Snippets: Related Items for Custom Post Type

// There isn't any built-in function for related items but you can easily add your own section with some code like this
// IMPORTANT => change "book" to your post type name
// IMPORTANT => change myprefix to your custom prefix for styling purposes
// IMPORTANT => this will add related to the bottom of your post
// if you don't want it there you can change the order of your "blocks" array or you can instead
// hook the output into a different theme hook http://wpexplorer-themes.com/total/docs/action-hooks/
add_filter( 'wpex_book_single_blocks', function( $blocks ) {
    $blocks['related'] = function() {

    	// Query posts
        $related = new WP_Query( array(
            'post_type'      => 'book',
            'posts_per_page' => 3,
            'no_found_rows'  => true,
            'post__not_in'   => array( get_the_ID() ),
        ) );

    	if ( $related->have_posts() ) : ?>

	        <div class="myprefix-related-posts wpex-row clr">

				<?php
				// Columns number
				$columns = 3;
				
				// Define counter variable
				$count = 0;

				// Your loop
				while ( $related->have_posts() ) : $related->the_post();

					// Add to counter
					$count++; ?>

						<div class="myprefix-related-entry col span_1_of_<?php echo $columns; ?> col-<?php echo $count; ?> clr">
							<a href="<?php wpex_permalink(); ?>" title="<?php wpex_esc_title(); ?>">
								<?php wpex_post_thumbnail( array(
									'width'  => 500,
									'height' => 300,
								) ); ?>
							</a>
							<h2><a href="<?php wpex_permalink(); ?>" title="<?php wpex_esc_title(); ?>"><?php the_title(); ?></a></h2>
							<?php wpex_excerpt( array(
								'length' => 20,
							) ); ?>
						</div>

					<?php
					// Reset counter
					if ( $count == $columns ) {
						$count = 0;
					}

				endwhile; ?>

			</div>

		<?php endif; wp_reset_postdata(); ?>

    <?php };
    return $blocks;
}, 40 );