我正在使用pre_get_posts 然而，由于hook没有按预期工作，我发现函数被调用了4次，当第一个调用按预期运行时，后续调用将无法正确运行。我想知道为什么我的自定义挂钩被运行了不止一次！

我找到了一个article that explains why this may happen, 但我很困惑，因为就我而言，这根本不应该发生。。。。

代码：

function exclude_category( $query ) {
    global $acorn_user;
    $tax_query = array();

    if ( $query->is_feed ) {
        /**** Exclude "exclude" category posts from feed ********/
        $query->set(\'cat\', \'-617, -618\');
        return $query;
    }

    $args = array(
        \'category__not_in\' => 2 ,
        \'category__in\' =>  22,
        \'posts_per_page\' => 7,
        \'post_status\' => \'publish\');

    if (!is_user_logged_in()  /*&& !is_admin()*/) {
        /**** Exclude child categories ********/
        if ($query->is_category(3) || $query->is_category(68) || $query->is_category(69) || $query->is_category(70)) {
            $queried_object = get_queried_object();
            $child_cats = (array)get_term_children($queried_object->term_id, \'category\');

            if (!$query->is_admin) {
                //exclude the posts in child categories
                $tax_query[] = array(\'category__not_in\', array(68, 69, 70, 81, 82, 83));
            }
        }
    }
    //exclude search results for parents & teachers & non logged users
    if ( $query->is_search && $query->is_main_query() ) {
        if(empty($acorn_user) || !in_array( \'teacher\', (array) $acorn_user->roles )) {
            $tax_query[] = array(\'post__not_in\', array(30140, 30020, 30008, 29998, 29991, 21458,20197,11986,6614));
        }
    }
    if (!empty($tax_query)) {
        $query->set(\'tax_query\', $tax_query);
    }
    return $query;
}
add_filter( \'pre_get_posts\', \'exclude_category\' );