我有一家 woocommerce 商店，其自訂分類為「運動」。此分類有三個等級 - 父級、子級、子級 - 例如：室內運動 > 競技場運動 > 籃球。如果使用者查看籃球項目，那麼我希望相關產品優先顯示其他籃球項目，然後在沒有足夠的籃球項目時回退到 Arena Sport 項目。因此，首先檢查最低級別 - Sub-Child，然後是 Child，然後是 Parent。
此外，我使用 RankMath，並且可以將分類術語設定為「主要」術語。因此，在上面的範例中，主要術語是籃球。主要術語幾乎總是子子術語，但也可能是子術語。
我結合了其他兩個問題的回答，程式碼的工作原理是從運動分類中選擇相關產品。但它只看子級別，不考慮子級別。因此，在上面的範例中，它選擇 Arena Sports 中的項目，而不優先考慮籃球。
我應該進行哪些更改才能確保相關產品看到“主要”分類術語，然後首先查找具有該術語的產品，然後（如有必要）在術語層次結構的下一級中查找？
感謝您提供的任何幫助或建議。
我在起草程式碼時參考了這兩篇文章：
以兒童類別劃分的 WooCommerce 相關產品作為排名數學主要類別的後備
使用自訂分類法在 Woocommerce 中選擇相關產品
這是我目前正在使用的程式碼：
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;
} 
嘗試以下操作（已評論）：
// 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; }它應該可以工作。