc) it would echo a certain output. Does anyone have any clue on how to do this?
Best wishes,
$mysql_connection = mysqli_query($mysqli, "SELECT * FROM data") or die(mysql_error());
while($bar_data = mysqli_fetch_assoc($mysql_connection)) { ?>
<div class="item-wrapper">
<div class="item">
<div class="brand">
<p class="brand-content"><?php echo $bar_data["brand"]; ?></p>
</div>
<div class="type">
<p class="type-content"><?php echo $bar_data["type"]; ?></p>
</div>
<div class="data">
<p class="data-content"><?php echo $bar_data["content"]; ?>, <?php echo $bar_data["color"]; ?></p>
</div>
<div class="price">
<p class="price-content"><?php echo $bar_data["price"]; ?></p>
</div>
<div class="img">
<?php
$generator = new \Picqer\Barcode\BarcodeGeneratorPNG();
echo '<img src="data:image/png;base64,' . base64_encode($generator->getBarcode($bar_data["barcode"], $generator::TYPE_CODE_128)) . '">';
?>
</div>
</div>
</div>
<?php
// When $bar_data["id"] reaches 24 based echo the following:
echo '</div><div class="page">';
}
}
?>

Answer 1

Use modulo arithmetic: http://php.net/manual/en/internals2.opcodes.mod.php
if ($bar_data['id'] % 24 == 0)
{
}
If the number you are on within your loop mod 24 == 0 then you can display the appropriate content.
The above code means that the number in $bar_data['id'] has no remainder when divided by 24. Values such as 24, 48, 72 satisfy this condition.