カスタム投稿タイプをfunctions.phpだけで作成する方法

function create_news_post_type() {
  register_post_type( ‘news’, array(
    ‘label’ => ‘お知らせ’,
    ‘public’ => true,
    ‘has_archive’ => true,
  ));
}
add_action( ‘init’, ‘create_news_post_type’ );

function create_news_post_type() {
  register_post_type( ‘news’, array(
    ‘labels’ => array(
      ‘name’ => ‘お知らせ’,
      ‘singular_name’ => ‘お知らせ’,
      ‘add_new’ => ‘新規追加’,
      ‘add_new_item’ => ‘お知らせを追加’,
      ‘edit_item’ => ‘お知らせを編集’,
      ‘view_item’ => ‘お知らせを表示’,
      ‘search_items’ => ‘お知らせを検索’,
      ‘not_found’ => ‘お知らせが見つかりません’,
    ),
    ‘public’ => true,
    ‘has_archive’ => true,
    ‘menu_position’ => 5,
    ‘menu_icon’ => ‘dashicons-megaphone’,
    ‘supports’ => array(
      ‘title’, ‘editor’, ‘thumbnail’, ‘excerpt’, ‘custom-fields’, ‘revisions’
    ),
    ‘show_in_rest’ => true,
  ));
}
add_action( ‘init’, ‘create_news_post_type’ );

register_taxonomy( ‘news-cat’, ‘news’, array(
  ‘labels’ => array(
    ‘name’ => ‘お知らせカテゴリー’,
    ‘add_new_item’ => ‘カテゴリーを追加’,
    ‘edit_item’ => ‘カテゴリーを編集’,
    ‘search_items’ => ‘カテゴリーを検索’,
  ),
  ‘public’ => true,
  ‘hierarchical’ => true,
  ‘show_in_rest’ => true,
));

register_taxonomy( ‘news-tag’, ‘news’, array(
  ‘labels’ => array(
    ‘name’ => ‘お知らせタグ’,
    ‘add_new_item’ => ‘タグを追加’,
    ‘edit_item’ => ‘タグを編集’,
    ‘search_items’ => ‘タグを検索’,
  ),
  ‘public’ => true,
  ‘hierarchical’ => false,
  ‘show_in_rest’ => true,
));

function create_news_post_type() {
  // カスタム投稿タイプの登録
  register_post_type( ‘news’, array(
    ‘labels’ => array(
      ‘name’ => ‘お知らせ’,
      ‘singular_name’ => ‘お知らせ’,
      ‘add_new’ => ‘新規追加’,
      ‘add_new_item’ => ‘お知らせを追加’,
      ‘edit_item’ => ‘お知らせを編集’,
      ‘view_item’ => ‘お知らせを表示’,
      ‘search_items’ => ‘お知らせを検索’,
      ‘not_found’ => ‘お知らせが見つかりません’,
    ),
    ‘public’ => true,
    ‘has_archive’ => true,
    ‘menu_position’ => 5,
    ‘menu_icon’ => ‘dashicons-megaphone’,
    ‘supports’ => array(
      ‘title’, ‘editor’, ‘thumbnail’, ‘excerpt’, ‘revisions’
    ),
    ‘show_in_rest’ => true,
  ));

  // カスタムタクソノミー（カテゴリー）の登録
  register_taxonomy( ‘news-cat’, ‘news’, array(
    ‘labels’ => array(
      ‘name’ => ‘お知らせカテゴリー’,
      ‘add_new_item’ => ‘カテゴリーを追加’,
      ‘edit_item’ => ‘カテゴリーを編集’,
    ),
    ‘public’ => true,
    ‘hierarchical’ => true,
    ‘show_in_rest’ => true,
  ));
}
add_action( ‘init’, ‘create_news_post_type’ );

<?php
$args = array(
  ‘post_type’ => ‘news’,
  ‘post_status’ => ‘publish’,
  ‘posts_per_page’ => 5,
);
$news_query = new WP_Query( $args );

if ( $news_query->have_posts() ) :
  while ( $news_query->have_posts() ) : $news_query->the_post();
?>
  <article>
    <time><?php echo get_the_date(); ?></time>
    <h3><a href=”<?php the_permalink(); ?>”><?php the_title(); ?></a></h3>
  </article>
<?php
  endwhile;
  wp_reset_postdata();
endif;
?>