get_sorted_and_selected_categories( $post_id ); } /** * Render category options with optional indentation and selection from class properties. * * @since 8.2 * @param array $categories Array of category objects. * @param int $level Current indentation level. * @param bool $include_selected Whether to include the selected attribute. */ public function render_category_options_with_indent( $categories = null, $level = 0, $include_selected = true ) { $categories = $categories ? $categories : $this->sorted_categories; foreach ( $categories as $category ) { $indent = str_repeat( ' ', $level * 3 ); $selected = $include_selected && in_array( $category->term_id, $this->selected_categories ) ? ' selected' : ''; echo '' . esc_html( $indent . $category->name ) . ''; if ( ! empty( $category->children ) ) { $this->render_category_options_with_indent( $category->children, $level + 1, $include_selected ); } } } /** * Sort categories hierarchically. * * @since 8.2 * @param array $categories Array of category objects. * @param array $into Array to store sorted categories. * @param int $parent_id Parent category ID. */ public function sort_categories_hierarchically( array &$categories, array &$into, $parent_id = 0 ) { foreach ( $categories as $i => $category ) { if ( $category->parent === $parent_id ) { $into[ $category->term_id ] = $category; unset( $categories[ $i ] ); } } foreach ( $into as $top_category ) { $top_category->children = []; $this->sort_categories_hierarchically( $categories, $top_category->children, $top_category->term_id ); } } /** * Get sorted and selected categories for a post. * * @since 8.2 * @param int $post_id The ID of the post. */ public function get_sorted_and_selected_categories( $post_id ) { $categories = get_categories( [ 'taxonomy' => 'category', 'hide_empty' => false, ] ); $this->sort_categories_hierarchically( $categories, $this->sorted_categories ); $this->selected_categories = wp_get_post_categories( $post_id, [ 'fields' => 'ids' ] ); if ( ! is_array( $this->selected_categories ) ) { $this->selected_categories = []; } } }