<?php
/**
 * File description for WordPress functionality.
 *
 * @package WordPress
 * @since 3.0.0
 * @uses Category_To_Id_Array_Walker
 */

if ( ! class_exists( 'Category_To_Id_Array_Walker' ) ) {
	/**
	 * Category_To_Id_Array_Walker
	 */
	class Category_To_Id_Array_Walker extends Walker {

		/**
		 * Type of tree structure used for organizing content.
		 *
		 * This property defines the type of tree structure used for organizing content. It determines whether the structure is based on categories, tags, or custom taxonomy.
		 *
		 * @var string
		 */
		public $tree_type = 'category';

		/**
		 * Database fields mapping for the tree structure.
		 *
		 * This property defines the mapping of database fields used for building the tree structure. It specifies which database columns correspond to the parent and the ID of tree nodes.
		 *
		 * @var array
		 */
		public $db_fields = array(
			'parent' => 'parent',
			'id'     => 'term_id',
		);

		/**
		 * An array buffer used to store data while processing.
		 *
		 * This property is used to store data temporarily during processing. It allows for efficient storage and retrieval of data for various operations.
		 *
		 * @var array
		 */
		public $array_buffer = array();

		/**
		 * Start_lvl
		 *
		 * @param string  $output values here for the function.
		 * @param integer $depth values here for the function.
		 * @param array   $args values here for the function.
		 * @return void
		 */
		public function start_lvl( &$output, $depth = 0, $args = array() ) {
		}

		/**
		 * Snd_lvl
		 *
		 * @param string  $output values here for the function.
		 * @param integer $depth values here for the function.
		 * @param array   $args values here for the function.
		 * @return void
		 */
		public function end_lvl( &$output, $depth = 0, $args = array() ) {
		}

		/**
		 * Start the element output for a category in the menu walker.
		 *
		 * This method is responsible for generating the output for a category element in the menu walker.
		 *
		 * @see Walker_Nav_Menu::start_el()
		 *
		 * @since 3.0.0
		 *
		 * @param string $output   Passed by reference. Used to append additional content.
		 * @param object $category  Category data object.
		 * @param int    $depth        Depth of the category in the hierarchy. Used for padding.
		 * @param object $args      An array of arguments for generating the category item.
		 * @param int    $id           ID of the category.
		 */
		public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
			$this->array_buffer[ str_repeat( ' - ', $depth ) . $category->name . ' - [ id: ' . $category->term_id . ' ]' ] = $category->term_id;
		}

		/**
		 * Snd_el
		 *
		 * @param string  $output values here for the function.
		 * @param string  $page values here for the function.
		 * @param integer $depth values here for the function.
		 * @param array   $args values here for the function.
		 * @return void
		 */
		public function end_el( &$output, $page, $depth = 0, $args = array() ) {
		}
	}
}
