/* ---------------------------------------------------------- */ //                文章前后导航代码片段                   // /* ---------------------------------------------------------- */ function sp_post_nav_shortcode( $atts ) {    $atts = shortcode_atts( array(       'type' => 'next', // 默认显示下一篇   ), $atts, 'sp_post_nav' );    // 获取上一篇或下一篇   $post = $atts['type'] === 'prev' ? get_previous_post() : get_next_post();    // 箭头图标类名   $arrow_class = $atts['type'] === 'prev' ? 'fas fa-arrow-left' : 'fas fa-arrow-right';      // 容器类名     $link_class = $atts['type'] === 'prev' ? 'prev' : 'next';    if ( $post ) {        $post_title = get_the_title( $post );        $sp_post_nav = '<a class="post-link ' . $link_class . '" href="' . esc_url( get_permalink( $post ) ) . '">';       $sp_post_nav .= '<i class="' . $arrow_class . '"></i>';       $sp_post_nav .= '<div class="inner-wrapper">';       $sp_post_nav .= $atts['type'] === 'prev' ? '<p>上一篇文章:</p>' : '<p>下一篇文章:</p>';       $sp_post_nav .= '<h6>' . $post_title . '</h6>';       $sp_post_nav .= '</div>';       $sp_post_nav .= '</a>';        return $sp_post_nav;   }    return ''; } add_shortcode( 'sp_post_nav', 'sp_post_nav_shortcode' );