使用中的链接iguanarama\'s 回答，您的更新代码是：

<?php if (has_term( \'type-1\', \'projecttype\' ) ) { ?>
<div class="holder">
    <?php if ( have_posts() ) : ?>
    <div class="container-fluid">
        <div class="project-paginat">
            <?php if(get_post_meta($post->ID, "_type", true)){ ?>
                <ul class="list-inline">
                    <li><a href="<?php echo get_home_url(); ?>/our-work">Back to Our Work</a></li>
                    <li>>> &nbsp;<?php echo get_post_meta($post->ID, "_type", true); ?></li>
                    <li>
                    <?php
                        if( get_adjacent_post(false, \'\', true) ) {
                            previous_post_link(\'%link\', \'&lt; Previous Project\', true, \'\', \'projectcategory\');
                        } else {
                            $args = array(
                                \'posts_per_page\' => 1,
                                \'order\'          => \'DESC\',
                                \'category_name\'  => \'projectcategory\',
                            );
                            $first = new WP_Query( $args ); $first->the_post();
                            echo \'<a href="\' . get_permalink() . \'">&lt; Previous Project</a>\';
                            wp_reset_query();
                        };

                    ?>
                    </li>
                    <li>
                    <?php
                        if( get_adjacent_post(false, \'\', false) ) {
                            next_post_link(\'%link\', \'Next Project &gt;\', true, \'\', \'projectcategory\');
                        } else {
                            $args = array(
                                \'posts_per_page\' => 1,
                                \'order\'          => \'ASC\',
                                \'category_name\'  => \'projectcategory\',
                            );
                            $last = new WP_Query( $args ); $last->the_post();
                            echo \'<a href="\' . get_permalink() . \'">Next Project &gt;</a>\';
                            wp_reset_query();
                        };

                    ?>
                    </li>
                </ul>
            <?php } else {
                echo \'<p>There Is No Project Type To Display.</p>\';
            } ?>
        </div>

您可以使用get\\u nextigation\\u post，请参见下面的工作示例。

     <?php
        /**
         *  Infinite next and previous post looping in WordPress
         */
        if( get_adjacent_post(false, \'\', true) ) {
            previous_post_link(\'%link\', \'&larr; Previous Post\');
        } else {
            $first = new WP_Query(\'posts_per_page=1&order=DESC\'); $first->the_post();
                echo \'<a href="\' . get_permalink() . \'">&larr; Previous Post</a>\';
            wp_reset_query();
        };

        if( get_adjacent_post(false, \'\', false) ) {
            next_post_link(\'%link\', \'Next Post &rarr;\');
        } else {
            $last = new WP_Query(\'posts_per_page=1&order=ASC\'); $last->the_post();
                echo \'<a href="\' . get_permalink() . \'">Next Post &rarr;</a>\';
            wp_reset_query();
        };

    ?>