最近开始整理 WordPress 的插件,发现有些插件功能越来越重,比如 Yoast SEO 的插件,出于个人洁癖就把他删除了。但是目前网站原来的 Breadcrumbs 导航功能是这个插件提供的,所以就开始查找替换方案。网上搜索发现一片文章介绍的比较具体 --- 《WordPress实现面包屑导航的方法》,博主其实也是参考了国外网友的非插件实现

以下代码都是基于 Dimox 的原创,我只是在他基础上做了微调,改动不大:

/*
 * Show breadcrumb by Dimox
 * URL: http://dimox.net/wordpress-breadcrumbs-without-a-plugin/
 * Version: 2017.21.01
 * License: MIT
 */
function dangopress_breadcrumb()
{
    /* === OPTIONS === */
    $text['home']     = '首页'; // text for the 'Home' link
    $text['category'] = '%s'; // text for a category page
    $text['search']   = '"%s" 的搜索结果'; // text for a search results page
    $text['tag']      = '包含标签 "%s" 的文章'; // text for a tag page
    $text['404']      = '页面未到到'; // text for the 404 page
    $text['page']     = 'Page %s'; // text 'Page N'
    $text['cpage']    = 'Comment Page %s'; // text 'Comment Page N'

    $prefix         = '<i class="icon-windows"></i>'; // Prefix the breadcrumb
    $wrap_before    = '<div class="breadcrumbs" id="site-breadcrumbs" itemscope itemtype="http://schema.org/BreadcrumbList">'; // the opening wrapper tag
    $wrap_after     = '</div><!-- .breadcrumbs -->'; // the closing wrapper tag
    $sep            = '<i class="icon-caret-right"></i>'; // separator between crumbs
    $sep_before     = '<span class="sep">'; // tag before separator
    $sep_after      = '</span>'; // tag after separator
    $show_home_link = 0; // 1 - show the 'Home' link, 0 - don't show
    $show_current   = 1; // 1 - show current page title, 0 - don't show
    $before         = '<h1 class="current-crumb">'; // tag before the current crumb
    $after          = '</h1>'; // tag after the current crumb
    /* === END OF OPTIONS === */

    global $post;
    $home_url       = home_url('/');

    $link_before    = '<span itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">';
    $link_after     = '</span>';
    $link_attr      = ' itemprop="item"';
    $link_in_before = '<span itemprop="name">';
    $link_in_after  = '</span>';
    $link           = $link_before . '<a href="%1$s"' . $link_attr . '>' . $link_in_before . '%2$s' . $link_in_after . '</a>' . $link_after;

    $frontpage_id   = get_option('page_on_front');
    $parent_id      = ($post) ? $post->post_parent : '';
    $sep            = ' ' . $sep_before . $sep . $sep_after . ' ';
    $home_link      = $link_before . '<a rel="nofollow" href="' . $home_url . '"' . $link_attr . ' class="home">' . $link_in_before . $text['home'] . $link_in_after . '</a>' . $link_after;

    if (is_home() || is_front_page()) {
        return;
    } else {
        echo $wrap_before . $prefix;
        if ($show_home_link) echo $home_link;

        if ( is_category() ) {
            $cat = get_category(get_query_var('cat'), false);
            if ($cat->parent != 0) {
                $cats = get_category_parents($cat->parent, TRUE, $sep);
                $cats = preg_replace("#^(.+)$sep$#", "$1", $cats);
                $cats = preg_replace('#<a([^>]+)>([^<]+)<\/a>#', $link_before . '<a$1' . $link_attr .'>' . $link_in_before . '$2' . $link_in_after .'</a>' . $link_after, $cats);
                if ($show_home_link) echo $sep;
                echo $cats;
            }
            if ( get_query_var('paged') ) {
                $cat = $cat->cat_ID;
                echo $sep . sprintf($link, get_category_link($cat), get_cat_name($cat)) . $sep . $before . sprintf($text['page'], get_query_var('paged')) . $after;
            } else {
                if ($show_current) echo $sep . $before . sprintf($text['category'], single_cat_title('', false)) . $after;
            }
        } elseif ( is_search() ) {
            if (have_posts()) {
                if ($show_home_link && $show_current) echo $sep;
                if ($show_current) echo $before . sprintf($text['search'], get_search_query()) . $after;
            } else {
                if ($show_home_link) echo $sep;
                echo $before . sprintf($text['search'], get_search_query()) . $after;
            }
        } elseif ( is_day() ) {
            if ($show_home_link) echo $sep;
            echo sprintf($link, get_year_link(get_the_time('Y')), get_the_time('Y')) . $sep;
            echo sprintf($link, get_month_link(get_the_time('Y'), get_the_time('m')), get_the_time('F'));
            if ($show_current) echo $sep . $before . get_the_time('d') . $after;
        } elseif ( is_month() ) {
            if ($show_home_link) echo $sep;
            echo sprintf($link, get_year_link(get_the_time('Y')), get_the_time('Y'));
            if ($show_current) echo $sep . $before . get_the_time('F') . $after;
        } elseif ( is_year() ) {
            if ($show_home_link && $show_current) echo $sep;
            if ($show_current) echo $before . get_the_time('Y') . $after;
        } elseif ( is_single() && !is_attachment() ) {
            if ($show_home_link) echo $sep;
            if ( get_post_type() != 'post' ) {
                $post_type = get_post_type_object(get_post_type());
                $slug = $post_type->rewrite;
                printf($link, $home_url . $slug['slug'] . '/', $post_type->labels->singular_name);
                if ($show_current) echo $sep . $before . get_the_title() . $after;
            } else {
                $cat = get_the_category(); $cat = $cat[0];
                $cats = get_category_parents($cat, TRUE, $sep);
                if (!$show_current || get_query_var('cpage')) $cats = preg_replace("#^(.+)$sep$#", "$1", $cats);
                $cats = preg_replace('#<a([^>]+)>([^<]+)<\/a>#', $link_before . '<a$1' . $link_attr .'>' . $link_in_before . '$2' . $link_in_after .'</a>' . $link_after, $cats);
                echo $cats;
                if ( get_query_var('cpage') ) {
                    echo $sep . sprintf($link, get_permalink(), get_the_title()) . $sep . $before . sprintf($text['cpage'], get_query_var('cpage')) . $after;
                } else {
                    if ($show_current) echo $before . get_the_title() . $after;
                }
            }
        // custom post type
        } elseif ( !is_single() && !is_page() && get_post_type() != 'post' && !is_404() ) {
            $post_type = get_post_type_object(get_post_type());
            if ( get_query_var('paged') ) {
                echo $sep . sprintf($link, get_post_type_archive_link($post_type->name), $post_type->label) . $sep . $before . sprintf($text['page'], get_query_var('paged')) . $after;
            } else {
                if ($show_current) echo $sep . $before . $post_type->label . $after;
            }
        } elseif ( is_attachment() ) {
            if ($show_home_link) echo $sep;
            $parent = get_post($parent_id);
            $cat = get_the_category($parent->ID); $cat = $cat[0];
            if ($cat) {
                $cats = get_category_parents($cat, TRUE, $sep);
                $cats = preg_replace('#<a([^>]+)>([^<]+)<\/a>#', $link_before . '<a$1' . $link_attr .'>' . $link_in_before . '$2' . $link_in_after .'</a>' . $link_after, $cats);
                echo $cats;
            }
            printf($link, get_permalink($parent), $parent->post_title);
            if ($show_current) echo $sep . $before . get_the_title() . $after;
        } elseif ( is_page() && !$parent_id ) {
            if ($show_current) echo $sep . $before . get_the_title() . $after;
        } elseif ( is_page() && $parent_id ) {
            if ($show_home_link) echo $sep;
            if ($parent_id != $frontpage_id) {
                $breadcrumbs = array();
                while ($parent_id) {
                    $page = get_page($parent_id);
                    if ($parent_id != $frontpage_id) {
                        $breadcrumbs[] = sprintf($link, get_permalink($page->ID), get_the_title($page->ID));
                    }
                    $parent_id = $page->post_parent;
                }
                $breadcrumbs = array_reverse($breadcrumbs);
                for ($i = 0; $i < count($breadcrumbs); $i++) {
                    echo $breadcrumbs[$i];
                    if ($i != count($breadcrumbs)-1) echo $sep;
                }
            }
            if ($show_current) echo $sep . $before . get_the_title() . $after;
        } elseif ( is_tag() ) {
            if ( get_query_var('paged') ) {
                $tag_id = get_queried_object_id();
                $tag = get_tag($tag_id);
                echo $sep . sprintf($link, get_tag_link($tag_id), $tag->name) . $sep . $before . sprintf($text['page'], get_query_var('paged')) . $after;
            } else {
                if ($show_current) echo $sep . $before . sprintf($text['tag'], single_tag_title('', false)) . $after;
            }
        } elseif ( is_404() ) {
            if ($show_home_link && $show_current) echo $sep;
            if ($show_current) echo $before . $text['404'] . $after;
        } elseif ( has_post_format() && !is_singular() ) {
            if ($show_home_link) echo $sep;
            echo get_post_format_string( get_post_format() );
        }
        echo $wrap_after;
    }
}

同时,我也把这个很棒的功能引入到 dangopress 主题 里面了,有兴趣的同学可以下载下来尝试下效果,这个主题接下来我还会继续维护。

我的网站效果:

面包屑导航效果

-- END --

转载请注明转自: 团子的小窝 , 本文固定链接: 非插件实现面包屑导航功能