archive.php loop

<?php define( 'WP_USE_THEMES', false ); get_header(); ?>

<?php if ( have_posts() ) : ?>
    <main>
        <div class="archive">
            <div class="col-03">&nbsp;</div>
            <div class="col-09">
                <h2>
                    <?php
                        if( is_category() ) {
                            single_cat_title();  // This echos out the categoy name
                        } elseif ( is_tag() ) {
                            single_tag_title();  // This echos out the tag name
                        } elseif ( is_author() ) {
                            the_post(); echo "Posts by " . get_the_author(); rewind_posts();  // This echos out the author name
                        } elseif ( is_day() ) {
                            echo "Daily Archives: " . get_the_date();  // This echos out the day
                        } elseif ( is_month() ) {
                            echo "Monthly Archives: " . get_the_date('F Y');  // This echos out the month and year
                        } elseif ( is_year() ) {
                            echo "Yearly Archives: " . get_the_date('Y');  // This echos out the year
                        }
                        else { echo "Archives"; }
                    ?>
                </h2>
                <p>
                    These are the posts filed under the <?php single_cat_title(); ?> category. You will not be able
                    to identify the post content other than the photograph that associates with the post. I've
                    decided that adding text to each photo would just be too much.
                </p>
            </div>
<?php while ( have_posts() ) : the_post(); ?>
            <div class="archive-gallery">
                <?php if ( has_post_thumbnail() ) : ?>
                    <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" ><?php the_post_thumbnail(); ?></a>
                <?php endif; ?>
            </div>
<?php
    endwhile; ?>
        </div>
    </main>

        <?php else :

            esc_html_e( "Sorry. No posts match your criteria." );

    endif; get_footer();
?>