如何利用WordPress函数生成Bootstrap4分页呢？因为wordpress默认仅仅提供简单分页, 所以要实现数字分页，需要自定义函数,wordpress可以结合bootstrap制作分页，bootstrap提供了分页的样式，可以减少对样式的书写。

    我们先看下 Bootstrap4 默认的分页结构

    1. <nav aria-label="Page navigation example">
    2.     <ul class="pagination">
    3.         <li class="page-item">
    4.             <a class="page-link" href="#">Previous</a>
    5.         </li>
    6.         <li class="page-item">
    7.             <a class="page-link" href="#">1</a>
    8.         </li>
    9.         <li class="page-item">
    10.             <a class="page-link" href="#">2</a>
    11.         </li>
    12.         <li class="page-item">
    13.             <a class="page-link" href="#">3</a>
    14.         </li>
    15.         <li class="page-item">
    16.             <a class="page-link" href="#">Next</a>
    17.         </li>
    18.     </ul>
    19. </nav>

    根据以上结构，我们构建一个函数，并放到 function.php 中。

    <?php
/**
 * WordPress适配Bootstrap4 之 分页
 * http://www.inli.work/wordpress-adapter-bootstrap4-paging.html
 */
function ribs_pagenavi($before = '', $after = '', $p = 1) {
    if (is_singular()) return;
    global $wp_query, $paged;
    $max_page = $wp_query->max_num_pages;
    if ($max_page <= 1) return;
    if (empty($paged)) $paged = 1;
    echo $before . '<ul class="pagination mb-0">' . "\n";
    if ($paged == 1) echo '<li class="page-item disable prev"><a class="page-link">上一页</a></li>';
    //if ( $paged > 1 ) p_link( $paged - 1, '上页', '上页' );
    if ($paged > 1) echo "<li class='page-item prev'><a class='page-link' href='", esc_html(get_pagenum_link($paged - 1)), "' title='上一页'>上一页</a></li>";
    if ($paged > $p + 1) p_link(1, '首页');
    if ($paged > $p + 2) echo '<li class="page-item disable"><a class="page-link">...</a></li>';
    for ($i = $paged - $p;$i <= $paged + $p;$i++) {
        if ($i > 0 && $i <= $max_page) $i == $paged ? print "<li class='page-item active'><span class='page-link'>{$i}<span class='sr-only'>(current)</span></span></li>" : p_link($i);
    }
    if ($paged < $max_page - $p - 1) echo '<li class="page-item disable"><a class="page-link">...</a></li>';
    if ($paged < $max_page - $p) p_link($max_page, '尾页');
    //if ( $paged < $max_page ) p_link( $paged + 1,'下页', '下页' );
    if ($paged < $max_page) echo "<li class='page-item next'><a class='page-link' href='", esc_html(get_pagenum_link($paged + 1)), "' title='下一页'>下一页</a></li>";
    if ($paged == $max_page) echo '<li class="page-item disable next"><a class="page-link">下一页</a></li>';
    echo '</ul>' . $after . "\n";
}
function p_link($i, $title = '', $linktype = '') {
    if ($title == '') $title = "第 {$i} 页";
    if ($linktype == '') {
        $linktext = $i;
    } else {
        $linktext = $linktype;
    }
    echo "<li class='page-item'><a class='page-link' href='", esc_html(get_pagenum_link($i)), "' title='{$title}'>{$linktext}</a></li>";
}

    最后在需要分页的地方,引用

    <?php  ribs_pagenavi('<nav class="post-pagenavi my-5">', '</nav>', 1); ?>