Bulk Duplicate Posts and Pages as Drafts

$wpide_bulk_dup_types = array( 'post', 'page' );

foreach ( $wpide_bulk_dup_types as $wpide_type ) {
    add_filter( "bulk_actions-edit-{$wpide_type}", function ( $actions ) {
        $actions['wpide_duplicate'] = 'Duplicate as draft';
        return $actions;
    } );

    add_filter( "handle_bulk_actions-edit-{$wpide_type}", function ( $redirect, $action, $post_ids ) {
        if ( 'wpide_duplicate' !== $action ) {
            return $redirect;
        }

        $done = 0;
        foreach ( $post_ids as $post_id ) {
            $post = get_post( $post_id );
            if ( ! $post || ! current_user_can( 'edit_post', $post_id ) ) {
                continue;
            }

            $new_id = wp_insert_post( wp_slash( array(
                'post_type'      => $post->post_type,
                'post_status'    => 'draft',
                'post_title'     => $post->post_title . ' (Copy)',
                'post_content'   => $post->post_content,
                'post_excerpt'   => $post->post_excerpt,
                'post_parent'    => $post->post_parent,
                'menu_order'     => $post->menu_order,
                'post_password'  => $post->post_password,
                'comment_status' => $post->comment_status,
                'ping_status'    => $post->ping_status,
                'post_author'    => get_current_user_id(),
            ) ), true );

            if ( is_wp_error( $new_id ) ) {
                continue;
            }

            foreach ( get_object_taxonomies( $post->post_type ) as $taxonomy ) {
                wp_set_object_terms( $new_id, wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'ids' ) ), $taxonomy );
            }
            foreach ( get_post_meta( $post_id ) as $key => $values ) {
                if ( in_array( $key, array( '_edit_lock', '_edit_last', '_wp_old_slug' ), true ) ) {
                    continue;
                }
                foreach ( $values as $value ) {
                    add_post_meta( $new_id, $key, wp_slash( maybe_unserialize( $value ) ) );
                }
            }
            $done++;
        }

        return add_query_arg( 'wpide_duplicated', $done, $redirect );
    }, 10, 3 );
}

add_action( 'admin_notices', function () {
    if ( ! empty( $_GET['wpide_duplicated'] ) ) {
        printf( '<div class="notice notice-success is-dismissible"><p>Created %d draft copies.</p></div>', absint( $_GET['wpide_duplicated'] ) );
    }
} );