Random Posts Shortcode

<?php
add_shortcode( 'scseed_random_posts', 'scseed_random_posts_shortcode' );
if ( ! function_exists( 'scseed_random_posts_shortcode' ) ) {
    function scseed_random_posts_shortcode( $atts ) {
        $atts = shortcode_atts( [
            'count'      => 5,
            'post_type'  => 'post',
            'show_thumb' => false,
        ], $atts, 'scseed_random_posts' );

        $query = new WP_Query( [
            'post_type'      => sanitize_key( $atts['post_type'] ),
            'posts_per_page' => absint( $atts['count'] ),
            'orderby'        => 'rand',
            'post_status'    => 'publish',
            'no_found_rows'  => true,
        ] );

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

        $out = '<ul class="scseed-random-posts">';
        while ( $query->have_posts() ) {
            $query->the_post();
            $out .= '<li class="scseed-random-posts__item">';
            if ( filter_var( $atts['show_thumb'], FILTER_VALIDATE_BOOLEAN ) && has_post_thumbnail() ) {
                $out .= '<a href="' . esc_url( get_permalink() ) . '">'
                    . get_the_post_thumbnail( null, 'thumbnail' ) . '</a> ';
            }
            $out .= '<a href="' . esc_url( get_permalink() ) . '">'
                . esc_html( get_the_title() ) . '</a>';
            $out .= '</li>';
        }
        $out .= '</ul>';
        wp_reset_postdata();
        return $out;
    }
}