●html-forms.php

if ( !function_exists( 'generate_info_list_tag' ) ):
function generate_info_list_tag($atts){
  extract(shortcode_atts(array(
    'count' => 5,
    'cats' => array(),
    'caption' => __( '新着情報', THEME_NAME ),
    'frame' => 1,
    'divider' => 1,
    'modified' => 0,
    'offset' => 0,
    'action' => null,
    'post_type' => 'post',
    'taxonomy' => 'category',
  ), $atts));

  $args = array(
    'post_type' => $post_type,
    'no_found_rows' => true,
    'ignore_sticky_posts' => true,
    'posts_per_page' => $count,
    'offset' => $offset,
    'action' => $action,
  );

  // 更新日順
  if ($modified) {
    $args['orderby'] = 'modified';
  }

  // インデックス除外カテゴリー
  $exclude_category_ids = get_archive_exclude_category_ids();
  if ($exclude_category_ids && is_array($exclude_category_ids)) {
    $args['category__not_in'] = $exclude_category_ids;
  }

  // 投稿編集のその他設定「アーカイブに出力しない」を除外
  $exclude_post_ids = get_archive_exclude_post_ids();
  if ($exclude_post_ids && is_array($exclude_post_ids)) {
    $args['post__not_in'] = $exclude_post_ids;
  }

  /* カテゴリーの指定 */
  if ($cats !== 'all') {
    $terms = is_array($cats) ? $cats : explode(',', $cats);

    $terms = array_map('intval', $terms);

    $args['tax_query'] = array(
      array(
        'taxonomy' => $taxonomy,
        'field'    => 'term_id',
        'terms'    => $terms,
      )
    );
  }

  $args = apply_filters( 'get_info_list_args', $args );
  $query = new WP_Query( $args );
  $frame_class = ($frame ? ' is-style-frame-border' : '');
  $divider_class = ($divider ? ' is-style-divider-line' : '');
  if( $query->have_posts() ): ?>
    <div id="info-list" class="info-list<?php echo $frame_class; ?><?php echo $divider_class; ?>">
      <?php if ($caption): ?>
        <div class="info-list-caption"><?php echo esc_html($caption); ?></div>
      <?php endif; ?>
      <?php while ($query->have_posts()) : $query->the_post();
        $date = get_the_time(get_site_date_format());
        $update_date = get_update_time(get_site_date_format());
        if ($modified && $update_date) {
          $date = $update_date;
        }
      ?>
        <div class="info-list-item">
          <div class="info-list-item-content"><a href="<?php the_permalink(); ?>" class="info-list-item-content-link"><?php the_title();?></a></div>
          <?php do_action('info_list_item_meta_before'); ?>
          <div class="info-list-item-meta">
            <span class="info-list-item-date"><?php echo $date; ?></span>
            <span class="info-list-item-categorys"><?php the_nolink_categories($taxonomy) ?></span>
          </div>
        </div>
      <?php endwhile; ?>
    </div>
  <?php else :
    echo '<p>'.__( '記事は見つかりませんでした。', THEME_NAME ).'</p>';
  endif;
  wp_reset_postdata();
}
endif;



●shortcodes.php
add_shortcode('info_list', 'get_info_list_shortcode');
if ( !function_exists( 'get_info_list_shortcode' ) ):
function get_info_list_shortcode($atts){
  extract(shortcode_atts(array(
    'count' => 5,
    'cats' => 'all',
    'caption' => __( '新着情報', THEME_NAME ),
    'frame' => 1,
    'divider' => 1,
    'modified' => 0,
    'offset' => 0,
    'action' => null,
    'post_type' => 'post',
    'taxonomy' => 'category',
  ), $atts, 'info_list'));

  //countオプションに異常値が入っていた場合
  if (!is_numeric($count) || (is_numeric($count) && (intval($count)) <= 0)) {
    $count = 5;
  }

  //カテゴリーを配列化
  $cat_ids = array();
  if ($cats && $cats != 'all') {
    $cat_ids = explode(',', $cats);
  }

  $atts = array(
    'count' => $count,
    'cats' => $cat_ids,
    'caption' => $caption,
    'frame' => $frame,
    'divider' => $divider,
    'modified' => $modified,
    'offset' => $offset,
    'action' => $action,
    'post_type' => $post_type,
    'taxonomy' => $taxonomy,
  );
  ob_start();
  generate_info_list_tag($atts);
  $tag = ob_get_clean();

  return apply_filters('get_info_list_tag', $tag);
}
endif;


●utils.php
if ( !function_exists( 'the_nolink_categories' ) ):
function the_nolink_categories($taxonomy = 'category'){
  echo get_the_nolink_categories($taxonomy);
}
endif;



if ( !function_exists( 'get_the_nolink_categories' ) ) :
function get_the_nolink_categories($taxonomy) {
  $categories = null;

  // タクソノミーのオブジェクトを取得
  $taxonomy_obj = get_taxonomy($taxonomy);

  // 階層型タクソノミーでない場合
  if ($taxonomy_obj && !$taxonomy_obj->hierarchical) {
    return $categories;
  }

  // 指定されたタクソノミーのタームを取得
  $terms = get_the_terms(get_the_ID(), $taxonomy);

  if ($terms && !is_wp_error($terms)) {
    // ターム名をA-Zにソート
    usort($terms, function($a, $b) {
      return strcmp($a->name, $b->name);
    });
    
    foreach ($terms as $term) {
      $id = $term->term_id;
      $classes = array(
        'entry-category',
        'cat-label-' . $id,
      );
      $classes = apply_filters('nolink_category_label_classes', $classes, $term);
      $implode_class = implode(' ', $classes);
      $categories .= '<span class="' . $implode_class . '">' . $term->name . '</span>';
    }
  }
  
  return $categories;
}
endif;