1. Write API READABLE Category Order (chưa có permission_callback)

https://app.gitbook.com/@wordpress-lionel/s/project/api-mot-vi-du-ve-tuy-chinh-route-full-ok

<?php
class Lionel_Category_List_Rest extends WP_REST_Controller {
  protected $namespace;
  protected $rest_base;
  public function __construct() {
    $this->namespace = 'categorylist/v2';
    $this->rest_base = 'order';
  }
  public function register_routes() {
    register_rest_route($this->namespace, '/' . $this->rest_base, array(
      array(
        'methods'  => WP_REST_Server::READABLE,
        'callback' => array($this, 'get_items')
      ),
      'schema' => null,
    ));
  }
  public function get_items($request) {
    $cat_order = get_option('category_order');
    $data      = get_categories();
    $res       = [];
    if ($cat_order) {
      $index = 0;
      foreach ($cat_order as $cat) {
        $temp          = [];
        $temp['name']  = get_cat_name($cat);
        $temp['id']    = $cat;
        $temp['order'] = $index;
        $res[]         = $temp;
        $index++;
      }
    } elseif (!empty($data)) {
      $index = 0;
      foreach ($data as $list) {
        if ('category' === $list->taxonomy) {
          $temp          = [];
          $temp['name']  = $list->name;
          $temp['id']    = $list->term_id;
          $temp['order'] = $index;
          $res[]         = $temp;
          $index++;
        }
      }
    }
    // Return all of our comment response data.
    return rest_ensure_response($res);
  }
}
function register_cat_list_controller() {
  $controller = new Lionel_Category_List_Rest();
  $controller->register_routes();
}
add_action('rest_api_init', 'register_cat_list_controller');
?>