CPT Plugin

cpt-nested.php

<?php
/*
Plugin Name: WI Verbs Nested Post Types
Plugin URI:  https://wisconsinverbs.com
Description: Display Custom Post Types in a nested menu
Version:     1.0
Author:      Andrea Roenning
Author URI:  https://andrearoenning.com
License:     GPL2
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: wiverb
*/

if(!function_exists('wiverb_post_types')) {
  /**
   * Adds custom post types
   */
  function wiverb_post_types() {
    global $wp_rewrite;

    /*
    * Hiking Trail listing 
    */
    register_post_type( 'wiverb_hike',
      array(
        'labels' => array(
          'name' => __( 'Hiking Trails' ),
          'singular_name' => __( 'Hiking Trail' ),
          'add_new_item' => __('Add New Trail'),
          'edit_item' => __('Edit Trail'),
          'new_item' => __('New trail'),
          'view_item' => __('View trail'),
          'search_items' => __('Search trails'),
          'not_found' => __('No trails were found'),
          'not_found_in_trash' => ('No trails found in trash')
        ),
        'public' => true,
        'show_in_menu' => false,
        'exclude_from_search' => true,
        'supports' => array('title', 'editor', 'thumbnail', 'revisions', 'page-attributes'),
        'rewrite' => array( 'slug' => 'trails/hiking' ),
        'has_archive' => 'trails/hiking'
      )
    );
    
    /*
    * Biking Trail listing 
    */
    register_post_type( 'wiverb_bike',
      array(
        'labels' => array(
          'name' => __( 'Biking Trails' ),
          'singular_name' => __( 'Biking Trail' ),
          'add_new_item' => __('Add New Trail'),
          'edit_item' => __('Edit Trail'),
          'new_item' => __('New trail'),
          'view_item' => __('View trail'),
          'search_items' => __('Search trails'),
          'not_found' => __('No trails were found'),
          'not_found_in_trash' => ('No trails found in trash')
        ),
        'public' => true,
        'show_in_menu' => false,
        'exclude_from_search' => true,
        'supports' => array('title', 'editor', 'thumbnail', 'revisions', 'page-attributes'),
        'rewrite' => array( 'slug' => 'trails/biking' ),
        'has_archive' => 'trails/biking'
      )
    );  
  }
  add_action( 'init', 'wiverb_post_types' );
}


/*
* Admin Controls
*/

if(!function_exists('wiverbs_trails_menu')) {
  /**
   * Adds admin nav & subnav
   */
  function wiverbs_trails_menu() {
    add_menu_page( 'Trails', 'Trails', 'edit_posts', 'wiverbs_trails', 'wiverbs_trails_page', 'dashicons-location-alt', 5 );
    
    add_submenu_page('wiverbs_trails', 'Hiking Trails', 'Hiking Trails', 'edit_posts', 'edit.php?post_type=wiverb_hike');
    
    add_submenu_page('wiverbs_trails', 'Biking Trails', 'Biking Trails', 'edit_posts', 'edit.php?post_type=wiverb_bike');
  }
  add_action( 'admin_menu', 'wiverbs_trails_menu' );
}

if(!function_exists('wiverbs_trails_page')) {
  /**
   * Add content to the admin trails top-level page
   */
  function wiverbs_trails_page() {
    if ( !current_user_can( 'edit_posts' ) )  {
      wp_die( __( 'You do not have sufficient permissions to access this page.' ) );
    }
    echo '<div class="wrap">';
    echo '<h2>Trails</h2><p>Edit trails by selecting from the list below';
    echo '<ul>'; 
    echo '<li><a href="'. home_url() .'/wp-admin/edit.php?post_type=wiverb_hike">Hiking Trails</a></li>';
    echo '<li><a href="'. home_url() .'/wp-admin/edit.php?post_type=wiverb_bike">Biking Trails</a></li>';
    echo '</ul>';
    echo '</div>';
  }
}