//カスタム投稿
function my_custom_init() {
    $works_args = array(
      'public' => true,
      'label'  => 'Works',
      'show_in_rest' => true,
      'supports' => array( 'title','editor', 'thumbnail' ),
    );
    register_post_type( 'works', $works_args );
   
   $blog_args = array(
      'public' => true,
      'label'  => 'photo-blog',
      'show_in_rest' => true,
      'supports' => array( 'title','editor', 'thumbnail' ),
    );
    register_post_type( 'blog', $blog_args );
  
  $news_args = array(
      'public' => true,
      'label'  => 'news',
      'show_in_rest' => true,
      'supports' => array( 'title','editor', 'thumbnail' ),
    );
    register_post_type( 'news', $news_args );

}
add_action( 'init', 'my_custom_init' );