有很多插件提供面包屑，但您也可以创建自己的插件。

要创建一个简单的面包屑，需要2个函数。一个用于创建类别链，另一个用于生成面包屑本身。

创建类别链

function wpse_get_category_parents( $id, $link = false, $separator = \'/\', $nicename = false, $visited = array(), $iscrumb=false ) {
    $chain = \'\';
    $parent = get_term( $id, \'category\' );
    if ( is_wp_error( $parent ) ) {
        return $parent;
    }
    if ( $nicename ) {
        $name = $parent->slug;
    } else {
        $name = $parent->name;
    }
    if ( $parent->parent && ( $parent->parent != $parent->term_id ) && !in_array( $parent->parent, $visited ) ) {
        $visited[] = $parent->parent;
        $chain .= wpse_get_category_parents( $parent->parent, $link, $separator, $nicename, $visited , $iscrumb);
    }
    if (is_rtl()){
        $sep_direction =\'\\\\\';
    } else {
        $sep_direction =\'/\';
    }
    if ($iscrumb){
        $chain .= \'<li><span class="sep">\'.$sep_direction.\'</span><a href="\' . esc_url( get_category_link( $parent->term_id ) ) . \'"><span>\'.$name.\'</span></a></li>\' . $separator ;
    } elseif ( $link && !$iscrumb) {
        $chain .= \'<a href="\' . esc_url( get_category_link( $parent->term_id ) ) . \'">\'.$name.\'</a>\' . $separator ;
    } else {
        $chain .= $name.$separator;
    }
    return $chain;
}

function wpse_get_breadcrumbs() {
    global $wp_query;
        if (is_rtl()){
            $sep_direction =\'\\\\\';
        } else {
            $sep_direction =\'/\';
        }?>
    <ul><?php
        // Adding the Home Page  ?>
        <li><a href="<?php echo esc_url( home_url() ); ?>"><span> <?php bloginfo(\'name\'); ?></span></a></li><?php
        if ( ! is_front_page() ) {
            // Check for categories, archives, search page, single posts, pages, the 404 page, and attachments
            if ( is_category() ) {
                $cat_obj     = $wp_query->get_queried_object();
                $thisCat     = get_category( $cat_obj->term_id );
                $parentCat   = get_category( $thisCat->parent );
                if($thisCat->parent != 0) {
                    $cat_parents = wpse_get_category_parents( $parentCat, true, \'\', false, array(), true );
                }
                if ( $thisCat->parent != 0 && ! is_wp_error( $cat_parents ) ) {
                    echo $cat_parents;
                }
                echo \'<li><span class="sep">\'.$sep_direction.\'</span><a href="\'.get_category_link($thisCat).\'"><span>\'.single_cat_title( \'\', false ).\'</span></a></li>\';
            } elseif ( is_archive() && ! is_category() ) { ?>
                <li><span class="sep"><?php echo $sep_direction;?></span> <?php _e( \'Archives\' ); ?></li><?php
            } elseif ( is_search() ) { ?>
                <li><span class="sep"><?php echo $sep_direction;?></span> <?php _e( \'Search Results\' ); ?></li><?php
            } elseif ( is_404() ) { ?>
                <li><span class="sep"><?php echo $sep_direction;?></span> <?php _e( \'404 Not Found\' ); ?></li><?php
            } elseif ( is_singular() ) {
                $category    = get_the_category();
                $category_id = get_cat_ID( $category[0]->cat_name );
                $cat_parents = wpse_get_category_parents( $category_id, true, \'\',false, array(), true );
                if ( ! is_wp_error( $cat_parents ) ) {
                    echo $cat_parents;
                }?>
                <li>
                    <a href="<?php the_permalink();?>"><span class="sep"><?php echo $sep_direction;?></span><?php the_title();?></a>
                </li><?php
            } elseif ( is_singular( \'attachment\' ) ) { ?>
                <li>
                    <span class="sep"><?php echo $sep_direction;?></span> <?php the_title(); ?>
                </li><?php
            } elseif ( is_page() ) {
                $post = $wp_query->get_queried_object();
                if ( $post->post_parent == 0 ) { ?>
                    <li><?php _e( \'<span class="sep">/</span>\' ); the_title(); ?></li><?php
                } else {
                    $title = the_title( \'\',\'\', false );
                    $ancestors = array_reverse( get_post_ancestors( $post->ID ) );
                    array_push( $ancestors, $post->ID );
                    foreach ( $ancestors as $ancestor ) {
                        if ( $ancestor != end( $ancestors ) ) { ?>
                            <li>
                                <span class="sep"><?php echo $sep_direction;?></span><a href="<?php echo esc_url( get_permalink( $ancestor ) ); ?>"> <span><?php echo strip_tags( apply_filters( \'single_post_title\', get_the_title( $ancestor ) ) ); ?></span></a>
                            </li><?php
                        } else { ?>
                            <li>
                                <span class="sep"><?php echo $sep_direction;?></span><?php echo strip_tags( apply_filters( \'single_post_title\', get_the_title( $ancestor ) ) ); ?>
                            </li><?php
                        }
                    }
                }
            }
        } ?>
    </ul><?php
}

if( ! is_home() ) {
    wpse_get_breadcrumbs();
}

无需使用任何插件，您就可以向网站添加自定义面包屑。请尝试简单面包屑的示例代码（在functions.php中）

function the_breadcrumb() {
    echo \'<ul id="crumbs">\';
if (!is_home()) {
    echo \'<li><a href="\';
    echo get_option(\'home\');
    echo \'">\';
    echo \'Home\';
    echo "</a></li>";
    if (is_category() || is_single()) {
        echo \'<li>\';
        the_category(\' </li><li> \');
        if (is_single()) {
            echo "</li><li>";
            the_title();
            echo \'</li>\';
        }
    } elseif (is_page()) {
        echo \'<li>\';
        echo the_title();
        echo \'</li>\';
    }
}
elseif (is_tag()) {single_tag_title();}
elseif (is_day()) {echo"<li>Archive for "; the_time(\'F jS, Y\'); echo\'</li>\';}
elseif (is_month()) {echo"<li>Archive for "; the_time(\'F, Y\'); echo\'</li>\';}
elseif (is_year()) {echo"<li>Archive for "; the_time(\'Y\'); echo\'</li>\';}
elseif (is_author()) {echo"<li>Author Archive"; echo\'</li>\';}
elseif (isset($_GET[\'paged\']) && !empty($_GET[\'paged\'])) {echo "<li>Blog Archives"; echo\'</li>\';}
elseif (is_search()) {echo"<li>Search Results"; echo\'</li>\';}
echo \'</ul>\';

在要显示面包屑的页面中添加以下短代码

<?php the_breadcrumb(); ?>

面包屑是几乎所有优秀网站的重要组成部分。这些小小的导航辅助工具不仅告诉人们他们在你的网站上的位置，还帮助谷歌确定你的网站是如何构建的。这就是为什么添加这些有用的小指针很有意义。让我们看看面包屑是如何工作的。

您可以安装https://yoast.com/ 免费插件。