您需要首先对类别进行排序。

// get categories of post in sorted order
$categories = sortCategories(get_the_category());     

foreach($categories AS $category) {
    echo $category->name; // Plot category name
}
echo get_the_title(); // Plot post name

function sortCategories($categories) { // Sorting the category
    usort($categories, "cmpCategories");
    return $categories;
}

function cmpCategories($category_1,$category_2) { // Sort function
    foreach(get_categories(array("parent" => $category_1->cat_ID)) AS $sub) {
        if($category_2->cat_ID == $sub->cat_ID) return -1;
    }
    return 1;
}

这应该可以做到：

$cats = get_the_category(); //retrieve cats for post

foreach ($cats as $cat) { //go thru to find child one - means cat which has specified parent id
    if ($cat->category_parent != 0) {
        $child = $cat->term_taxonomy_id;
    }
}
echo get_category_parents( $child, TRUE, \' > \' );

以下是我的工作解决方案：

$categories = get_the_category();

$ordering = array();
foreach( $categories as $index => $cat) {
    $ordering[$cat->parent] = $index;
}

$ordered_string = "";
$i = 0;
while( $ordering[$i] !== null ){
    $ordered_string .= \'<li class="item-cat"><a href="\'.get_category_link( $categories[$ordering[$i]]->term_id ).\'">\'.$categories[$ordering[$i]]->name.\'</li>\';

    $i = $categories[$ordering[$i]]->term_id;
}

echo $ordered_string;

对我来说，这是一个老问题，但在谷歌上排名第一。我无法快速找到面包屑分类，它支持多个类别，所以我创建了一个并将其包装在ul 为便于造型：

// breadcrumb categorization
$cats = wp_get_post_categories( get_the_ID() );  //post id
foreach($cats as $c) {
    $ancestors = array_merge( array_reverse( get_ancestors( $c, \'category\' ) ), [$c] );
    echo \'<ul class="post-categories">\';
    foreach($ancestors as $id){
        echo \'<li><a href="\' . esc_url( get_category_link( $id) ) . \'">\' . get_cat_name( $id ) . \'</a></li>\';
    }
    echo \'</ul>\';
}