我正在使用的wordpress主题中的当前Prev和Next按钮是通过functions中的此函数呈现的。php：

if ( !function_exists( \'krunk_post_navigation\' ) ) {
    function krunk_post_navigation( $direction, $posting, $term ) {

        $post_navigation = \'\';

        if( $posting ) {

            $post_navigation .= \'<a class="post-navi-\' . $direction . \' clearfix" href="\' . get_permalink( $posting->ID ) . \'">\' .
                                    \'<div class="post-navi-inner">\';
                                        $post_navigation .= \'<div class="post-navi-\' . $direction . \'-info">\' .
                                            \'<div class="table-cell-middle">\' .
                                                \'<div class="post-navi-label"><i class="fa fa-long-arrow-left"></i>\' . esc_attr( $term ) . \'<i class="fa fa-long-arrow-right"></i></div>\' .
                                            \'</div>\' .
                                        \'</div>\' .
                                    \'</div>\' .
                                \'</a>\';


        }

        return $post_navigation;
    }
}

$previousPost = get_previous_post();
$previousThumbnail = get_the_post_thumbnail( $previousPost->ID );
$nextPost = get_next_post();
$nextThumbnail = get_the_post_thumbnail( $nextPost->ID );