我有一家 woocommerce 商店，其自定义分类为“运动”。该分类具有三个级别 - 父级、子级、子级 - 例如：室内运动 > 竞技场运动 > 篮球。如果用户查看篮球项目，那么我希望相关产品优先显示其他篮球项目，然后在没有足够的篮球项目时回退到 Arena Sport 项目。因此，首先检查最低级别 - Sub-Child，然后是 Child，然后是 Parent。
此外，我使用 RankMath，并且可以将分类术语设置为“主要”术语。因此，在上面的示例中，主要术语是篮球。主要术语几乎总是子子术语，但也可能是子术语。
我结合了其他两个问题的回答，代码的工作原理是从运动分类中选择相关产品。但它只看子级别，不考虑子子级别。因此，在上面的示例中，它选择 Arena Sports 中的项目，而不优先考虑篮球。
我应该进行哪些更改才能确保相关产品看到“主要”分类术语，然后首先查找具有该术语的产品，然后（如有必要）在术语层次结构的下一级中查找？
感谢您提供的任何帮助或建议。
我在起草代码时参考了这两篇文章：
按儿童类别划分的 WooCommerce 相关产品作为排名数学主要类别的后备
使用自定义分类法在 Woocommerce 中选择相关产品
这是我当前正在使用的代码：
add_filter( 'woocommerce_related_products', 'related_products_from_rankmath_primary_esporte_taxonomy', 10, 3 );
function related_products_from_rankmath_primary_esporte_taxonomy( $related_posts, $product_id, $args ) {
$taxonomy = 'sport';
$term_ids = wp_get_post_terms( $product_id, $taxonomy, array( 'fields' => 'ids' ) );
$term_slugs = array();
if( count($term_ids) == 1 ) {
// Get children categories
$children_ids = get_term_children( reset($category_ids), $taxonomy );
// Loop through children terms Ids
foreach ( $children_ids as $tem_id ) {
$term_slugs[] = get_term_by( 'id', $tem_id, $taxonomy )->slug; // get the slug from each term Id
}
}
elseif( count( $term_ids ) > 1 ) {
// Get the primary taxonomy/term as saved by Rank Math SEO
$primary_tax_id = get_post_meta( $product_id, 'rank_math_primary_taxonomy', true );
$term_slugs[] = get_term_by( 'id', $primary_tax_id, $taxonomy )->slug; // get the slug from the term Id
}
if ( count( $term_ids ) > 0 ) {
foreach ( $term_ids as $term_id ) {
$term_slugs[] = get_term_by( 'id', $term_id, $taxonomy )->slug;
// Gets the IDs of child terms
$children_ids = get_term_children( $term_id, $taxonomy );
foreach ( $children_ids as $child_id ) {
$term_slugs[] = get_term_by( 'id', $child_id, $taxonomy )->slug; // Gets the slug of each child term
}
}
$related_posts = wc_get_products( array(
'status' => 'publish',
'tax_query' => array(
array(
'taxonomy' => $taxonomy,
'field' => 'slug',
'terms' => $term_slugs,
),
),
'return' => 'ids',
'exclude' => array( $product_id ),
'visibility' => 'catalog',
'limit' => -1,
) );
}
return $related_posts;
} 
尝试以下操作（已评论）：
// Utility function: Get related product Ids with a custom tax query function get_related_posts_custom_query( $term_slugs, $taxonomy, $product_id ) { return wc_get_products( array( 'limit' => -1, 'status' => 'publish', 'exclude' => array( $product_id ), 'visibility' => 'catalog', 'tax_query' => array( array( 'taxonomy' => $taxonomy, 'field' => 'slug', 'terms' => $term_slugs, ), ), 'return' => 'ids', ) ); } add_filter( 'woocommerce_related_products', 'related_products_from_rank_math_primary_category', 10, 3 ); function related_products_from_rank_math_primary_category( $related_posts, $product_id, $args ) { // Get product categories set for the product $category_ids = wp_get_post_terms($product_id, 'product_cat', array('fields' => 'ids') ); $term_slugs = array(); // Initializing // 1). Only one product category => Fallback (Query products from "Sport" taxonomy) if( count($category_ids) == 1 ) { $taxonomy = 'sport'; // Get "Sport" the term set in the product $sport_ids = wp_get_post_terms($product_id, $taxonomy, array('fields' => 'ids') ); $term = get_term_by( 'id', reset($sport_ids), $taxonomy ); $term_slugs[] = $term ->slug; // Get related products from the "Sport" term $related_posts = get_related_posts_custom_query( $term_slugs, $taxonomy, $product_id ); // IF there is not enough related products: Add the CHILDREN terms if ( $related_posts 0 ) { foreach ( $children_ids as $tem_id ) { $term_slugs[] = get_term_by( 'id', $tem_id, $taxonomy )->slug; // get the slug from each term Id } // Get related products from the "Sport" terms $related_posts = get_related_posts_custom_query( $term_slugs, $taxonomy, $product_id ); } // IF there is not enough related products: Add the PARENT term if ( $related_posts parent, $taxonomy ); $term_slugs[] = $parent ->slug; // Get related products from the "Sport" terms return get_related_posts_custom_query( $term_slugs, $taxonomy, $product_id ); } else { return $related_posts; } } else { return $related_posts; } } // 2). More than one product categories => Rank Math SEO elseif( count( $category_ids ) > 1 ) { // Get the primary category/term as saved by Rank Math SEO $primary_cat_id = get_post_meta( $product_id, 'rank_math_primary_product_cat', true ); $taxonomy = 'product_cat'; $term_slugs[] = get_term_by( 'id', $primary_cat_id, $taxonomy )->slug; // get the slug from the term Id // Get related products from the category terms via Rank Math SEO return get_related_posts_custom_query( $term_slugs, $taxonomy, $product_id ); } return $related_posts; }它应该可以工作。