<?php

    $categories = get_the_category();

    $categoryIDS = array();

    foreach ($categories as $category) {

    array_push($categoryIDS, $category->term_id);

    }

    $categoryIDS = implode(“,”, $categoryIDS);

    ?>

    <?php if (get_previous_post($categoryIDS)) { previous_post_link(‘上一篇: %link’,’%title’,true);} else { echo “没有了，已经是最后文章”;} ?>

    <?php if (get_next_post($categoryIDS)) { next_post_link(‘下一篇 %link’,’%title’,true);} else { echo “没有了，已经是最新文章”;} ?>