Get related terms by parent term with REST API

PHP
if(!class_exists('ODS_REST_API')){

  /**
   * 取得圖片主分類的關聯分類
   * 
   * 範例：取得國家 term id 773 的關聯地區
   * https://example.com/wp-json/ods/v1/area/773
   */
  
  class ODS_REST_API
  {
    private $related_area_data;

    /**
     * 
     */
    public function get_temrs_by_related( $request ) 
    {
      $related_area = get_field( 'country_related_area', $request['tax'].'_tax_'.$request['id']);
      foreach($related_area as $data) {
        $this->related_area_data[] = [
          'term_id' => $data->term_id,
          'name' => $data->name
        ];
      }
      if ( $related_area ) {
        return rest_ensure_response( $this->related_area_data );
      } else {
        return new WP_Error( 'rest_product_invalid', 'The term does not exist.', array( 'status' => 404 ) );
      }
      return new WP_Error( 'rest_api_sad', 'Something went horribly wrong.', array( 'status' => 500 ) );
    }
    
    /**
     * 
     */
    public function register_terms_route()
    {
      register_rest_route( 'ods/v1', '/(?<tax>[a-z]+)/(?P<id>[\d]+)', array(
          'methods'  => WP_REST_Server::READABLE,
          'callback' => array($this,'get_temrs_by_related'),
      ));
    }
  }
}

$term_route = new ODS_REST_API();
add_action( 'rest_api_init', array( $term_route, 'register_terms_route') );

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Send variables to template

// in archive, taxonomy
<?php $tax = 'news_tax'; ?>
<ul class="uk-margin-medium-bottom uk-margin-medium-top uk-grid-match uk-child-width-1-3@m uk-child-width-1-2@s uk-grid-small" uk-grid="">
  <?php while($i->have_posts()): $i->the_post(); ?>
  <?php if($i->current_post > 0): ?>
  <!-- <loopCardPrimary>-->
  <?php set_query_var('tax', $tax); ?>
  <?php echo get_template_part('partials/loops/card-primary'); ?>
  <!-- </loopCardPrimary>-->
  <?php endif; ?>
  <?php endwhile; wp_reset_postdata(); ?>
</ul>
    
// in loop template
<?php $tax = get_query_var('tax'); ?>

Register custom taxonomy in array

PHP
function add_post_taxonomy() {

  $taxArray = array(
    array(
      "taxName" => 'tax中文名',
      "taxNameEn" =>'taxSlu'
    ),
  );

  foreach ($taxArray as $tax) {
    $labels = array(
      "name" => __( "", "" ),
      "singular_name" => __( $tax['taxName'], "" ),
      "menu_name" => __( $tax['taxName'], "" ),
      "all_items" => __( "所有", "" ),
      "edit_item" => __( "編輯", "" ),
      "view_item" => __( "檢視", "" ),
      "update_item" => __( "更新", "" ),
      "add_new_item" => __( "新增", "" ),
      "new_item_name" => __( "新增", "" ),
      "search_items" => __( "搜尋", "" ),
    );

    $args = array(
      "label" => __( $tax['taxName'], "" ),
      "labels" => $labels,
      "public" => true,
      "hierarchical" => true,
      "label" => $tax['taxName'],
      "show_ui" => true,
      "show_in_menu" => true,
      "show_in_nav_menus" => true,
      "show_admin_column" => true,
      "query_var" => true,
      "rewrite" => array( 'slug' => $tax['taxNameEn'], 'with_front' => true, ),
      "show_admin_column" => true,
      "show_in_rest" => false,
      "rest_base" => $tax['taxNameEn'],
      "show_in_quick_edit" => true,
    );
    register_taxonomy( $tax['taxNameEn'], 'post', $args );
  }
  
}
add_action( 'init', 'add_post_taxonomy' );

Get current term

PHP
global $wp_query;
$term = $wp_query->get_queried_object();

Query the taxonomy terms by ACF field

PHP
<?php 
  $args = array(
    'taxonomy' => 'category',
    'hide_empty' => false
  );
  $cats = get_categories($args);
  $cats_has_feature = array();
  foreach($cats as $cat){
    if (get_field('term_is_feature', 'category_'.$cat->term_id)) {
      $cats_has_feature[] = $cat;	// save the match term in Array
    }
  }

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