Adding a row div after every four post in wordpress - php

Question

I am trying to add a div class="row" after every four posts in my wordpress website. The following code is used to generate the post types on my page:
<?php
$temp = $wp_query;
$wp_query = null;
$wp_query = new WP_Query();
$wp_query->query('showposts=8&post_type=branding'.'&paged='.$paged);
while ($wp_query->have_posts()) : $wp_query->the_post();
?>
<div class="col-md-3">
<div class="featured-project-image">
<?php
if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
the_post_thumbnail();
}
else { echo'<img src="';
echo get_bloginfo( 'stylesheet_directory' );
echo'/images/placeholder.jpg"/>'; } ?>
</div>
</div>
<?php endwhile;?>

Answer 1

The following should do what you want
<?php
$temp = $wp_query;
$wp_query = null;
$wp_query = new WP_Query();
$wp_query->query('showposts=8&post_type=branding' . '&paged=' . $paged);
?>
<div class="row">
<?php
$i = 0;
while ($wp_query->have_posts()):
$wp_query->the_post();
if ($i == 4) {
$i = 0;
?>
</div>
<div class="row">
<?php
}
?>
<div class="col-md-3">
<div class="featured-project-image">
<?php
if (has_post_thumbnail()) {
// check if the post has a Post Thumbnail assigned to it.
the_post_thumbnail();
}
else {
echo '<img src="';
echo get_bloginfo('stylesheet_directory');
echo '/images/placeholder.jpg"/>';
} ?>
</div>
</div>
<?php
$i++;
endwhile; ?>
</div>
Starting the div before the while loop ensures the first 4 are also contained in a row.

Answer 2

Create variable, iterate it in each loop step and check if % 4 == 0;:
$i = 0;
while (...) {
echo $i % 4 == 0 ? 'row' : ''; // echo .row in first step too. If you want in the 4th step, just change the result of modulo operator
// your code here
$i++;
}