a single php while one three different classes [closed] - php

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I have main div with three different classes: CLASS1; ClASS2 AND CLASS3. Now I want to use a single while loop in all classes to get three images from database and display.
First class is class1 then two div have same class class2 and then last div has class3. How to do it through loop, please help, Thanks :)
<div class="col-md-9 hidden-sm hidden-xs">
<div class="col-md-1"></div>
<div class="col-md-2">
<div class="ad1">
<img src="" alt="">
</div>
</div>
<div class="col-md-2">
<div class="ad2">
<img src="" alt="">
</div>
</div>
<div class="col-md-2">
<div class="ad2">
<img src="" alt="">
</div>
</div>
<div class="col-md-5">
<div class="ad3">
<img src="" alt="">
</div>
</div>
</div>
<?php
$query = "SELECT * FROM headerimages limit 4";
$result = mysqli_query($con, $query) or die(mysqli_error($query));
while ($row = mysqli_fetch_array($result)) { ?>

Answer 1

Answer updated to reflect changes in the Question
I can see roughly what you are trying to achieve, hope this helps you...
<div class="col-md-9 hidden-sm hidden-xs">
<div class="col-md-1"></div>
<?php
$query = "SELECT * FROM headerimages limit 4";
$result = mysqli_query($con, $query) or die(mysqli_error($query));
$class_number = 1;
$class_two_repeated = FALSE;
while ($row = mysqli_fetch_array($result)):
// This bit ensures the 2nd & 3rd divs have class 'ad2'
if ($class_number == 3 && !$class_two_repeated) {
$class_two_repeated = TRUE;
$class_number--;
}
?>
<div class="col-md-<?= $class_number == 3 ? 5 : 2 ?>">
<div class="ad<?= $class_number++ ?>">
<img src="/path/to/<?= $row['whatever_the_image_field_is_named'] ?>" alt="">
</div>
</div>
<?php
endwhile;
?>
</div>