related posts / tri.be calendar events

function rm_related_posts($post_id) {

    $tags = wp_get_post_tags($post_id);

    if (!$tags)
        return false;

    // creo un array con i tag di questo articolo
    $tag_ids = array();
    foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;

    $args_related =array(
        'post_type' => 'post',
        'tag__in' => $tag_ids,
        'post__not_in' => array($post_id),
        'posts_per_page'=> 6, // Number of related posts to display.
    );

    $rm_related = new WP_Query($args_related);

//    echo '<pre>';
//    print_r($rm_related);
//    echo '</pre>';

    if ($rm_related->have_posts()) {

        // mostro titoletto
        ?>

        <div class="row row-related-posts">
            <div class="col-md-12">
                <h3><?php _e('Ti potrebbe interessare'); ?></h3>
            </div>
        </div>

        <?php

        $i=0;

        while ($rm_related->have_posts()) : $rm_related->the_post();

            if ($i==0)
                echo '<div class="row">';

            ?>

            <div class="col-md-4">
                <a rel="external" href="<? the_permalink()?>"><?php rm_post_thumbnail(); ?></a>
                <h2><a rel="external" href="<? the_permalink()?>"><?php the_title(); ?></a></h2>
            </div>

            <?php

            if ($i<2) {
                $i++;
            } else {
                // è il post "dispari"
                $i=0;
                echo '</div>';
            }

        endwhile;

        // fix
        // chiudo div eventualmente lasciato aperto...
        if ($i==1)
            echo '</div>';

    }

    wp_reset_postdata();

}