dominikbulaj
3/23/2016 - 12:25 PM

Closure that runs recursively to get all parent category IDs (incl. given category ID) or parent page IDs (incl. provided page object's ID)

Closure that runs recursively to get all parent category IDs (incl. given category ID) or parent page IDs (incl. provided page object's ID)

Page.php
content_copyfile_download
/**
 * @param WP_Post $page
 * @return array
 */
$getParentPageIds = function($page) use (&$getParentPageIds) {
    $parents = [$page->ID];

    if ($page->post_parent > 0) {
        $parentPage = get_post($page->post_parent);
        $parents = array_merge($parents, $getParentPageIds($parentPage));
    }

    return $parents;
};

// usage
$page = get_post(99);
$getParentPageIds($page); // returns array with example values: 99, 32, 1
Category.php
content_copyfile_download
/**
 * @param int $id
 * @return array
 */
$getParentCategoryId = function($id) use (&$getParentCategoryId) {
    $catIds = [$id];

    $category = get_category($id);
    if ($category->category_parent > 0) {
        $catIds = array_merge($catIds, $getParentCategoryId($category->category_parent));
    }

    return $catIds;
};

// usage
$getParentCategoryId(99); // returns array with example values: 99, 91, 62, 4