classes – How can I present second most up-to-date put up in sidebar, if most up-to-date put up is open within the browser?

I’m engaged on a web-based journal in WordPress PHP. I created a customized put up kind (article) with 4 out there customized classes. Within the sidebar I wish to present the latest put up of all of the 4 classes. But when one of the current articles are literally open within the browser, I would like the sidebar to point out the second most up-to-date article within the given class to keep away from recurrence. I acquired to the purpose the place I extracted the slug from the browser url and the slug of the newest put up from the given class, however I finished there. I feel I ought to use an if assertion, however I do not fairly understand how. I respect all assist, thanks.

sidebar-right.php (this is only one question of the 4 within the sidebar, I repeat this code for all 4 classes):

    <?php

    international $put up;
    $post_slug_open = $post->post_name;

    ?>

    <div class="sidebar-preview-container">
        <?php
        // Outline our WP Question Parameters
        $the_query = new WP_Query(array(
            'post_type' => 'articles',
            'post_status' => 'publish',
            'posts_per_page' => 1,
            'orderby' => 'date',
            'order'   => 'DESC',
            'tax_query' => array(
                array(
                    'taxonomy' => 'article_category',
                    'subject' => 'slug',
                    'phrases' => 'interju',
                )
            ),
        ));
        ?>

        <?php
        // Begin our WP Question
        whereas ($the_query->have_posts()) : $the_query->the_post();
            // Show the Put up Title with Hyperlink
            $article_categories = get_the_terms(get_the_ID(), 'article_category');
            $article_title = get_field("article_title");
            $article_subtitle = get_field('article_subtitle');
            $article_preview_image = get_field('article_preview_image');
            $article_slug = get_post_field('post_name', get_post());

            setup_postdata($put up);
            ?>

            <div class="sidebar-article-preview">
                <?php
                    if ($article_categories) :
                        foreach ($article_categories as $article_category) :
                            ?>
                        <a href="<?php echo get_stylesheet_directory_uri(); ?>/<?php echo $article_category->slug; ?>">
                            <h6 class="article-category-preview">
                                <?php echo $article_category->identify; ?>
                                <?php echo  $article_slug; ?>
                            </h6>
                        </a>
                <?php
                        endforeach;
                    endif;
                    ?>

                <a href="<?php the_permalink() ?>">
                    <h4 class="article-title-preview">
                        <?php the_title(); ?>
                    </h4>
                </a>

                <p class="article-subtitle-preview">
                    <?php echo $article_subtitle; ?>
                </p>

                <a href="<?php echo get_permalink(); ?>">
                    <img class="article-preview-img" src="<?php echo $article_preview_image['url']; ?>" alt="<?php echo $article_preview_image['alt']; ?>">
                </a>
            </div>
````````````````