EDIT

单件。您应该使用的php：<?php previous_post_link(\'%link\', \'Previous\'); ?> 和<?php next_post_link(\'%link\', \'Next\'); ?>. 然后将其添加到函数中。php：

function filter_next_post_link($link) {
    $link = str_replace("rel=", \'class="next" rel=\', $link);
    return $link;
}
add_filter(\'next_post_link\', \'filter_next_post_link\');

function filter_previous_post_link($link) {
    $link = str_replace("rel=", \'class="prev" rel=\', $link);
    return $link;
}
add_filter(\'previous_post_link\', \'filter_previous_post_link\');

虽然这不是这个问题的答案，但要在分类中分页，您应该进行研究next_posts_link_attributes 和previous_posts_link_attributes 挂钩。只需将此添加到您的函数中。php：

function next_posts_link_css($content) { 
    return \'class="next"\';
}
function previous_posts_link_css($content) { 
    return \'class="prev"\';
}

add_filter(\'next_posts_link_attributes\', \'next_posts_link_css\' );
add_filter(\'previous_posts_link_attributes\', \'previous_posts_link_css\' );

我只是想澄清一下。您将在模板文件中使用常规分页：

<?php previous_posts_link(\'Previous\') ?>
<?php next_posts_link(\'Next\') ?>