if ($wp_query->current_post +1 == $wp_query->post_count) {
    // this is the last post
}

我给你编了一个简短的例子。应该解释如何在WP循环中获取第一个和最后一个帖子。

    $post_count = 0;
    $total = count($posts);

    while (have_posts()) : the_post();

        if ($post_count == 1 AND $post_count !== $total)
        {
            // This is the first post
        }

        if ($post_count == $total)
        {
            // This is the last item
        }

        $post_count++;

    endwhile;

if (!get_next_post_link()) { 
    echo \'the last post here\'; 
}

if (!get_previous_post_link()) { 
    echo \'the last post here\'; 
}

OR

if (get_next_post_link()) { 
    echo \'the last post here\'; 
}