While loop with an exception after a count is reached

Question

I'm trying to edit the tag.php page so that it displays all tagged posts (as it normally does) 'but' I want to call a function after the 3rd post in the loop.

Current Code

<?php /* The loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
    <?php get_template_part( 'content', get_post_format() ); ?>
<?php endwhile; ?>

Any suggestions on how to insert the following function after the 3rd post in the loop?

<?php echo someFunction() ?>

Answer 1

You can make use of the build in loop counter, $current_post which you can access in the main query with $wp_query->current_post. (Just a note, the counter starts at 0, so post 1 will be 0)

The main query uses WP_Query, $wp_query being the query variable used, so have a look at the Methods and Properties which you can make use of and the uses of these Methods and Properties

Inside your loop, just before endwhile, add the following

if( 2 === $wp_query->current_post ) {
    echo someFunction();
}