Bulk clone solution

Hi Attached in a piece of code I use for bulk clone of a post type called “class_schedule”

You can remove that post_type check to use it everywhere. I did not made the class, just implemented it to the plugin for a client site.

/**
 * Timersys - www.timersys.com
 * Add the option to bulk clone a set of posts. Thanks to:
 *     https://www.foxrunsoftware.net/articles/wordpress/add-custom-bulk-action/
 *	Copyright: ? 2012 Justin Stern (email : [email protected])
 *	License: GNU General Public License v3.0
 *	License URI: https://www.gnu.org/licenses/gpl-3.0.html
*/

if (!class_exists('FRS_Custom_Bulk_Action')) {

	class FRS_Custom_Bulk_Action {

		public function __construct() {

			if(is_admin()) {
				// admin actions/filters
				add_action('admin_footer-edit.php', array(&$this, 'custom_bulk_admin_footer'));
				add_action('load-edit.php',         array(&$this, 'custom_bulk_action'));
				add_action('admin_notices',         array(&$this, 'custom_bulk_admin_notices'));
			}
		}

		/**
		 * Step 1: add the custom Bulk Action to the select menus
		 */
		function custom_bulk_admin_footer() {
			global $post_type;

			if($post_type == 'class_schedule') {
				?>
					<script type="text/javascript">
						jQuery(document).ready(function() {
							jQuery('<option>').val('clone').text('<?php _e('Clone')?>').appendTo("select[name='action']");
							jQuery('<option>').val('clone').text('<?php _e('Clone')?>').appendTo("select[name='action2']");
						});
					</script>
				<?php
	    	}
		}

		/**
		 * Step 2: handle the custom Bulk Action
		 *
		 * Based on the post https://wordpress.stackexchange.com/questions/29822/custom-bulk-action
		 */
		function custom_bulk_action() {
			global $typenow;
			$post_type = $typenow;

			if($post_type == 'class_schedule') {

				// get the action
				$wp_list_table = _get_list_table('WP_Posts_List_Table');  // depending on your resource type this could be WP_Users_List_Table, WP_Comments_List_Table, etc
				$action = $wp_list_table->current_action();

				$allowed_actions = array("clone");
				if(!in_array($action, $allowed_actions)) return;

				// security check
				check_admin_referer('bulk-posts');

				// make sure ids are submitted.  depending on the resource type, this may be 'media' or 'ids'
				if(isset($_REQUEST['post'])) {
					$post_ids = array_map('intval', $_REQUEST['post']);
				}

				if(empty($post_ids)) return;

				// this is based on wp-admin/edit.php
				$sendback = remove_query_arg( array('cloned', 'untrashed', 'deleted', 'ids'), wp_get_referer() );
				if ( ! $sendback )
					$sendback = admin_url( "edit.php?post_type=$post_type" );

				$pagenum = $wp_list_table->get_pagenum();
				$sendback = add_query_arg( 'paged', $pagenum, $sendback );

				switch($action) {
					case 'clone':

						// if we set up user permissions/capabilities, the code might look like:
						//if ( !current_user_can($post_type_object->cap->export_post, $post_id) )
						//	wp_die( __('You are not allowed to export this post.') );

						$exported = 0;
						foreach( $post_ids as $post_id ) {

							if ( !$this->perform_export($post_id) )
								wp_die( __('Error Cloning post.') );

							$exported++;
						}

						$sendback = add_query_arg( array('cloned' => $exported, 'ids' => join(',', $post_ids) ), $sendback );
					break;

					default: return;
				}

				$sendback = remove_query_arg( array('action', 'action2', 'tags_input', 'post_author', 'comment_status', 'ping_status', '_status',  'post', 'bulk_edit', 'post_view'), $sendback );

				wp_redirect($sendback);
				exit();
			}
		}

		/**
		 * Step 3: display an admin notice on the Posts page after exporting
		 */
		function custom_bulk_admin_notices() {
			global $post_type, $pagenow;

			if($pagenow == 'edit.php' && $post_type == 'class_schedule' && isset($_REQUEST['cloned']) && (int) $_REQUEST['cloned']) {
				$message = sprintf( _n( 'Classes cloned.', '%s classes cloned.', $_REQUEST['cloned'] ), number_format_i18n( $_REQUEST['cloned'] ) );
				echo "<div class=\"updated\"><p>{$message}</p></div>";
			}
		}

		function perform_export($post_id) {
			// do whatever work needs to be done

			$post = get_post($post_id);
			duplicate_post_create_duplicate($post);
			return true;
		}
	}
}

new FRS_Custom_Bulk_Action();
?>

https://www.ads-software.com/plugins/duplicate-post/