我在存档页上遇到了一个特殊的问题。这个特定页面应该列出属于某个类别的所有帖子，但可以通过第二个（自定义）分类法进行过滤：即：同时属于“新闻”和“娱乐”的帖子（后者属于“主题”分类法）。

问题是，如果没有属于这两个分类术语的帖子，则不应该出现过滤器链接，但到目前为止，我还无法删除“空”链接，因为查询被主链接覆盖——下面是一些代码来解释：

if ( is_single() ) {
    $cats =  get_the_category();
    $cat = $cats[0];
} else {
    $cat = get_category( get_query_var( \'cat\' ) );
}

$topics = get_terms( array(
        \'taxonomy\' => \'topic\',
        \'hide_empty\' => true, // thought this would do the trick, but no.
) );

$topic_query_args = array(
    \'post_type\' => \'post\',
    \'post_status\' => \'publish\',
    \'posts_per_page\' => -1,
    \'nopaging\' => true,
);

foreach( $topics as $topic ):
    // This could get really slow. Refactor when able.
    $topic_tax_query = array(
        \'relation\' => \'AND\',
        array(
            \'taxonomy\' => \'category\',
            \'field\' => \'slug\',
            \'terms\' => $cat->slug
        ),
        array(
            \'taxonomy\' => \'topic\',
            \'field\' => \'slug\',
            \'terms\' => $topic->slug
        )
    );

    // Reassign the tax_query for the new $topic->slug:
    $topic_query_args[\'tax_query\'] = $topic_tax_query;
    // Run secondary query:
    $topic_query = new WP_Query( $topic_query_args );
    $found_posts = $topic_query->found_posts;
    echo \'<!--\'. print_r( $topic_query, true ) .\'-->\'.PHP_EOL;
    // wp_reset_postdata(); // Probably not needed, as I\'m not running $topic_query->the_post()

    // Here\'s the problem -- secondary query returns the same number of posts for all secondary terms:
    echo \'<!--Found posts for \'. $topic->slug .\': \'. $found_posts .\'-->\'. PHP_EOL;

    if ( $topic_query->found_posts == 0 ) {
        // Skip printing the link:
        continue;
    } else {
        // Process and print the link here.
        // ...extra code goes here...
    }
endforeach; 

如果我在没有过滤器的情况下运行此程序（例如：example.com/category/news），它会按预期工作，空的过滤器链接不会出现。但是，一旦单击其中一个链接（结果是example.com/category/news/？topic=entertainment），我将再次获得所有筛选链接，“print\\r（$topic\\u query，true）”将返回主查询变量和tax\\u查询，而不是次查询。

我为冗长的解释道歉，但我已经做了一段时间了，现在什么也没想到。有什么想法吗？

$topic_query[\'tax_query\'] = $topic_tax_query;

$topic_query_args[\'tax_query\'] = $topic_tax_query;