代码有一些上面提供的bug。使用以下代码也可以在“快速编辑”模式中工作：How to hook into the quick edit action? （提供人：Pieter Goosen)

add_action(\'save_post\', \'assign_parent_terms\');

function assign_parent_terms($post_id){
global $post;

if(isset($post) && $post->post_type != \'product\')
return $post_id;

// get all assigned terms   
$terms = wp_get_post_terms($post_id, \'product_cat\' );
foreach($terms as $term){
while($term->parent != 0 && !has_term( $term->parent, \'product_cat\', $post )){
    // move upward until we get to 0 level terms
    wp_set_object_terms($post_id, array($term->parent), \'product_cat\', true);
    $term = get_term($term->parent, \'product_cat\');
     }
  }
}

上述选项应该可以工作，无论何时设置术语，此功能都可以用于任何对象，并使用set_object_terms 允许您让操作句柄向上遍历层次结构

add_action( \'set_object_terms\', \'auto_set_parent_terms\', 9999, 6 );

/**
 * Automatically set/assign parent taxonomy terms to posts
 * 
 * This function will automatically set parent taxonomy terms whenever terms are set on a post,
 * with the option to configure specific post types, and/or taxonomies.
 *
 *
 * @param int    $object_id  Object ID.
 * @param array  $terms      An array of object terms.
 * @param array  $tt_ids     An array of term taxonomy IDs.
 * @param string $taxonomy   Taxonomy slug.
 * @param bool   $append     Whether to append new terms to the old terms.
 * @param array  $old_tt_ids Old array of term taxonomy IDs.
 */
function auto_set_parent_terms( $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids ) {

    /**
     * We only want to move forward if there are taxonomies to set
     */
    if( empty( $tt_ids ) ) return FALSE;

    /**
     * Set specific post types to only set parents on.  Set $post_types = FALSE to set parents for ALL post types.
     */
    $post_types = array( \'product\' );
    if( $post_types !== FALSE && ! in_array( get_post_type( $object_id ), $post_types ) ) return FALSE;

    /**
     * Set specific post types to only set parents on.  Set $post_types = FALSE to set parents for ALL post types.
     */
    $tax_types = array( \'product_cat\' );
    if( $tax_types !== FALSE && ! in_array( get_post_type( $object_id ), $post_types ) ) return FALSE;

    foreach( $tt_ids as $tt_id ) {

        $parent = wp_get_term_taxonomy_parent_id( $tt_id, $taxonomy );

        if( $parent ) {
            wp_set_post_terms( $object_id, array($parent), $taxonomy, TRUE );
        }

    }

}

改进了！Sisir厚度

现在，您可以定义多个帖子类型和术语。

您可以在（$arrayPostTypeAllowed）数组中定义允许的Post类型，并在（$arrayTermsAllowed）数组中定义允许的术语。

add_action(\'save_post\', \'assign_parent_terms\', 10, 2);

function assign_parent_terms($post_id, $post){
    $arrayPostTypeAllowed = array(\'product\');
    $arrayTermsAllowed = array(\'product_cat\');

    //Check post type
    if(!in_array($post->post_type, $arrayPostTypeAllowed)){
        return $post_id;
    }else{

        // get all assigned terms   
        foreach($arrayTermsAllowed AS $t_name){
            $terms = wp_get_post_terms($post_id, $t_name );

            foreach($terms as $term){

                while($term->parent != 0 && !has_term( $term->parent, $t_name, $post )){

                    // move upward until we get to 0 level terms
                    wp_set_post_terms($post_id, array($term->parent), $t_name, true);
                    $term = get_term($term->parent, $t_name);
                }
            }
        }
    }
}