如何转到其他帖子与下一篇文章，但停留在同一类别。我使用公文包插件wordpress

function custom_previous_next_post_links($format, $link, $post, $adjacent){
    $taxonomy = 'category'; // 设置为你希望使用的分类法名称
    $term_list = get_the_terms($post->ID, $taxonomy);
    $term_slug = $term_list[0]->slug; // 获取当前文章的分类法别名

    $previous = '« 上一篇';
    $next = '下一篇 »';

    $previous_post = get_previous_post(true, '', $taxonomy);
    $next_post = get_next_post(true, '', $taxonomy);

    if ($adjacent) {
        $post = $previous_post;
        $link_text = $previous;
    } else {
        $post = $next_post;
        $link_text = $next;
    }

    if ($post) {
        $permalink = get_permalink($post->ID);
        $title = get_the_title($post->ID);
        $link = '<a href="' . $permalink . '">' . $title . '</a>';
        $format = str_replace('%link', $link, $format);
        $format = str_replace('%title', $title, $format);
        $format = str_replace('%date', mysql2date(get_option('date_format'), $post->post_date), $format);
        $format = str_replace('%previous', $previous, $format);
        $format = str_replace('%next', $next, $format);
    } else {
        $format = '';
    }

    return $format;
}

// 用于上一篇文章导航
function custom_previous_post_link($format='&laquo; %link', $link='%title', $in_same_term = false, $taxonomy = 'category'){
    return custom_previous_next_post_links($format, $link, $post, true);
}

// 用于下一篇文章导航
function custom_next_post_link($format='%link &raquo;', $link='%title', $in_same_term = false, $taxonomy = 'category'){
    return custom_previous_next_post_links($format, $link, $post, false);
}

<?php
    // 上一篇文章导航链接
    echo custom_previous_post_link();

    // 下一篇文章导航链接
    echo custom_next_post_link();
?>