动态更改div的CSS属性类php

Question

After viewing 4 data I want to change a div's class. Suppose when it is 4 data the div will be after 4 data the div will be dynamically.

<div class="carousel-inner" role="listbox">
<?php 
    $i=0;
    $sql = mysqli_query($con,"SELECT * FROM product WHERE featured = 'featured' ORDER BY id DESC");
        while($row = mysqli_fetch_assoc($sql)){
        if($i == 4){ echo '<div class="item active">';}
        elseif($i != 4){ echo '<div class="item">'; }
?>
     <div class="single-wid-product sel-pd">
        <img src="admin/upload/<?php echo $row['file']; ?>" alt="" class="product-thumb">
     </div>

    </div>
    <?php $i++; } ?>

</div>

In that picture it is a carousel. It has 4 items active. And the div is

<div class="item active">
 <p>Item 1</p>
 <p>Item 2</p>
 <p>Item 3</p>
 <p>Item 4</p>
</div>

When it's doing autoplay (for the rest products) the div is

<div class="item">
 <p>Item 5</p>
 <p>Item 6</p>
 <p>Item 7</p>
 <p>Item 8</p>
</div>

And for others the div is

   <div class="item">
     <p>Item 5</p>
     <p>Item 6</p>
     <p>Item 7</p>
     <p>Item 8</p>
    </div>

So I want to make to merge all those divs. For the first 4 items the div class will be "item active" and for the rest items the class will be "item". It will be changed dynamically.

Answer 1

You can use a PHP ternary operator right on your HTML for this. You can do that in this manner:

while ($row = mysqli_fetch_assoc($sql)) {
    ?>
        <div class="item <?= ($i == 4) ? "active" : "" ?>">
            ...
        </div>
    <?php 

    $i++;
}

Note: <?= '' ?> is the same as <?php echo '' ?>