Can we count the Wordpress Loop

Question

Can we count the WordPress loop and store it in a variable?

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
    <?php $post_id = get_the_ID(); ?>
    <?php get_template_part('content','home'); ?>
       some code to be executed
<?php endwhile; ?>
<?php endif; ?>

what I want is that for every 5 posts fetched ceratin code should be executed(example newsletter) → That means within the loop for every 5h, 10th, 15th, ____________ infinite posts(5n, n>=1) the code should be executed.

Answer 1

$wp_query->current_post is the build-in loop counter, starting with 0 zero for the first post in the loop.

so the line some code to be executed could translate to:

<?php if( $wp_query->current_post > 0 && $wp_query->current_post % 5 == 0 ) { ?> some code to be executed <?php } ?>

Answer 2

PLease check this code snippet

 <?php  $i=0; 
if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

    <?php $post_id = get_the_ID(); ?>
    if($i%5 == 0)
    {\\code to be executed}
    <?php get_template_part('content','home'); ?>
       some code to be executed
<?php $i++;endwhile;  ?>
<?php endif; ?>