WordPress函数get_ancestors()用法 获取当前分类页面链接的父级节点信息

描述：

获取当前分类/页面/链接的父级节点信息

用法：

<?php get_ancestors( $object_id, $object_type ); ?>

参数：

$object_id

(int or string) (必填) 子分类ID

默认值: None

$object_type

(string) (必填) 对象类型的名称（页、层次文章类型、类别或层次分类法）

默认值: None

示例：

<?php get_ancestors( 208, 'category' ); ?>

源文件：

/**
* Get an array of ancestor IDs for a given object.
*
* @since 3.1.0
* @since 4.1.0 Introduced the `$resource_type` argument.
*
* @param int $object_id Optional. The ID of the object. Default 0.
* @param string $object_type Optional. The type of object for which we'll be retrieving
* ancestors. Accepts a post type or a taxonomy name. Default empty.
* @param string $resource_type Optional. Type of resource $object_type is. Accepts 'post_type'
* or 'taxonomy'. Default empty.
* @return array An array of ancestors from lowest to highest in the hierarchy.
*/
function get_ancestors( $object_id = 0, $object_type = '', $resource_type = '' ) {
$object_id = (int) $object_id;

$ancestors = array();

if ( empty( $object_id ) ) {

/** This filter is documented in wp-includes/taxonomy.php */
return apply_filters( 'get_ancestors', $ancestors, $object_id, $object_type, $resource_type );
}

if ( ! $resource_type ) {
if ( is_taxonomy_hierarchical( $object_type ) ) {
$resource_type = 'taxonomy';
} elseif ( post_type_exists( $object_type ) ) {
$resource_type = 'post_type';
}
}

if ( 'taxonomy' === $resource_type ) {
$term = get_term($object_id, $object_type);
while ( ! is_wp_error($term) && ! empty( $term->parent ) && ! in_array( $term->parent, $ancestors ) ) {
$ancestors[] = (int) $term->parent;
$term = get_term($term->parent, $object_type);
}
} elseif ( 'post_type' === $resource_type ) {
$ancestors = get_post_ancestors($object_id);
}

/**
* Filter a given object's ancestors.
*
* @since 3.1.0
* @since 4.1.1 Introduced the `$resource_type` parameter.
*
* @param array $ancestors An array of object ancestors.
* @param int $object_id Object ID.
* @param string $object_type Type of object.
* @param string $resource_type Type of resource $object_type is.
*/
return apply_filters( 'get_ancestors', $ancestors, $object_id, $object_type, $resource_type );
}