Recent Posts With Thumbnails Shortcode

<?php
if ( ! function_exists( 'scseed_recent_posts_thumbs_shortcode' ) ) {
    /**
     * Usage: [recent_posts_thumbs count="5" thumb_size="thumbnail" show_date="yes"]
     */
    function scseed_recent_posts_thumbs_shortcode( $atts ) {
        $atts = shortcode_atts(
            array(
                'count'      => 5,
                'thumb_size' => 'thumbnail',
                'show_date'  => 'yes',
            ),
            $atts,
            'recent_posts_thumbs'
        );

        $query = new WP_Query( array(
            'posts_per_page'      => absint( $atts['count'] ),
            'post_status'         => 'publish',
            'ignore_sticky_posts' => true,
            'no_found_rows'       => true,
        ) );

        if ( ! $query->have_posts() ) {
            return '';
        }

        $thumb_size = sanitize_key( $atts['thumb_size'] );
        $show_date  = ( 'yes' === $atts['show_date'] );

        ob_start();
        echo '<ul class="scseed-recent-posts">';
        while ( $query->have_posts() ) {
            $query->the_post();
            echo '<li class="scseed-recent-post">';
            if ( has_post_thumbnail() ) {
                echo '<a href="' . esc_url( get_permalink() ) . '" class="scseed-rp-thumb" tabindex="-1" aria-hidden="true">';
                the_post_thumbnail( $thumb_size );
                echo '</a>';
            }
            echo '<div class="scseed-rp-content">';
            echo '<a class="scseed-rp-title" href="' . esc_url( get_permalink() ) . '">' . esc_html( get_the_title() ) . '</a>';
            if ( $show_date ) {
                echo '<time class="scseed-rp-date" datetime="' . esc_attr( get_the_date( 'c' ) ) . '">' . esc_html( get_the_date() ) . '</time>';
            }
            echo '</div>';
            echo '</li>';
        }
        echo '</ul>';
        wp_reset_postdata();
        return ob_get_clean();
    }
}
add_shortcode( 'recent_posts_thumbs', 'scseed_recent_posts_thumbs_shortcode' );