Make WordPress Duplicate Page, Post, and CPTs with a Code Snippet

Making a WordPress duplicate page, post, or custom post type can be streamlined with a simple yet effective technique: using a code snippet. This tutorial introduces a straightforward method to duplicate WordPress content without the need for additional plugins, making your website management more efficient and clutter-free.

Prerequisites

Please make sure you have the following installed and activated:

• Code Snippets

Why Use a Code Snippet and Not a Plugin

Using a code snippet reduces reliance on multiple plugins, which can improve site performance and minimize potential compatibility issues. This method is particularly useful for web developers and WordPress site managers who prefer a more streamlined, code-centric approach to site management.

WordPress Duplicate Page, Post, and CPTs Instructions

1. Navigate to the Snippets > Add New.
2. Title your new snippet for easy identification, e.g., ‘Duplicates’.
   
3. Copy and Paste the provided code snippet into the code box:

   /**
    * Duplicate WordPress Posts, Pages, and Custom Post Types as Drafts
    *
    * This code snippet enables the duplication of WordPress posts, pages, and all registered custom post types (CPTs).
    * It adds a 'Duplicate' link to the row actions for each item in the admin dashboard. When clicked, this link
    * triggers the duplication of the selected item, creating a new draft with the same content, custom fields,
    * and taxonomies.
    *
    * Functions:
    * 1. `duplicate_post_as_draft`: Handles the duplication process. It copies the post data, including title,
    *    content, excerpt, and custom fields, and creates a new post with a 'draft' status. It also maintains
    *    the taxonomy terms (like categories and tags) from the original post.
    * 2. `duplicate_post_link`: Adds the 'Duplicate' action link to the WordPress admin interface for each post,
    *    page, and custom post type. This link uses WordPress's built-in nonce functionality for security.
    * 3. `apply_duplicate_post_link_to_cpts`: Dynamically applies the duplicate post link function to all public
    *    post types, ensuring the 'Duplicate' link appears for any custom post types registered on the site.
    *
    * Author: Mark Harris
    * URI: https://www.christchurchwebsolutions.co.uk
    */
   
   function duplicate_post_as_draft() {
       global $wpdb;
   
       // Verify the nonce for security
       $nonce_action = 'duplicate_post_as_draft';
       $nonce_name = 'duplicate_nonce';
       if (!isset($_GET[$nonce_name]) || !wp_verify_nonce($_GET[$nonce_name], $nonce_action)) {
           wp_die(esc_html__('Security check failed.', 'wpturbo'));
       }
   
       // Check if the 'post' parameter is set in either GET or POST request
       $post_id = filter_input(INPUT_GET, 'post', FILTER_SANITIZE_NUMBER_INT) ?: filter_input(INPUT_POST, 'post', FILTER_SANITIZE_NUMBER_INT);
   
       if (!$post_id) {
           wp_die(esc_html__('No post to duplicate has been supplied!', 'wpturbo'));
       }
   
       // Check if the post exists
       $post = get_post($post_id);
       if (!$post) {
           wp_die(esc_html(sprintf(__('Post creation failed, could not find original post: %s', 'wpturbo'), $post_id)));
       }
   
       $current_user = wp_get_current_user();
       $new_post_author = $current_user->ID;
   
       $args = [
           "comment_status" => $post->comment_status,
           "ping_status" => $post->ping_status,
           "post_author" => $new_post_author,
           "post_content" => $post->post_content,
           "post_excerpt" => $post->post_excerpt,
           "post_name" => $post->post_name,
           "post_parent" => $post->post_parent,
           "post_password" => $post->post_password,
           "post_status" => "draft",
           "post_title" => $post->post_title . " (Copy)",
           "post_type" => $post->post_type,
           "to_ping" => $post->to_ping,
           "menu_order" => $post->menu_order
       ];
   
       $new_post_id = wp_insert_post($args);
   
       $taxonomies = get_object_taxonomies($post->post_type);
       foreach ($taxonomies as $taxonomy) {
           $post_terms = wp_get_object_terms($post_id, $taxonomy, ["fields" => "slugs"]);
           wp_set_object_terms($new_post_id, $post_terms, $taxonomy, false);
       }
   
       $post_meta_infos = $wpdb->get_results(
           $wpdb->prepare("SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id = %d", $post_id)
       );
       if (count($post_meta_infos) != 0) {
           foreach ($post_meta_infos as $meta_info) {
               $meta_key = $meta_info->meta_key;
               $meta_value = sanitize_meta($meta_info->meta_key, $meta_info->meta_value, "post");
               $wpdb->insert($wpdb->postmeta, [
                   "post_id" => $new_post_id,
                   "meta_key" => $meta_key,
                   "meta_value" => $meta_value
               ]);
           }
       }
   
       // Redirect to the post list screen and show a success message
       $redirect_url = admin_url("edit.php?post_type=" . $post->post_type);
       wp_redirect(add_query_arg("message", "101", $redirect_url));
       exit();
   }
   
   add_action("admin_action_duplicate_post_as_draft", "duplicate_post_as_draft");
   
   function duplicate_post_link($actions, $post) {
       if (current_user_can('edit_posts')) {
           $actions['duplicate'] = '<a href="' . 
               wp_nonce_url(
                   admin_url("admin.php?action=duplicate_post_as_draft&post=" . $post->ID), 
                   'duplicate_post_as_draft', 
                   'duplicate_nonce'
               ) . 
               '" title="' . esc_attr__('Duplicate this item', 'wpturbo') . 
               '" rel="permalink">' . esc_html__('Duplicate', 'wpturbo') . '</a>';
       }
       return $actions;
   }
   
   add_filter("post_row_actions", "duplicate_post_link", 10, 2);
   add_filter("page_row_actions", "duplicate_post_link", 10, 2);
   
   function apply_duplicate_post_link_to_cpts() {
       $post_types = get_post_types(["public" => true], "names");
       foreach ($post_types as $post_type) {
           add_filter("{$post_type}_row_actions", "duplicate_post_link", 10, 2);
       }
   }
   
   add_action("admin_init", "apply_duplicate_post_link_to_cpts");
   
   function show_duplicate_admin_notice() {
       if (isset($_GET['message']) && $_GET['message'] === '101') {
           echo '<div class="notice notice-success is-dismissible"><p>' . esc_html('Post duplicated successfully.') . '</p></div>';
       }
   }
   
   add_action('admin_notices', 'show_duplicate_admin_notice');

   Source: Code Snippets Cloud

4. Save Changes and Activate the snippet.
   
5. Verify by going to your pages list, you should now see a ‘Duplicate’ option.
   

Official Documentation

• Code Snippets Documentation

WordPress Duplicate Page, Post, CPT – Conclusion

This tutorial outlined a simple yet effective method to duplicate pages, posts, and custom post types in WordPress. By utilizing the Code Snippets plugin and a specific code snippet, you can streamline your content management process, keeping your WordPress site organized and efficient.