add_shortcode('hkk_user_post', function(){
    if (!is_user_logged_in()) {
        return '<p>Please log in to see your posts.</p>';
    }

    $current_user_id = get_current_user_id();

    $args = array(
        'author'      => $current_user_id,
        'post_type'  => 'post',
        'post_status' => 'publish'
    );

    $user_posts = get_posts($args);

    if (empty($user_posts)) {
        return '<p>You have not uploaded any posts yet.</p>';
    }

    $output = '<ul>';
    foreach ($user_posts as $post) {
        setup_postdata($post);
        $output .= '<li>';
        $output .= '<h3>' . get_the_title($post) . '</h3>';
        $output .= get_the_post_thumbnail($post, 'thumbnail');
        $output .= '<p>' . get_the_content($post) . '</p>';
        $output .= '</li>';
    }
    $output .= '</ul>';
    wp_reset_postdata();

    return $output;
});

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://hugmyplant.com/wp-sitemap-index.xsl" ?>
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