2019添加WordPress面包屑（Breadcrumbs）导航代码

你在寻找一种方法来添加面包屑导航并在WordPress中显示它们吗？我们这有代码片段能实现，你可以使用它在WordPress中添加面包屑（Breadcrumbs）。

将此代码添加到主题的functions.php文件：

function dimox_breadcrumbs() {

$delimiter = '»';
$name = 'Home'; //text for the 'Home' link
$currentBefore = '<span class="current">';
$currentAfter = '</span>';

if ( !is_home() && !is_front_page() || is_paged() ) {

echo '<div id="crumbs">';

global $post;
$home = get_bloginfo('url');
echo '<a href="' . $home . '">' . $name . '</a> ' . $delimiter . ' ';

if ( is_category() ) {
global $wp_query;
$cat_obj = $wp_query->get_queried_object();
$thisCat = $cat_obj->term_id;
$thisCat = get_category($thisCat);
$parentCat = get_category($thisCat->parent);
if ($thisCat->parent != 0) echo(get_category_parents($parentCat, TRUE, ' ' . $delimiter . ' '));
echo $currentBefore . 'Archive by category '';
single_cat_title();
echo ''' . $currentAfter;

} elseif ( is_day() ) {
echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
echo '<a href="' . get_month_link(get_the_time('Y'),get_the_time('m')) . '">' . get_the_time('F') . '</a> ' . $delimiter . ' ';
echo $currentBefore . get_the_time('d') . $currentAfter;

} elseif ( is_month() ) {
echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
echo $currentBefore . get_the_time('F') . $currentAfter;

} elseif ( is_year() ) {
echo $currentBefore . get_the_time('Y') . $currentAfter;

} elseif ( is_single() && !is_attachment() ) {
$cat = get_the_category(); $cat = $cat[0];
echo get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
echo $currentBefore;
the_title();
echo $currentAfter;

} elseif ( is_attachment() ) {
$parent = get_post($post->post_parent);
$cat = get_the_category($parent->ID); $cat = $cat[0];
echo get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
echo '<a href="' . get_permalink($parent) . '">' . $parent->post_title . '</a> ' . $delimiter . ' ';
echo $currentBefore;
the_title();
echo $currentAfter;

} elseif ( is_page() && !$post->post_parent ) {
echo $currentBefore;
the_title();
echo $currentAfter;

} elseif ( is_page() && $post->post_parent ) {
$parent_id= $post->post_parent;
$breadcrumbs = array();
while ($parent_id) {
$page = get_page($parent_id);
$breadcrumbs[] = '<a href="' . get_permalink($page->ID) . '">' . get_the_title($page->ID) . '</a>';
$parent_id= $page->post_parent;
}
$breadcrumbs = array_reverse($breadcrumbs);
foreach ($breadcrumbs as $crumb) echo $crumb . ' ' . $delimiter . ' ';
echo $currentBefore;
the_title();
echo $currentAfter;

} elseif ( is_search() ) {
echo $currentBefore . 'Search results for '' . get_search_query() . ''' . $currentAfter;

} elseif ( is_tag() ) {
echo $currentBefore . 'Posts tagged '';
single_tag_title();
echo ''' . $currentAfter;

} elseif ( is_author() ) {
 global $author;
$userdata = get_userdata($author);
echo $currentBefore . 'Articles posted by ' . $userdata->display_name . $currentAfter;

} elseif ( is_404() ) {
echo $currentBefore . 'Error 404' . $currentAfter;
}

if ( get_query_var('paged') ) {
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' (';
echo __('Page') . ' ' . get_query_var('paged');
if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')';
}

echo '</div>';

}
}

将此代码添加到主题的模板文件中（比如single.php），要显示面包屑导航的位置：

<?php 
 if (function_exists('dimox_breadcrumbs')) dimox_breadcrumbs(); 
?>

或者，你可以使用这个更简短的代码段。将此代码添加到主题的functions.php文件中：

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>';
}

同样的，你可以将此代码添加到single.php文件或page.php以显示breadcrumbs菜单：

<?php the_breadcrumb(); ?>